diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7182253f..d87923b8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,11 +17,11 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest, ubuntu-latest, macos-latest]
+        os: [windows-latest, ubuntu-20.04, macos-latest]
         qt-version: [5.15.2, 5.12.12]
         pch: [true]
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-20.04
             qt-version: 5.15.2
             pch: false
       fail-fast: false