diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0ed1be1..1a435e8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -126,6 +126,7 @@ jobs:
         .\configure --with-prefix=${{steps.setup-php-sdk.outputs.prefix}} --enable-awscrt=shared --enable-cli --enable-openssl
         nmake
         nmake generate-php-ini
+        composer update --ignore-platform-req=ext-awscrt
         .\dev-scripts\run_tests ${{steps.setup-php-sdk.outputs.prefix}}\php
 
   # windows-vc14:
diff --git a/dev-scripts/run_tests.bat b/dev-scripts/run_tests.bat
index 4731a2d..b0a6b3e 100644
--- a/dev-scripts/run_tests.bat
+++ b/dev-scripts/run_tests.bat
@@ -18,7 +18,6 @@ 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
 
 endlocal