diff --git a/.evergreen/config/generated/build/build-php-7.4.yml b/.evergreen/config/generated/build/build-php-7.4.yml
index 713be9d40..f9ea50615 100644
--- a/.evergreen/config/generated/build/build-php-7.4.yml
+++ b/.evergreen/config/generated/build/build-php-7.4.yml
@@ -7,6 +7,9 @@ tasks:
         vars:
           PHP_VERSION: "7.4"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-7.4-lowest"
     tags: ["build", "php7.4", "lowest"]
@@ -16,7 +19,9 @@ tasks:
           PHP_VERSION: "7.4"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-7.4-next-stable"
     tags: ["build", "php7.4", "next-stable"]
@@ -26,7 +31,9 @@ tasks:
           PHP_VERSION: "7.4"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-7.4-next-minor"
     tags: ["build", "php7.4", "next-minor"]
diff --git a/.evergreen/config/generated/build/build-php-8.0.yml b/.evergreen/config/generated/build/build-php-8.0.yml
index c69691a59..9b971466c 100644
--- a/.evergreen/config/generated/build/build-php-8.0.yml
+++ b/.evergreen/config/generated/build/build-php-8.0.yml
@@ -7,6 +7,9 @@ tasks:
         vars:
           PHP_VERSION: "8.0"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.0-lowest"
     tags: ["build", "php8.0", "lowest"]
@@ -16,7 +19,9 @@ tasks:
           PHP_VERSION: "8.0"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.0-next-stable"
     tags: ["build", "php8.0", "next-stable"]
@@ -26,7 +31,9 @@ tasks:
           PHP_VERSION: "8.0"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.0-next-minor"
     tags: ["build", "php8.0", "next-minor"]
diff --git a/.evergreen/config/generated/build/build-php-8.1.yml b/.evergreen/config/generated/build/build-php-8.1.yml
index 42e2bdbcc..d0eeb3350 100644
--- a/.evergreen/config/generated/build/build-php-8.1.yml
+++ b/.evergreen/config/generated/build/build-php-8.1.yml
@@ -7,6 +7,9 @@ tasks:
         vars:
           PHP_VERSION: "8.1"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.1-lowest"
     tags: ["build", "php8.1", "lowest"]
@@ -16,7 +19,9 @@ tasks:
           PHP_VERSION: "8.1"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.1-next-stable"
     tags: ["build", "php8.1", "next-stable"]
@@ -26,7 +31,9 @@ tasks:
           PHP_VERSION: "8.1"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.1-next-minor"
     tags: ["build", "php8.1", "next-minor"]
diff --git a/.evergreen/config/generated/build/build-php-8.2.yml b/.evergreen/config/generated/build/build-php-8.2.yml
index 756245940..1c18dc746 100644
--- a/.evergreen/config/generated/build/build-php-8.2.yml
+++ b/.evergreen/config/generated/build/build-php-8.2.yml
@@ -7,6 +7,9 @@ tasks:
         vars:
           PHP_VERSION: "8.2"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.2-lowest"
     tags: ["build", "php8.2", "lowest"]
@@ -16,7 +19,9 @@ tasks:
           PHP_VERSION: "8.2"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.2-next-stable"
     tags: ["build", "php8.2", "next-stable"]
@@ -26,7 +31,9 @@ tasks:
           PHP_VERSION: "8.2"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.2-next-minor"
     tags: ["build", "php8.2", "next-minor"]
diff --git a/.evergreen/config/generated/build/build-php-8.3.yml b/.evergreen/config/generated/build/build-php-8.3.yml
index 1be1779fe..108a0983b 100644
--- a/.evergreen/config/generated/build/build-php-8.3.yml
+++ b/.evergreen/config/generated/build/build-php-8.3.yml
@@ -7,6 +7,9 @@ tasks:
         vars:
           PHP_VERSION: "8.3"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.3-lowest"
     tags: ["build", "php8.3", "lowest"]
@@ -16,7 +19,9 @@ tasks:
           PHP_VERSION: "8.3"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.3-next-stable"
     tags: ["build", "php8.3", "next-stable"]
@@ -26,7 +31,9 @@ tasks:
           PHP_VERSION: "8.3"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-8.3-next-minor"
     tags: ["build", "php8.3", "next-minor"]
diff --git a/.evergreen/config/templates/build/build-extension.yml b/.evergreen/config/templates/build/build-extension.yml
index 04946be87..140b0a5d0 100644
--- a/.evergreen/config/templates/build/build-extension.yml
+++ b/.evergreen/config/templates/build/build-extension.yml
@@ -6,6 +6,9 @@ tasks:
         vars:
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
+        vars:
+          # TODO: remove this 1.18.0 is released
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-lowest"
     tags: ["build", "php%phpVersion%", "lowest"]
@@ -15,7 +18,9 @@ tasks:
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
         vars:
-         EXTENSION_VERSION: "1.17.0"
+          # TODO: change to "1.18.0" once 1.18.0 is released
+          # EXTENSION_VERSION: "1.18.0"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-next-stable"
     tags: ["build", "php%phpVersion%", "next-stable"]
@@ -25,7 +30,9 @@ tasks:
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
         vars:
-          EXTENSION_BRANCH: "v1.17"
+          # TODO: change to "v1.18" once 1.18.0 is released
+          # EXTENSION_VERSION: "v1.18"
+          EXTENSION_BRANCH: "master"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-next-minor"
     tags: ["build", "php%phpVersion%", "next-minor"]
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 97fa36a33..e49ca886d 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -19,7 +19,9 @@ on:
 
 env:
   PHP_VERSION: "8.2"
-  DRIVER_VERSION: "stable"
+  # TODO: change to "stable" once 1.18.0 is released
+  # DRIVER_VERSION: "stable"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
 
 jobs:
   phpcs:
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 320804bd3..a321cce1e 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -19,7 +19,9 @@ on:
 
 env:
   PHP_VERSION: "8.2"
-  DRIVER_VERSION: "stable"
+  # TODO: change to "stable" once 1.18.0 is released
+  # DRIVER_VERSION: "stable"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
 
 jobs:
   psalm:
@@ -35,7 +37,7 @@ jobs:
         uses: shivammathur/cache-extensions@v1
         with:
           php-version: ${{ env.PHP_VERSION }}
-          extensions: "mongodb-${{ ENV.DRIVER_VERSION }}"
+          extensions: "mongodb-${{ env.DRIVER_VERSION }}"
           key: "extcache-v1"
 
       - name: Cache extensions
@@ -49,7 +51,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          extensions: "mongodb-${{ ENV.DRIVER_VERSION }}"
+          extensions: "mongodb-${{ env.DRIVER_VERSION }}"
           php-version: "${{ env.PHP_VERSION }}"
           tools: "cs2pr"
 
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fbeae4576..3b36b457b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,6 +17,11 @@ on:
     paths-ignore:
       - "docs/**"
 
+env:
+  # TODO: change to "stable" once 1.18.0 is released
+  # DRIVER_VERSION: "stable"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
+
 jobs:
   phpunit:
     name: "PHPUnit tests"
@@ -36,34 +41,34 @@ jobs:
         mongodb-version:
           - "4.4"
         driver-version:
-          - "stable"
+          - "${{ env.DRIVER_VERSION }}"
         topology:
           - "server"
         include:
           - os: "ubuntu-20.04"
             php-version: "8.0"
             mongodb-version: "6.0"
-            driver-version: "stable"
+            driver-version: "${{ env.DRIVER_VERSION }}"
             topology: "replica_set"
           - os: "ubuntu-20.04"
             php-version: "8.0"
             mongodb-version: "6.0"
-            driver-version: "stable"
+            driver-version: "${{ env.DRIVER_VERSION }}"
             topology: "sharded_cluster"
           - os: "ubuntu-20.04"
             php-version: "8.0"
             mongodb-version: "5.0"
-            driver-version: "stable"
+            driver-version: "${{ env.DRIVER_VERSION }}"
             topology: "server"
           - os: "ubuntu-20.04"
             php-version: "8.0"
             mongodb-version: "4.4"
-            driver-version: "stable"
+            driver-version: "${{ env.DRIVER_VERSION }}"
             topology: "replica_set"
           - os: "ubuntu-20.04"
             php-version: "8.0"
             mongodb-version: "4.4"
-            driver-version: "stable"
+            driver-version: "${{ env.DRIVER_VERSION }}"
             topology: "sharded_cluster"
 
     steps:
diff --git a/composer.json b/composer.json
index c8a1ea090..0a6a6503d 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "php": "^7.4 || ^8.0",
         "ext-hash": "*",
         "ext-json": "*",
-        "ext-mongodb": "^1.17.0",
+        "ext-mongodb": "^1.18.0",
         "jean85/pretty-package-versions": "^2.0.1",
         "psr/log": "^1.1.4|^2|^3",
         "symfony/polyfill-php80": "^1.27",
diff --git a/tests/UnifiedSpecTests/retryable-writes/insertOne-serverErrors.json b/tests/UnifiedSpecTests/retryable-writes/insertOne-serverErrors.json
index 0d0d639cd..89827fcf3 100644
--- a/tests/UnifiedSpecTests/retryable-writes/insertOne-serverErrors.json
+++ b/tests/UnifiedSpecTests/retryable-writes/insertOne-serverErrors.json
@@ -165,6 +165,309 @@
           ]
         }
       ]
+    },
+    {
+      "description": "RetryableWriteError label is added based on top-level code in pre-4.4 server response",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.2",
+          "maxServerVersion": "4.2.99",
+          "topologies": [
+            "replicaset",
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 2
+              },
+              "data": {
+                "failCommands": [
+                  "insert"
+                ],
+                "errorCode": 189
+              }
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 3,
+              "x": 33
+            }
+          },
+          "expectError": {
+            "errorLabelsContain": [
+              "RetryableWriteError"
+            ]
+          }
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client0",
+          "events": [
+            {
+              "commandStartedEvent": {
+                "command": {
+                  "insert": "coll",
+                  "documents": [
+                    {
+                      "_id": 3,
+                      "x": 33
+                    }
+                  ]
+                },
+                "commandName": "insert",
+                "databaseName": "retryable-writes-tests"
+              }
+            },
+            {
+              "commandStartedEvent": {
+                "command": {
+                  "insert": "coll",
+                  "documents": [
+                    {
+                      "_id": 3,
+                      "x": 33
+                    }
+                  ]
+                },
+                "commandName": "insert",
+                "databaseName": "retryable-writes-tests"
+              }
+            }
+          ]
+        }
+      ],
+      "outcome": [
+        {
+          "collectionName": "coll",
+          "databaseName": "retryable-writes-tests",
+          "documents": [
+            {
+              "_id": 1,
+              "x": 11
+            },
+            {
+              "_id": 2,
+              "x": 22
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "description": "RetryableWriteError label is added based on writeConcernError in pre-4.4 mongod response",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.2",
+          "maxServerVersion": "4.2.99",
+          "topologies": [
+            "replicaset"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 2
+              },
+              "data": {
+                "failCommands": [
+                  "insert"
+                ],
+                "writeConcernError": {
+                  "code": 91,
+                  "errmsg": "Replication is being shut down"
+                }
+              }
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 3,
+              "x": 33
+            }
+          },
+          "expectError": {
+            "errorLabelsContain": [
+              "RetryableWriteError"
+            ]
+          }
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client0",
+          "events": [
+            {
+              "commandStartedEvent": {
+                "command": {
+                  "insert": "coll",
+                  "documents": [
+                    {
+                      "_id": 3,
+                      "x": 33
+                    }
+                  ]
+                },
+                "commandName": "insert",
+                "databaseName": "retryable-writes-tests"
+              }
+            },
+            {
+              "commandStartedEvent": {
+                "command": {
+                  "insert": "coll",
+                  "documents": [
+                    {
+                      "_id": 3,
+                      "x": 33
+                    }
+                  ]
+                },
+                "commandName": "insert",
+                "databaseName": "retryable-writes-tests"
+              }
+            }
+          ]
+        }
+      ],
+      "outcome": [
+        {
+          "collectionName": "coll",
+          "databaseName": "retryable-writes-tests",
+          "documents": [
+            {
+              "_id": 1,
+              "x": 11
+            },
+            {
+              "_id": 2,
+              "x": 22
+            },
+            {
+              "_id": 3,
+              "x": 33
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "description": "RetryableWriteError label is not added based on writeConcernError in pre-4.4 mongos response",
+      "runOnRequirements": [
+        {
+          "minServerVersion": "4.2",
+          "maxServerVersion": "4.2.99",
+          "topologies": [
+            "sharded"
+          ]
+        }
+      ],
+      "operations": [
+        {
+          "name": "failPoint",
+          "object": "testRunner",
+          "arguments": {
+            "client": "client0",
+            "failPoint": {
+              "configureFailPoint": "failCommand",
+              "mode": {
+                "times": 1
+              },
+              "data": {
+                "failCommands": [
+                  "insert"
+                ],
+                "writeConcernError": {
+                  "code": 91,
+                  "errmsg": "Replication is being shut down"
+                }
+              }
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 3,
+              "x": 33
+            }
+          },
+          "expectError": {
+            "errorLabelsOmit": [
+              "RetryableWriteError"
+            ]
+          }
+        }
+      ],
+      "expectEvents": [
+        {
+          "client": "client0",
+          "events": [
+            {
+              "commandStartedEvent": {
+                "command": {
+                  "insert": "coll",
+                  "documents": [
+                    {
+                      "_id": 3,
+                      "x": 33
+                    }
+                  ]
+                },
+                "commandName": "insert",
+                "databaseName": "retryable-writes-tests"
+              }
+            }
+          ]
+        }
+      ],
+      "outcome": [
+        {
+          "collectionName": "coll",
+          "databaseName": "retryable-writes-tests",
+          "documents": [
+            {
+              "_id": 1,
+              "x": 11
+            },
+            {
+              "_id": 2,
+              "x": 22
+            },
+            {
+              "_id": 3,
+              "x": 33
+            }
+          ]
+        }
+      ]
     }
   ]
 }