diff --git a/composer.json b/composer.json
index 465cd36967c838e993cf4d93790869c97fffbe81..6d31be01107470de74c34edb4720d0f42706cb73 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,8 @@
     "ext-json": "*",
     "beberlei/assert": "^3.2",
     "friendsofphp/php-cs-fixer": "^2.13",
-    "symfony/cache": "^4.0"
+    "symfony/cache": "^4.0",
+    "symfony/cache-contracts": "^1.0"
   },
   "require-dev": {
     "irstea/composer-require-checker-shim": "^2.0.0",