diff --git a/composer.json b/composer.json
index 0ebe0a11084478145130439d2a71f7671b63d3a9..78366208edbee23270b68a85c51252a99f83e461 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
   "license": "BSD-3-Clause",
   "require": {
     "php": ">=5.5.0",
-    "stanley-cheung/protobuf-php": "dev-master"
+    "stanley-cheung/protobuf-php": "v0.6"
   },
   "require-dev": {
     "google/auth": "v0.9"
diff --git a/src/php/composer.json b/src/php/composer.json
index 23bfcedbe6b820df765598749bdf904cf0d1d77e..88418206e82e628693e2d4aec1e40f46714b8d72 100644
--- a/src/php/composer.json
+++ b/src/php/composer.json
@@ -8,7 +8,7 @@
   "version": "1.0.0",
   "require": {
     "php": ">=5.5.0",
-    "stanley-cheung/protobuf-php": "dev-master",
+    "stanley-cheung/protobuf-php": "v0.6",
     "google/auth": "v0.9"
   },
   "autoload": {
diff --git a/templates/composer.json.template b/templates/composer.json.template
index 07ab1f20ebab21b2acc037ed9ac1ed2a732af81c..48d3b8892e203755e2cec8b6cced333b0f507c70 100644
--- a/templates/composer.json.template
+++ b/templates/composer.json.template
@@ -9,7 +9,7 @@
     "license": "BSD-3-Clause",
     "require": {
       "php": ">=5.5.0",
-      "stanley-cheung/protobuf-php": "dev-master"
+      "stanley-cheung/protobuf-php": "v0.6"
     },
     "require-dev": {
       "google/auth": "v0.9"