diff --git a/.circleci/config.yml b/.circleci/config.yml
index 67c8ded0d41c91915f0a94d5b4d69303e1c498da..3936fe1495fcc4927c60158e417beffd9362dbd2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -244,13 +244,11 @@ workflows:
             tahoe-lafs-source:
             - "tahoe-lafs"
 
-    - "macos-tests":
-        matrix:
-          parameters:
-            py-version:
-            - "3.9"
-
-            xcode-version:
-            # https://circleci.com/docs/2.0/testing-ios/#supported-xcode-versions
-            - "12.3.0"
-            - "11.7.0"
+    # https://circleci.com/docs/2.0/testing-ios/#supported-xcode-versions
+    - "macos-tests-py3_8-xcode11_7_0":
+        py-version: "3.8"
+        xcode-version: "11.7.0"
+
+    - "macos-tests-py3_9-xcode12_3_0":
+        py-version: "3.9"
+        xcode-version: "12.3.0"