diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/AccessControlPrivilegeListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/AccessControlPrivilegeListCommand.php
index 87fe2fd..1ff9173 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/AccessControlPrivilegeListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/AccessControlPrivilegeListCommand.php
@@ -21,7 +21,7 @@
 
 class AccessControlPrivilegeListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('access-control:privilege:list');
         $this->setDescription('List the privileges of the repository or a specific node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockInfoCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockInfoCommand.php
index 1d5f1a2..63cf038 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockInfoCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockInfoCommand.php
@@ -20,7 +20,7 @@
 
 class LockInfoCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:info');
         $this->setDescription('Show details of the lock that applies to the specified node path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockLockCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockLockCommand.php
index 83b9d5d..82a32bd 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockLockCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockLockCommand.php
@@ -20,7 +20,7 @@
 
 class LockLockCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:lock');
         $this->setDescription('Lock the node at the given path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockRefreshCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockRefreshCommand.php
index 804bdd6..4eebc49 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockRefreshCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockRefreshCommand.php
@@ -19,7 +19,7 @@
 
 class LockRefreshCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:refresh');
         $this->setDescription('Refresh the TTL of the lock of the node at the given path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenAddCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenAddCommand.php
index 5130726..fe9d977 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenAddCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenAddCommand.php
@@ -19,7 +19,7 @@
 
 class LockTokenAddCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:token:add');
         $this->setDescription('Add a lock token to the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenListCommand.php
index 4bf3171..798df96 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenListCommand.php
@@ -19,7 +19,7 @@
 
 class LockTokenListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:token:list');
         $this->setDescription('List a lock token to the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenRemoveCommand.php
index b73d393..f46b19f 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockTokenRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class LockTokenRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:token:remove');
         $this->setDescription('Remove a lock token to the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/LockUnlockCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/LockUnlockCommand.php
index 34fd1f9..17b57cf 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/LockUnlockCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/LockUnlockCommand.php
@@ -19,7 +19,7 @@
 
 class LockUnlockCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('lock:unlock');
         $this->setDescription('Unlock the node at the given path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCloneCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCloneCommand.php
index 37fcde2..3321e21 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCloneCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCloneCommand.php
@@ -19,7 +19,7 @@
 
 class NodeCloneCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:clone');
         $this->setDescription('Clone a node (immediate)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCopyCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCopyCommand.php
index d6b77a2..d61a3f6 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCopyCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCopyCommand.php
@@ -18,7 +18,7 @@
 
 class NodeCopyCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:copy');
         $this->setDescription('Copy a node (immediate)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCorrespondingCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCorrespondingCommand.php
index baa7033..e962a3b 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCorrespondingCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCorrespondingCommand.php
@@ -18,7 +18,7 @@
 
 class NodeCorrespondingCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:corresponding');
         $this->setDescription('Show the path for the current nodes corresponding path in named workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCreateCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCreateCommand.php
index 686fac0..95a82c1 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeCreateCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeCreateCommand.php
@@ -18,7 +18,7 @@
 
 class NodeCreateCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:create');
         $this->setDescription('Create a node at the current path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeEditCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeEditCommand.php
index 2492ba2..44a3c4b 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeEditCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeEditCommand.php
@@ -25,7 +25,7 @@
 
 class NodeEditCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:edit');
         $this->setDescription('Edit the given node in the EDITOR configured by the system');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeFileImportCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeFileImportCommand.php
index 39cebde..95a170c 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeFileImportCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeFileImportCommand.php
@@ -26,7 +26,7 @@ class NodeFileImportCommand extends BasePhpcrCommand
      */
     protected $session;
 
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('file:import');
         $this->setDescription('Import a file at the given path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeInfoCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeInfoCommand.php
index 396819d..bb4404c 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeInfoCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeInfoCommand.php
@@ -19,7 +19,7 @@
 
 class NodeInfoCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:info');
         $this->setDescription('Show information about the current node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleFollowCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleFollowCommand.php
index 575197e..03955f0 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleFollowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleFollowCommand.php
@@ -19,7 +19,7 @@
 
 class NodeLifecycleFollowCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:lifecycle:follow');
         $this->setDescription('Causes the lifecycle state of this node to undergo the specified transition.');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleListCommand.php
index 749f8f9..5be8e00 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeLifecycleListCommand.php
@@ -19,7 +19,7 @@
 
 class NodeLifecycleListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:lifecycle:list');
         $this->setDescription('Returns the list of valid state transitions for this node.');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeListCommand.php
index 57c3e9f..beff4ad 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeListCommand.php
@@ -33,7 +33,7 @@ class NodeListCommand extends BasePhpcrCommand
     protected $nbNodes = 0;
     protected $nbProperties = 0;
 
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:list');
         $this->setDescription('List the children / properties of this node at the given path or with the given UUID');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinAddCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinAddCommand.php
index d156676..1a8484f 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinAddCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinAddCommand.php
@@ -18,7 +18,7 @@
 
 class NodeMixinAddCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:mixin:add');
         $this->setDescription('Add the named mixin to the node (can include wildcards)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinRemoveCommand.php
index 41abd7c..31e1acc 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMixinRemoveCommand.php
@@ -18,7 +18,7 @@
 
 class NodeMixinRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:mixin:remove');
         $this->setDescription('Remove the named mixin to the current node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMoveCommand.php
index b2af8fd..c42d101 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeMoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeMoveCommand.php
@@ -18,7 +18,7 @@
 
 class NodeMoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:move');
         $this->setDescription('Move a node in the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeOrderBeforeCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeOrderBeforeCommand.php
index 7b140c1..2273478 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeOrderBeforeCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeOrderBeforeCommand.php
@@ -18,7 +18,7 @@
 
 class NodeOrderBeforeCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:order-before');
         $this->setDescription('Reorder a child node of the current node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyRemoveCommand.php
index f682418..73a5992 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class NodePropertyRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:property:remove');
         $this->setDescription('Remove the property at the given absolute path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertySetCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertySetCommand.php
index 3b29daa..0cd56db 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertySetCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertySetCommand.php
@@ -22,7 +22,7 @@
 
 class NodePropertySetCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:property:set');
         $this->setDescription('Rename the node at the current path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyShowCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyShowCommand.php
index 5e95623..ee69a35 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyShowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodePropertyShowCommand.php
@@ -19,7 +19,7 @@
 
 class NodePropertyShowCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:property:show');
         $this->setDescription('Show the property at the given path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeReferencesCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeReferencesCommand.php
index 5231485..f6716c9 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeReferencesCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeReferencesCommand.php
@@ -19,7 +19,7 @@
 
 class NodeReferencesCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:references');
         $this->setDescription('Returns all REFERENCE properties that refer to this node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeRemoveCommand.php
index 51bf1d1..2ccf764 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class NodeRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:remove');
         $this->setDescription('Remove the node at path (can include wildcards)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeRenameCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeRenameCommand.php
index 5331554..5c6603e 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeRenameCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeRenameCommand.php
@@ -18,7 +18,7 @@
 
 class NodeRenameCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:rename');
         $this->setDescription('Rename the node at the current path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeSetPrimaryTypeCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeSetPrimaryTypeCommand.php
index 209335c..e1cadad 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeSetPrimaryTypeCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeSetPrimaryTypeCommand.php
@@ -18,7 +18,7 @@
 
 class NodeSetPrimaryTypeCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:set-primary-type');
         $this->setDescription('Set the primary type of the current node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeSharedShowCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeSharedShowCommand.php
index 1467da1..a05b6e4 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeSharedShowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeSharedShowCommand.php
@@ -19,7 +19,7 @@
 
 class NodeSharedShowCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:shared:show');
         $this->setDescription('Show all the nodes are in the shared set of this node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeEditCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeEditCommand.php
index 7762f88..4ca7f7c 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeEditCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeEditCommand.php
@@ -22,7 +22,7 @@
 
 class NodeTypeEditCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node-type:edit');
         $this->setDescription('Edit or create a node type');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeListCommand.php
index 0300ec1..f073e51 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeListCommand.php
@@ -19,7 +19,7 @@
 
 class NodeTypeListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node-type:list');
         $this->setDescription('List registered node types');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeLoadCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeLoadCommand.php
index f14d5fd..62fd465 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeLoadCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeLoadCommand.php
@@ -19,7 +19,7 @@
 
 class NodeTypeLoadCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node-type:load');
         $this->setDescription('Load or create a node type');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeShowCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeShowCommand.php
index 0e60efa..bc724cf 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeShowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeShowCommand.php
@@ -20,7 +20,7 @@
 
 class NodeTypeShowCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node-type:show');
         $this->setDescription('Show the CND of a node type');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeUnregisterCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeUnregisterCommand.php
index 7e7cf64..d4bd38d 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeUnregisterCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeTypeUnregisterCommand.php
@@ -18,7 +18,7 @@
 
 class NodeTypeUnregisterCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node-type:unregister');
         $this->setDescription('Unregister a node type UNSUPPORTED / TODO');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/NodeUpdateCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/NodeUpdateCommand.php
index dc44a32..d425f05 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/NodeUpdateCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/NodeUpdateCommand.php
@@ -18,7 +18,7 @@
 
 class NodeUpdateCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('node:update');
         $this->setDescription('Updates a node corresponding to the given path in the given workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/QueryCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/QueryCommand.php
index f7cdce1..2058599 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/QueryCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/QueryCommand.php
@@ -19,7 +19,7 @@
 
 class QueryCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('query');
         $this->setDescription('Execute a SELECT query (advanced)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/QueryDeleteCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/QueryDeleteCommand.php
index 8ad7be4..485c819 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/QueryDeleteCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/QueryDeleteCommand.php
@@ -18,7 +18,7 @@
 
 class QueryDeleteCommand extends BaseQueryCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('delete');
         $this->setDescription('Execute a DELETE query (non standard)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/QuerySelectCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/QuerySelectCommand.php
index 1645ab8..35aca72 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/QuerySelectCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/QuerySelectCommand.php
@@ -17,7 +17,7 @@
 
 class QuerySelectCommand extends BaseQueryCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('select');
         $this->setDescription('Execute a SELECT query (JCR-SQL2)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/QueryUpdateCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/QueryUpdateCommand.php
index 206bc7d..825c94b 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/QueryUpdateCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/QueryUpdateCommand.php
@@ -23,7 +23,7 @@ class QueryUpdateCommand extends BaseQueryCommand
      */
     protected $output;
 
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('update');
         $this->setDescription('Execute an UPDATE query (non-standard)');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RepositoryDescriptorListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RepositoryDescriptorListCommand.php
index 13cfe16..13bedbe 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RepositoryDescriptorListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RepositoryDescriptorListCommand.php
@@ -18,7 +18,7 @@
 
 class RepositoryDescriptorListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('repository:descriptor:list');
         $this->setDescription('List the descriptors for the current repository');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldAddCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldAddCommand.php
index c8ba74f..b7f57cf 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldAddCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldAddCommand.php
@@ -20,7 +20,7 @@
 
 class RetentionHoldAddCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('retention:hold:add');
         $this->setDescription('Adds a retention hold UNSUPPORTED');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldListCommand.php
index 4b221c0..ea0ac3e 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldListCommand.php
@@ -20,7 +20,7 @@
 
 class RetentionHoldListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('retention:hold:list');
         $this->setDescription('List retention holds at given absolute path UNSUPPORTED');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldRemoveCommand.php
index adfecdb..3e69710 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionHoldRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class RetentionHoldRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('retention:hold:remove');
         $this->setDescription('Removes a retention hold UNSUPPORTED');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyGetCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyGetCommand.php
index 4ca0654..155f217 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyGetCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyGetCommand.php
@@ -19,7 +19,7 @@
 
 class RetentionPolicyGetCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('retention:policy:get');
         $this->setDescription('Get a retention policy for specified node UNSUPPORTED');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyRemoveCommand.php
index da7a614..8530d9c 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/RetentionPolicyRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class RetentionPolicyRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('retention:policy:remove');
         $this->setDescription('Remove a retention policy for specified node UNSUPPORTED');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionExportCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionExportCommand.php
index e1684c5..937604c 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionExportCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionExportCommand.php
@@ -21,7 +21,7 @@
 
 class SessionExportCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:export');
         $this->setDescription('Export the session to XML');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionImpersonateCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionImpersonateCommand.php
index e8073fc..75049ec 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionImpersonateCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionImpersonateCommand.php
@@ -19,7 +19,7 @@
 
 class SessionImpersonateCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:impersonate');
         $this->setDescription('Impersonate the given user');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionImportCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionImportCommand.php
index d5f1fcf..81ca54b 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionImportCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionImportCommand.php
@@ -27,7 +27,7 @@ class SessionImportCommand extends BasePhpcrCommand
         'collision-throw',
     ];
 
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:import');
         $this->setDescription('Import content from an XML file');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionInfoCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionInfoCommand.php
index e0ea54b..67d9ee5 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionInfoCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionInfoCommand.php
@@ -18,7 +18,7 @@
 
 class SessionInfoCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:info');
         $this->setDescription('Display information about current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionLoginCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionLoginCommand.php
index e05b19d..6b683ee 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionLoginCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionLoginCommand.php
@@ -18,7 +18,7 @@
 
 class SessionLoginCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:login');
         $this->setDescription('Login or (relogin) to a session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionLogoutCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionLogoutCommand.php
index afb3e49..85f102a 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionLogoutCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionLogoutCommand.php
@@ -17,7 +17,7 @@
 
 class SessionLogoutCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:logout');
         $this->setDescription('Logout of the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceListCommand.php
index 844caa0..077d3a9 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceListCommand.php
@@ -18,7 +18,7 @@
 
 class SessionNamespaceListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:namespace:list');
         $this->setDescription('List all namespace prefix to URI  mappings in current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceSetCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceSetCommand.php
index 0e8d2b6..a777aaf 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceSetCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionNamespaceSetCommand.php
@@ -18,7 +18,7 @@
 
 class SessionNamespaceSetCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:namespace:set');
         $this->setDescription('Set a namespace in the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionRefreshCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionRefreshCommand.php
index 2e17781..bc97166 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionRefreshCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionRefreshCommand.php
@@ -18,7 +18,7 @@
 
 class SessionRefreshCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:refresh');
         $this->setDescription('Refresh the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/SessionSaveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/SessionSaveCommand.php
index 0ff5de3..a4268c9 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/SessionSaveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/SessionSaveCommand.php
@@ -17,7 +17,7 @@
 
 class SessionSaveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('session:save');
         $this->setDescription('Save the current session');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckinCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckinCommand.php
index 807c517..d431241 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckinCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckinCommand.php
@@ -19,7 +19,7 @@
 
 class VersionCheckinCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:checkin');
         $this->setDescription('Checkin (commit) a node version');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckoutCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckoutCommand.php
index 0f7d421..2278434 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckoutCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckoutCommand.php
@@ -19,7 +19,7 @@
 
 class VersionCheckoutCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:checkout');
         $this->setDescription('Checkout a node version and enable changes to be made');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckpointCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckpointCommand.php
index c907b21..ba30f8b 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckpointCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionCheckpointCommand.php
@@ -19,7 +19,7 @@
 
 class VersionCheckpointCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:checkpoint');
         $this->setDescription('Checkin and then checkout a node');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionHistoryCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionHistoryCommand.php
index 66cad49..788c962 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionHistoryCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionHistoryCommand.php
@@ -20,7 +20,7 @@
 
 class VersionHistoryCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:history');
         $this->setDescription('Show version history of node at given absolute path');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionRemoveCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionRemoveCommand.php
index e32fc7f..74542f7 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionRemoveCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionRemoveCommand.php
@@ -19,7 +19,7 @@
 
 class VersionRemoveCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:remove');
         $this->setDescription('Remove a node version');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/VersionRestoreCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/VersionRestoreCommand.php
index 77fb22d..64ec130 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/VersionRestoreCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/VersionRestoreCommand.php
@@ -20,7 +20,7 @@
 
 class VersionRestoreCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('version:restore');
         $this->setDescription('Restore a node version');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceCreateCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceCreateCommand.php
index 48c133c..94ae45d 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceCreateCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceCreateCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceCreateCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:create');
         $this->setDescription('Create a new workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceDeleteCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceDeleteCommand.php
index d9f315c..3914f77 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceDeleteCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceDeleteCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceDeleteCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:delete');
         $this->setDescription('Delete a workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceListCommand.php
index 8712dd8..11f7dc5 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceListCommand.php
@@ -19,7 +19,7 @@
 
 class WorkspaceListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:list');
         $this->setDescription('Lists workspaces in the current repository');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceListCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceListCommand.php
index 7afd24f..33c48df 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceListCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceNamespaceListCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:namespace:list');
         $this->setDescription('List all namespace prefix to URI  mappings in current workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceRegisterCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceRegisterCommand.php
index fa5ed1f..8cc0ac1 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceRegisterCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceRegisterCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceNamespaceRegisterCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:namespace:register');
         $this->setDescription('Sets a one-to-one mapping between prefix and uri in the global namespace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceUnregisterCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceUnregisterCommand.php
index 2dfc11e..e9d1de6 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceUnregisterCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceNamespaceUnregisterCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceNamespaceUnregisterCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:namespace:unregister');
         $this->setDescription('Unregister a namespace');
diff --git a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceUseCommand.php b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceUseCommand.php
index f16e155..91718be 100644
--- a/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceUseCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Phpcr/WorkspaceUseCommand.php
@@ -18,7 +18,7 @@
 
 class WorkspaceUseCommand extends BasePhpcrCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('workspace:use');
         $this->setDescription('Change the current workspace');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/AliasListCommand.php b/src/PHPCR/Shell/Console/Command/Shell/AliasListCommand.php
index 1e9e756..39484f3 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/AliasListCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/AliasListCommand.php
@@ -19,7 +19,7 @@
 
 class AliasListCommand extends BaseCommand
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:alias:list');
         $this->setDescription('List all the registered aliases');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/ClearCommand.php b/src/PHPCR/Shell/Console/Command/Shell/ClearCommand.php
index 114d7e5..73742ec 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/ClearCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/ClearCommand.php
@@ -18,7 +18,7 @@
 
 class ClearCommand extends BaseCommand
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:clear');
         $this->setDescription('Clear the screen');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/ConfigInitCommand.php b/src/PHPCR/Shell/Console/Command/Shell/ConfigInitCommand.php
index 8da9c7d..2f910e4 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/ConfigInitCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/ConfigInitCommand.php
@@ -20,7 +20,7 @@ class ConfigInitCommand extends BaseCommand
 {
     protected $output;
 
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:config:init');
         $this->setDescription('Initialize a local configuration with default values');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/ConfigReloadCommand.php b/src/PHPCR/Shell/Console/Command/Shell/ConfigReloadCommand.php
index 06c3f30..b8d7346 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/ConfigReloadCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/ConfigReloadCommand.php
@@ -20,7 +20,7 @@ class ConfigReloadCommand extends BaseCommand
 {
     protected $output;
 
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:config:reload');
         $this->setDescription('Reload the configuration');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/ExitCommand.php b/src/PHPCR/Shell/Console/Command/Shell/ExitCommand.php
index d500d6f..14beb31 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/ExitCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/ExitCommand.php
@@ -19,7 +19,7 @@
 
 class ExitCommand extends BaseCommand
 {
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:exit');
         $this->setDescription('Logout and quit the shell');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/PathChangeCommand.php b/src/PHPCR/Shell/Console/Command/Shell/PathChangeCommand.php
index fe9f3a4..57d4a89 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/PathChangeCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/PathChangeCommand.php
@@ -19,7 +19,7 @@
 
 class PathChangeCommand extends BaseCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('shell:path:change');
         $this->setDescription('Change the current path');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/PathShowCommand.php b/src/PHPCR/Shell/Console/Command/Shell/PathShowCommand.php
index f4287c5..81c3ccd 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/PathShowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/PathShowCommand.php
@@ -18,7 +18,7 @@
 
 class PathShowCommand extends BaseCommand
 {
-    protected function configure()
+    protected function configure(): void
     {
         $this->setName('shell:path:show');
         $this->setDescription('Print Working Directory (or path)');
diff --git a/src/PHPCR/Shell/Console/Command/Shell/ProfileShowCommand.php b/src/PHPCR/Shell/Console/Command/Shell/ProfileShowCommand.php
index 0bdcb2c..73e1c0e 100644
--- a/src/PHPCR/Shell/Console/Command/Shell/ProfileShowCommand.php
+++ b/src/PHPCR/Shell/Console/Command/Shell/ProfileShowCommand.php
@@ -21,7 +21,7 @@ class ProfileShowCommand extends BaseCommand
 {
     protected $output;
 
-    public function configure()
+    public function configure(): void
     {
         $this->setName('shell:profile:show');
         $this->setDescription('Show the current profile configuration');
diff --git a/src/PHPCR/Shell/Console/Command/ShellCommand.php b/src/PHPCR/Shell/Console/Command/ShellCommand.php
index 7e419b3..341f986 100644
--- a/src/PHPCR/Shell/Console/Command/ShellCommand.php
+++ b/src/PHPCR/Shell/Console/Command/ShellCommand.php
@@ -49,7 +49,7 @@ public function __construct(ShellApplication $application)
     /**
      * {@inheritdoc}
      */
-    public function configure()
+    public function configure(): void
     {
         $this->setName('phpcr_shell');
         $this->setDefinition([