core/drupalci.yml | 10 +++++-----
 core/package.json |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/core/drupalci.yml b/core/drupalci.yml
index 413272eff3..79c65f54a6 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -18,30 +18,30 @@ build:
       # deprecated code.
       run_tests.phpunit:
         types: 'PHPUnit-Unit'
-        testgroups: '--all'
+        testgroups: '--module ckeditor5'
         suppress-deprecations: false
         halt-on-fail: false
       run_tests.kernel:
         types: 'PHPUnit-Kernel'
-        testgroups: '--all'
+        testgroups: '--module ckeditor5'
         suppress-deprecations: false
         halt-on-fail: false
       run_tests.build:
         # Limit concurrency due to disk space concerns.
         concurrency: 15
         types: 'PHPUnit-Build'
-        testgroups: '--all'
+        testgroups: '--module ckeditor5'
         suppress-deprecations: false
         halt-on-fail: false
       run_tests.functional:
         types: 'PHPUnit-Functional'
-        testgroups: '--all'
+        testgroups: '--module ckeditor5'
         suppress-deprecations: false
         halt-on-fail: false
       run_tests.javascript:
         concurrency: 15
         types: 'PHPUnit-FunctionalJavascript'
-        testgroups: '--all'
+        testgroups: '--module ckeditor5'
         suppress-deprecations: false
         halt-on-fail: false
       # Run nightwatch testing.
diff --git a/core/package.json b/core/package.json
index 2349562a9b..60eeb368fa 100644
--- a/core/package.json
+++ b/core/package.json
@@ -22,7 +22,7 @@
     "lint:css": "stylelint \"**/*.css\"",
     "lint:css-checkstyle": "stylelint \"**/*.css\" --custom-formatter ./node_modules/stylelint-checkstyle-formatter/index.js",
     "lint:yaml": "node ./node_modules/eslint/bin/eslint.js --ext .yml .",
-    "test:nightwatch": "cross-env BABEL_ENV=development node -r dotenv-safe/config -r @babel/register ./node_modules/.bin/nightwatch --config ./tests/Drupal/Nightwatch/nightwatch.conf.js",
+    "test:nightwatch": "cross-env BABEL_ENV=development node -r dotenv-safe/config -r @babel/register ./node_modules/.bin/nightwatch --config ./tests/Drupal/Nightwatch/nightwatch.conf.js --tag ckeditor5",
     "prettier": "prettier --write \"./**/*.es6.js\" \"./tests/Drupal/Nightwatch/**/*.js\" \"./modules/ckeditor5/js/ckeditor5_plugins/**/*.js\"",
     "spellcheck": "cspell",
     "spellcheck:make-drupal-dict": "rm -f misc/cspell/dictionary.txt && touch misc/cspell/dictionary.txt && yarn -s spellcheck:core --unique --wordsOnly | tr '[:upper:]' '[:lower:]' | tr -d \\\\\\\\ | LC_ALL=C sort -u -o misc/cspell/dictionary.txt",