diff --git a/composer.json b/composer.json
index 8c1333a..0f60a6e 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
 	},
 	"require" : {
 		"php" : ">=7.2",
-		"phootwork/collection" : "2.0@dev"
+		"phootwork/collection" : "^2.0"
 	},
 	"homepage" : "https://phootwork.github.io/json/"
 }
\ No newline at end of file