diff --git a/composer.json b/composer.json
index 8912769..bf5a7d9 100644
--- a/composer.json
+++ b/composer.json
@@ -24,9 +24,9 @@
         "php": ">=7"
     },
     "require-dev": {
-        "phpunit/phpunit": "~5",
-        "squizlabs/php_codesniffer": "~2",
-        "orchestra/testbench": "~3.0"
+        "phpunit/phpunit": "5.7.27",
+        "squizlabs/php_codesniffer": "2.9.2",
+        "orchestra/testbench": "3.9.4"
     },
     "autoload": {
         "psr-4": {