diff --git a/src/Symfony/Contracts/Cache/composer.json b/src/Symfony/Contracts/Cache/composer.json
index d5d7e99b9f..4e0bd1a422 100644
--- a/src/Symfony/Contracts/Cache/composer.json
+++ b/src/Symfony/Contracts/Cache/composer.json
@@ -16,10 +16,10 @@
         }
     ],
     "require": {
-        "php": "^7.1.3"
+        "php": "^7.1.3",
+        "psr/cache": "^1.0"
     },
     "suggest": {
-        "psr/cache": "",
         "symfony/cache-implementation": ""
     },
     "autoload": {
diff --git a/src/Symfony/Contracts/Service/composer.json b/src/Symfony/Contracts/Service/composer.json
index 54341174ce..f4209cc41c 100644
--- a/src/Symfony/Contracts/Service/composer.json
+++ b/src/Symfony/Contracts/Service/composer.json
@@ -16,10 +16,10 @@
         }
     ],
     "require": {
-        "php": "^7.1.3"
+        "php": "^7.1.3",
+        "psr/container": "^1.0"
     },
     "suggest": {
-        "psr/container": "",
         "symfony/service-implementation": ""
     },
     "autoload": {
diff --git a/src/Symfony/Contracts/composer.json b/src/Symfony/Contracts/composer.json
index f78ba697db..b9277e1dd1 100644
--- a/src/Symfony/Contracts/composer.json
+++ b/src/Symfony/Contracts/composer.json
@@ -16,11 +16,11 @@
         }
     ],
     "require": {
-        "php": "^7.1.3"
+        "php": "^7.1.3",
+        "psr/cache": "^1.0",
+        "psr/container": "^1.0"
     },
     "require-dev": {
-        "psr/cache": "^1.0",
-        "psr/container": "^1.0",
         "symfony/polyfill-intl-idn": "^1.10"
     },
     "replace": {
@@ -31,8 +31,6 @@
         "symfony/translation-contracts": "self.version"
     },
     "suggest": {
-        "psr/cache": "When using the Cache contracts",
-        "psr/container": "When using the Service contracts",
         "psr/event-dispatcher": "When using the EventDispatcher contracts",
         "symfony/cache-implementation": "",
         "symfony/event-dispatcher-implementation": "",