diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 310f7e2..34e00b8 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -12,8 +12,6 @@ jobs:
     strategy:
       matrix:
         container:
-        - ruby:1.9
-        - ruby:2.0
         - ruby:2.1
         - ruby:2.2
         - ruby:2.3