diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 56809e8..685432d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     name: build
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: true