diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44849afceb..104acdde0c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
     strategy:
       matrix:
-        os: [ubuntu-18.04, windows-2016, macOS-latest]
+        os: [ubuntu-18.04, windows-2016, macOS-10.15]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v1