diff --git a/composer.json b/composer.json
index fd40d25..7a88190 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "library",
     "require": {
         "php-64bit": "^7.2 || ^8.0",
-        "ext-pthreads": ">=3.1.7dev"
+        "ext-pthreads": "~3.2.0 || ^4.0"
     },
     "require-dev": {
         "phpstan/phpstan": "0.12.76",