diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 38a7f23..79685f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -104,7 +104,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04]
+        os: [ubuntu-18.04]
         rust: [stable]
         binary: [release]
     env: