diff --git a/composer.json b/composer.json
index f33f51f03..520853c72 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,6 @@
         "monolog/monolog": "~1.16",
         "nikic/php-parser": "^3 || ^4",
         "psr/container": "1.0.0",
-        "psr/container-implementation": "1.0.0",
         "silverstripe/config": "^1@dev",
         "silverstripe/assets": "^1@dev",
         "silverstripe/vendor-plugin": "^1.4",