diff --git a/Package.swift b/Package.swift
index df47559..b0df52c 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.8
 //===----------------------------------------------------------------------===//
 //
 // This source file is part of the SwiftNIO open source project
diff --git a/docker/docker-compose.2004.56.yaml b/docker/docker-compose.2004.56.yaml
deleted file mode 100644
index 2a4ef3e..0000000
--- a/docker/docker-compose.2004.56.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-http-structured-headers:20.04-5.6
-    build:
-      args:
-        ubuntu_version: "focal"
-        swift_version: "5.6"
-
-  unit-tests:
-    image: swift-http-structured-headers:20.04-5.6
-
-  documentation-check:
-    image: swift-http-structured-headers:20.04-5.6
-
-  test:
-    image: swift-http-structured-headers:20.04-5.6
-
-  shell:
-    image: swift-http-structured-headers:20.04-5.6
-
diff --git a/docker/docker-compose.2204.510.yaml b/docker/docker-compose.2204.510.yaml
index 66c9c95..0186482 100644
--- a/docker/docker-compose.2204.510.yaml
+++ b/docker/docker-compose.2204.510.yaml
@@ -6,8 +6,8 @@ services:
     image: swift-http-structured-headers:22.04-5.10
     build:
       args:
-        base_image: "swiftlang/swift:nightly-5.10-jammy"
         ubuntu_version: "jammy"
+        swift_version: "5.10"
 
   unit-tests:
     image: swift-http-structured-headers:22.04-5.10
diff --git a/docker/docker-compose.2204.57.yaml b/docker/docker-compose.2204.57.yaml
deleted file mode 100644
index 3b34cf8..0000000
--- a/docker/docker-compose.2204.57.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-http-structured-headers:22.04-5.7
-    build:
-      args:
-        ubuntu_version: "jammy"
-        swift_version: "5.7"
-
-  unit-tests:
-    image: swift-http-structured-headers:22.04-5.7
-
-  documentation-check:
-    image: swift-http-structured-headers:22.04-5.7
-
-  test:
-    image: swift-http-structured-headers:22.04-5.7
-
-  shell:
-    image: swift-http-structured-headers:22.04-5.7
-