diff --git a/.gitmodules b/.gitmodules
index b2b112a0..ce2abc73 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,11 @@
 [submodule "test-server/ruby-v3-server/local-ruby-sdk"]
 	path = test-server/ruby-v3-server/local-ruby-sdk
 	url = git@github.com:aws/aws-sdk-ruby-staging.git
+[submodule "test-server/php-v2-server/local-php-sdk"]
+	path = test-server/php-v2-server/local-php-sdk
+	url = git@github.com:aws/private-aws-sdk-php-staging.git
+	branch = s3ec/transitional
+[submodule "test-server/php-v3-server/local-php-sdk"]
+	path = test-server/php-v3-server/local-php-sdk
+	url = git@github.com:aws/private-aws-sdk-php-staging.git
+	branch = s3ec/improved
diff --git a/test-server/php-v2-server/composer.json b/test-server/php-v2-server/composer.json
index e9c399ac..d5177951 100644
--- a/test-server/php-v2-server/composer.json
+++ b/test-server/php-v2-server/composer.json
@@ -3,9 +3,18 @@
     "description": "PHP v2 implementation of the S3EC Test Server framework",
     "type": "project",
     "license": "Apache-2.0",
+    "repositories": [
+        {
+            "type": "path",
+            "url": "./local-php-sdk",
+            "options": {
+                "symlink": true
+            }
+        }
+    ],
     "require": {
         "php": ">=7.4",
-        "aws/aws-sdk-php": "^3.356",
+        "aws/aws-sdk-php": "@dev",
         "ramsey/uuid": "^4.9"
     },
     "autoload": {
@@ -19,6 +28,9 @@
         ]
     },
     "config": {
-        "optimize-autoloader": true
+        "optimize-autoloader": true,
+        "platform": {
+            "php": "8.1"
+        }
     }
 }
\ No newline at end of file
diff --git a/test-server/php-v2-server/local-php-sdk b/test-server/php-v2-server/local-php-sdk
new file mode 160000
index 00000000..d78bd3b2
--- /dev/null
+++ b/test-server/php-v2-server/local-php-sdk
@@ -0,0 +1 @@
+Subproject commit d78bd3b221890aac679ec3b6cb5abcb01fd42699
diff --git a/test-server/php-v3-server/composer.json b/test-server/php-v3-server/composer.json
index 7ed1daf3..32c2b00c 100644
--- a/test-server/php-v3-server/composer.json
+++ b/test-server/php-v3-server/composer.json
@@ -1,11 +1,20 @@
 {
-    "name": "aws/s3ec-php-v2-test-server",
-    "description": "PHP v2 implementation of the S3EC Test Server framework",
+    "name": "aws/s3ec-php-v3-test-server",
+    "description": "PHP v3 implementation of the S3EC Test Server framework",
     "type": "project",
     "license": "Apache-2.0",
+    "repositories": [
+        {
+            "type": "path",
+            "url": "./local-php-sdk",
+            "options": {
+                "symlink": true
+            }
+        }
+    ],
     "require": {
         "php": ">=7.4",
-        "aws/aws-sdk-php": "^3.356",
+        "aws/aws-sdk-php": "@dev",
         "ramsey/uuid": "^4.9"
     },
     "autoload": {
@@ -19,6 +28,9 @@
         ]
     },
     "config": {
-        "optimize-autoloader": true
+        "optimize-autoloader": true,
+        "platform": {
+            "php": "8.1"
+        }
     }
 }
\ No newline at end of file
diff --git a/test-server/php-v3-server/local-php-sdk b/test-server/php-v3-server/local-php-sdk
new file mode 160000
index 00000000..d78bd3b2
--- /dev/null
+++ b/test-server/php-v3-server/local-php-sdk
@@ -0,0 +1 @@
+Subproject commit d78bd3b221890aac679ec3b6cb5abcb01fd42699