diff --git a/composer.json b/composer.json
index 69617f6..3507573 100644
--- a/composer.json
+++ b/composer.json
@@ -16,12 +16,12 @@
   "type": "project",
   "require": {
     "php": ">=7.1",
-    "league/uri": "^5.3",
+    "league/uri": "5.3.0",
     "ext-curl": "*",
     "ext-zlib": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "6.*",
+    "phpunit/phpunit": "6.5.14",
     "phpstan/phpstan": "0.12.99"
   },
   "autoload": {