diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 21b7140..030a638 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,14 +15,14 @@ jobs:
         ruby: ['2.1.9', '2.2.10', '2.3.8' ]
         include:
           - ruby: '2.1.9'
-            rack_version: '1'
-            redis_rb_version: '3'
+            rack_version: '1.6.13'
+            redis_rb_version: '3.3.5'
           - ruby: '2.2.10'
-            rack_version: '2.2'
-            redis_rb_version: '4'
+            rack_version: '2.1.4.3'
+            redis_rb_version: '4.1.1'
           - ruby: '2.3.8'
-            rack_version: '2.2'
-            redis_rb_version: '4'        
+            rack_version: '2.2.8'
+            redis_rb_version: '4.4.0'
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4