diff --git a/.travis.yml b/.travis.yml
index 4fcea73..94e02ce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,8 @@ matrix:
   include:
     - php: 7.4
       env: WP_VERSION=nightly CODE_STYLES=phpcs
+    - php: 7.4
+      env: WP_VERSION=5.5 CODE_STYLES=phpcs
     - php: 7.4
       env: WP_VERSION=5.4 CODE_STYLES=phpcs
     - php: 7.3