diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index caa9656..2fb5bd8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,12 +12,16 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7', '2.6', '2.5']
+        ruby: ['2.7', '2.6', '3.0']
         redmine: ['4.1-stable', '4.2-stable', 'master']
         db: ['postgres', 'mysql']
         exclude:
           - ruby: '2.7'
             redmine: 4.1-stable
+          - ruby: '3.0'
+            redmine: 4.1-stable
+          - ruby: '3.0'
+            redmine: 4.2-stable
       fail-fast: false
 
     services: