diff --git a/.github/workflows/linux-x64.yml b/.github/workflows/linux-x64.yml
index a294e020..6c8b7c6a 100644
--- a/.github/workflows/linux-x64.yml
+++ b/.github/workflows/linux-x64.yml
@@ -329,10 +329,20 @@ jobs:
         run: |
           test -f ./tpc
           test -f "${PHPX_HOME}/lib/libphpx.so"
+          test -f third_party/phpy/modules/phpy.so
           test -f "${PHP_HOME}/lib/libphp.so"
           chmod +x ./tpc
           echo "LD_LIBRARY_PATH=${PHPX_HOME}/lib:${PHP_HOME}/lib" >> "${GITHUB_ENV}"
 
+      - name: Enable phpy extension for compiler
+        shell: bash
+        run: |
+          php_ini_dir="$(php-config --ini-dir)"
+          echo "extension=${GITHUB_WORKSPACE}/third_party/phpy/modules/phpy.so" \
+            | sudo tee "${php_ini_dir}/90-phpy.ini"
+          echo "PHP_INI_SCAN_DIR=${php_ini_dir}" >> "${GITHUB_ENV}"
+          php --ri phpy
+
       - name: Run EXT/LIB integration tests
         shell: bash
         run: |
diff --git a/.github/workflows/windows-build.yml b/.github/workflows/windows-build.yml
index 7988ae9d..05aa47c0 100644
--- a/.github/workflows/windows-build.yml
+++ b/.github/workflows/windows-build.yml
@@ -42,7 +42,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           coverage: none
-          extensions: zip
+          extensions: zip, mbstring
           tools: composer:v2
         env:
           fail-fast: true
@@ -350,11 +350,13 @@ jobs:
         run: |
           $ErrorActionPreference = 'Stop'
 
+          $env:PHPRC = Join-Path $env:PHP_HOME 'php.ini'
           $env:PATH = "$env:PHPX_HOME\build;$env:PATH"
           & .\tpc.exe tests\windows\smoke\project.yml --job 1 --no-progress
           if ($LASTEXITCODE -ne 0) {
               throw "Windows smoke project compilation failed with exit code $LASTEXITCODE"
           }
+          Remove-Item Env:PHPRC
 
           $smokeExe = Join-Path '${{ github.workspace }}' 'tests\windows\smoke\windows_smoke.exe'
           if (-not (Test-Path $smokeExe)) {
@@ -392,6 +394,7 @@ jobs:
         shell: pwsh
         run: |
           $ErrorActionPreference = 'Stop'
+          $env:PHPRC = Join-Path $env:PHP_HOME 'php.ini'
 
           composer install --no-dev --prefer-dist --no-progress --classmap-authoritative
           if ($LASTEXITCODE -ne 0) {