diff --git a/.github/workflows/quicktest.yml b/.github/workflows/quicktest.yml
index d8b5a85..f81e66e 100644
--- a/.github/workflows/quicktest.yml
+++ b/.github/workflows/quicktest.yml
@@ -43,7 +43,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          ini-values: error_reporting=-1, display_errors=On
+          ini-values: error_reporting=-1, display_errors=On, display_startup_errors=On
           coverage: none
 
       # Install dependencies and handle caching in one go.
@@ -124,9 +124,9 @@ jobs:
         id: set_ini
         run: |
           if [ "${{ contains( matrix.phpcs_version, 'dev' ) }}" != "true" ]; then
-            echo 'PHP_INI=error_reporting=E_ALL & ~E_DEPRECATED, display_errors=On' >> "$GITHUB_OUTPUT"
+            echo 'PHP_INI=error_reporting=E_ALL & ~E_DEPRECATED, display_errors=On, display_startup_errors=On' >> "$GITHUB_OUTPUT"
           else
-            echo 'PHP_INI=error_reporting=-1, display_errors=On' >> "$GITHUB_OUTPUT"
+            echo 'PHP_INI=error_reporting=-1, display_errors=On, display_startup_errors=On' >> "$GITHUB_OUTPUT"
           fi
 
       - name: Install PHP
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e348c39..004ecb7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -46,7 +46,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          ini-values: error_reporting=-1, display_errors=On
+          ini-values: error_reporting=-1, display_errors=On, display_startup_errors=On
           coverage: none
           tools: cs2pr
 
@@ -170,9 +170,9 @@ jobs:
           # On stable PHPCS versions, allow for PHP deprecation notices.
           # Unit tests don't need to fail on those for stable releases where those issues won't get fixed anymore.
           if [ "${{ contains( matrix.phpcs_version, 'dev' ) }}" != "true" ]; then
-            echo 'PHP_INI=error_reporting=E_ALL & ~E_DEPRECATED, display_errors=On' >> "$GITHUB_OUTPUT"
+            echo 'PHP_INI=error_reporting=E_ALL & ~E_DEPRECATED, display_errors=On, display_startup_errors=On' >> "$GITHUB_OUTPUT"
           else
-            echo 'PHP_INI=error_reporting=-1, display_errors=On' >> "$GITHUB_OUTPUT"
+            echo 'PHP_INI=error_reporting=-1, display_errors=On, display_startup_errors=On' >> "$GITHUB_OUTPUT"
           fi
 
       - name: Install PHP
diff --git a/.github/workflows/update-website.yml b/.github/workflows/update-website.yml
index 7255d94..33613a0 100644
--- a/.github/workflows/update-website.yml
+++ b/.github/workflows/update-website.yml
@@ -56,7 +56,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: 'latest'
-          ini-values: error_reporting=-1, display_errors=On, log_errors_max_len=0
+          ini-values: error_reporting=-1, display_errors=On, display_startup_errors=On, log_errors_max_len=0
           coverage: none
 
       - name: Prepare the files which will be deployed to the GH Pages website