diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e68c2df..5d3b9a7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,11 +13,11 @@ jobs:
     strategy:
       matrix:
         ruby: ['2.6', '2.4']
-        redmine: ['4.0-stable', '4.1-stable', 'master']
+        redmine: ['4.0-stable', '4.1-stable', '4.2-stable', 'master']
         db: ['postgres', 'mysql']
         include:
           - ruby: '2.7'
-            redmine: master
+            redmine: 4.2-stable
             db: postgres
       fail-fast: false