diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 19a03e4..2a12f48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        otp: ['23']
+        otp: ['20', '21', '22', '23']
         rebar3: ['3.14.1', '3.14.3']
     steps:
       - uses: actions/checkout@v4