diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d7aee152..f6fa636d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,7 +64,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        poko_sample_kotlin_version: [ ~, 2.1.20-Beta1 ]
+        poko_sample_kotlin_version: [ ~, 2.1.10-RC, 2.1.20-Beta1 ]
     env:
       poko_sample_kotlin_version: ${{ matrix.poko_sample_kotlin_version }}
     steps: