diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27ec2d5..b0846d2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,8 +11,6 @@ jobs:
 
       matrix:
         ruby-version:
-          - 2.1
-          - 2.2
           - 2.3
           - 2.4
           - 2.5