diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4019814..bf77471 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -116,6 +116,8 @@ jobs:
       matrix:
         python-version: [ '3.10.5' ]
         # Requires universal2 build of python, which we get if we ask for 3.10.5 x86! Pypy not available in universal2
+    env:
+      MACOSX_DEPLOYMENT_TARGET: 11.0
     steps:
       - uses: actions/checkout@v2
         with: