diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 470cf2d..4699355 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,7 +3,7 @@ name: Build (and release)
 on: [ push, pull_request ]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@v2
       with: