diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f1c3febf..a67be8180 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -140,7 +140,7 @@ jobs:
             sdk: 10.11
           - name: x86_64-linux-experimental
             host: x86_64-unknown-linux-gnu
-            os: ubuntu-20.04
+            os: ubuntu-18.04
             packages: bc python3-zmq
             run-bench: true
             run-tests: true