diff --git a/composer.json b/composer.json
index 28271fd..89132f3 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "slim/slim": "3.x-dev"
+        "slim/slim": "^3.0"
     },
     "autoload": {
         "psr-4": {