diff --git a/.github/workflows/macos-ios.yml b/.github/workflows/macos-ios.yml
index a62baa6..b3929ce 100644
--- a/.github/workflows/macos-ios.yml
+++ b/.github/workflows/macos-ios.yml
@@ -9,7 +9,9 @@ on:
 jobs:
   build:
 
-    runs-on: macos-latest
+    # This did say "macos-latest", but it turns out "latest" is
+    # still 10.15 even though 11.0 is out. I know that feeling
+    runs-on: macos-11.0
 
     steps:
     - uses: actions/checkout@v2