diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c7b01a72..5932eeb1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,26 @@ jobs:
         unicorn-version:
           - "1.0.3"
           - "2.0.1.post1"
+        exclude:
+          # Unicorn 1.x breaks on macOS 14+
+          - operating-system: macos-latest
+            unicorn-version: "1.0.3"
+        include:
+          - operating-system: macos-13
+            unicorn-version: "1.0.3"
+            lua-version: "5.1"
+          - operating-system: macos-13
+            unicorn-version: "1.0.3"
+            lua-version: "5.2"
+          - operating-system: macos-13
+            unicorn-version: "1.0.3"
+            lua-version: "5.3"
+          - operating-system: macos-13
+            unicorn-version: "1.0.3"
+            lua-version: "5.4"
+          - operating-system: macos-13
+            unicorn-version: "1.0.3"
+            lua-version: "luajit-openresty"
     steps:
       - uses: actions/checkout@v4.1.7
         with: