diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 81bdff9..24b3fab 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,15 +12,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 1.9.3
-          - '2.0'
-          - 2.1
-          - 2.2
-          - 2.4
-          - 2.5
-          - 2.6
-          - 2.7
-          - '3.0'
+          - 3.0
           - 3.1
           - 3.2
           - 3.3