diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index f4a6581..b089f81 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -9,10 +9,9 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
-          - '2.7'
-          - '3.0'
-          - '3.1'
           - '3.2'
+          - '3.3'
+          - '3.4'
         os:
           - ubuntu-latest
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}