diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b3a6b56..749a146 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -234,7 +234,7 @@ jobs:
             *-macOS.pkg
 
   win32:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@v2
         with: