diff --git a/composer.json b/composer.json
index c2e17fb..f54a9b8 100644
--- a/composer.json
+++ b/composer.json
@@ -2,6 +2,6 @@
   "require": {
     "launchdarkly/server-sdk": ">=6.0",
     "guzzlehttp/guzzle": "7.*",
-    "kevinrob/guzzle-cache-middleware": "4.*"
+    "kevinrob/guzzle-cache-middleware": "^7.0"
   }
 }