diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c8489b911..0fcc22e37 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        os: [ ubuntu-20.04, macos-10.15, windows-2019 ] # list of os: https://github.com/actions/virtual-environments
+        os: [ ubuntu-20.04, macos-11, windows-2019 ] # list of os: https://github.com/actions/virtual-environments
     runs-on: ${{ matrix.os }}
 
     steps: