diff --git a/.github/workflows/_run-tests.yml b/.github/workflows/_run-tests.yml
index aa1c0b30c..934923c06 100644
--- a/.github/workflows/_run-tests.yml
+++ b/.github/workflows/_run-tests.yml
@@ -79,7 +79,7 @@ jobs:
     steps:
       - name: Define Test Group Name
         id: test-group
-        uses: mad9000/actions-find-and-replace-string@5
+        uses: mad9000/actions-find-and-replace-string@6
         with:
           source: ${{ inputs.test-group }}
           find: '/'
@@ -272,29 +272,26 @@ jobs:
 
       # Write any secrets, such as API keys, to the .env.testing file now.
       - name: Define GitHub Secrets in .env.testing
-        uses: DamianReeves/write-file-action@v1.3
-        with:
-          path: ${{ env.PLUGIN_DIR }}/.env.testing
-          contents: |
-            WORDPRESS_V3_BLOCK_EDITOR_ENABLED=${{ env.WORDPRESS_V3_BLOCK_EDITOR_ENABLED }}
-            WORDPRESS_DB_SQL_DUMP_FILE=${{ env.WORDPRESS_DB_SQL_DUMP_FILE }}
-            CONVERTKIT_API_KEY=${{ env.CONVERTKIT_API_KEY }}
-            CONVERTKIT_API_SECRET=${{ env.CONVERTKIT_API_SECRET }}
-            CONVERTKIT_API_KEY_NO_DATA=${{ env.CONVERTKIT_API_KEY_NO_DATA }}
-            CONVERTKIT_API_SECRET_NO_DATA=${{ env.CONVERTKIT_API_SECRET_NO_DATA }}
-            CONVERTKIT_OAUTH_ACCESS_TOKEN=${{ env.CONVERTKIT_OAUTH_ACCESS_TOKEN }}
-            CONVERTKIT_OAUTH_REFRESH_TOKEN=${{ env.CONVERTKIT_OAUTH_REFRESH_TOKEN }}
-            CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA=${{ env.CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA }}
-            CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA=${{ env.CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA }}
-            CONVERTKIT_OAUTH_CLIENT_ID=${{ env.CONVERTKIT_OAUTH_CLIENT_ID }}
-            CONVERTKIT_OAUTH_REDIRECT_URI=${{ env.CONVERTKIT_OAUTH_REDIRECT_URI }}
-            KIT_OAUTH_REDIRECT_URI=${{ env.KIT_OAUTH_REDIRECT_URI }}
-            CONVERTKIT_API_SIGNED_SUBSCRIBER_ID=${{ env.CONVERTKIT_API_SIGNED_SUBSCRIBER_ID }}
-            CONVERTKIT_API_SIGNED_SUBSCRIBER_ID_NO_ACCESS=${{ env.CONVERTKIT_API_SIGNED_SUBSCRIBER_ID_NO_ACCESS }}
-            CONVERTKIT_API_RECAPTCHA_SITE_KEY=${{ env.CONVERTKIT_API_RECAPTCHA_SITE_KEY }}
-            CONVERTKIT_API_RECAPTCHA_SECRET_KEY=${{ env.CONVERTKIT_API_RECAPTCHA_SECRET_KEY }}
-
-          write-mode: overwrite
+        run: |
+          cat > ${{ env.PLUGIN_DIR }}/.env.testing << 'ENVEOF'
+          WORDPRESS_V3_BLOCK_EDITOR_ENABLED=${{ env.WORDPRESS_V3_BLOCK_EDITOR_ENABLED }}
+          WORDPRESS_DB_SQL_DUMP_FILE=${{ env.WORDPRESS_DB_SQL_DUMP_FILE }}
+          CONVERTKIT_API_KEY=${{ env.CONVERTKIT_API_KEY }}
+          CONVERTKIT_API_SECRET=${{ env.CONVERTKIT_API_SECRET }}
+          CONVERTKIT_API_KEY_NO_DATA=${{ env.CONVERTKIT_API_KEY_NO_DATA }}
+          CONVERTKIT_API_SECRET_NO_DATA=${{ env.CONVERTKIT_API_SECRET_NO_DATA }}
+          CONVERTKIT_OAUTH_ACCESS_TOKEN=${{ env.CONVERTKIT_OAUTH_ACCESS_TOKEN }}
+          CONVERTKIT_OAUTH_REFRESH_TOKEN=${{ env.CONVERTKIT_OAUTH_REFRESH_TOKEN }}
+          CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA=${{ env.CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA }}
+          CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA=${{ env.CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA }}
+          CONVERTKIT_OAUTH_CLIENT_ID=${{ env.CONVERTKIT_OAUTH_CLIENT_ID }}
+          CONVERTKIT_OAUTH_REDIRECT_URI=${{ env.CONVERTKIT_OAUTH_REDIRECT_URI }}
+          KIT_OAUTH_REDIRECT_URI=${{ env.KIT_OAUTH_REDIRECT_URI }}
+          CONVERTKIT_API_SIGNED_SUBSCRIBER_ID=${{ env.CONVERTKIT_API_SIGNED_SUBSCRIBER_ID }}
+          CONVERTKIT_API_SIGNED_SUBSCRIBER_ID_NO_ACCESS=${{ env.CONVERTKIT_API_SIGNED_SUBSCRIBER_ID_NO_ACCESS }}
+          CONVERTKIT_API_RECAPTCHA_SITE_KEY=${{ env.CONVERTKIT_API_RECAPTCHA_SITE_KEY }}
+          CONVERTKIT_API_RECAPTCHA_SECRET_KEY=${{ env.CONVERTKIT_API_RECAPTCHA_SECRET_KEY }}
+          ENVEOF
 
       # Installs wp-browser, Codeception, PHP CodeSniffer and anything else needed to run tests.
       - name: Run Composer