diff --git a/composer.json b/composer.json
index 55fc53e..f6e99a4 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
         "php": ">=5.5.0",
 
         "pimple/pimple":                       "^3.0",
-        "container-interop/container-interop": "~1.1.0"
+        "container-interop/container-interop": "^1.1.0"
     },
 
     "require-dev": {