diff --git a/dev-scripts/run_tests.bat b/dev-scripts/run_tests.bat
index a7b1eef..fff4913 100644
--- a/dev-scripts/run_tests.bat
+++ b/dev-scripts/run_tests.bat
@@ -21,7 +21,6 @@ set "script_dir=%~dp0"
 set "work_dir=%script_dir%/.."
 cd %work_dir%
 
-composer update
 call %PHP_BINARY% -c php-win.ini vendor/bin/phpunit tests --debug