diff --git a/composer.json b/composer.json
index 8026518..d6b413c 100644
--- a/composer.json
+++ b/composer.json
@@ -3,11 +3,11 @@
   "license": "MIT",
   "require": {
     "php": ">=7.0.0",
-    "bunny/bunny": "^0.4.1",
-    "hsldymq/whisper": "^0.1"
+    "bunny/bunny": "~0.4.1",
+    "hsldymq/whisper": "~0.3.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6.4"
+    "phpunit/phpunit": "~6.4.0"
   },
   "autoload": {
     "psr-4": {