diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 678d3cde6ee4e4c9c4f7be0cb7ed059347a9f3a2..63d682515eaef5034da5ce8b571dd70c4c17a99c 100755
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,6 +17,8 @@ before_script:
   - |
     if [[ $(php -v) =~ "PHP 7." ]]; then
       composer global require "phpunit/phpunit=6.1.*"
+    elif [[ $(php -v) =~ "PHP 5.6" ]]; then
+      composer global require "phpunit/phpunit=5.4.*"
     else
       composer global require "phpunit/phpunit=4.8.*"
     fi
diff --git a/README.md b/README.md
index ff3bcf8dba334f2908487bcc184e050a9d562b22..31cdb426e6f249ce36bd9fd6abf65e29a66e8e43 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 **Donate link:** https://ethitter.com/donate/  
 **Tags:** latest, latest post, redirect, redirect latest, redirect post  
 **Requires at least:** 4.5  
-**Tested up to:** 5.4  
+**Tested up to:** 5.5  
 **Stable tag:** 0.3  
 **License:** GPLv2 or later  
 **License URI:** http://www.gnu.org/licenses/gpl-2.0.html  
diff --git a/readme.txt b/readme.txt
index 90989bb454b9b7f2e2e8a75af0d57e79400eb0dd..5341bc750c9179961f5f839d9ddbe33e4783075b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: ethitter
 Donate link: https://ethitter.com/donate/
 Tags: latest, latest post, redirect, redirect latest, redirect post
 Requires at least: 4.5
-Tested up to: 5.4
+Tested up to: 5.5
 Stable tag: 0.3
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html