diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 78ff874e75501..99e5c8af0b0ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -297,7 +297,7 @@ jobs:
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               DIST_REQUIRE_ALL_TOOLS: 1
-            os: macos-latest
+            os: macos-10.15
           - name: dist-x86_64-apple-alt
             env:
               SCRIPT: "./x.py dist"
@@ -306,7 +306,7 @@ jobs:
               MACOSX_DEPLOYMENT_TARGET: 10.7
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
-            os: macos-latest
+            os: macos-10.15
           - name: x86_64-apple
             env:
               SCRIPT: "./x.py --stage 2 test"
@@ -316,7 +316,7 @@ jobs:
               MACOSX_STD_DEPLOYMENT_TARGET: 10.7
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
-            os: macos-latest
+            os: macos-10.15
           - name: dist-aarch64-apple
             env:
               SCRIPT: "./x.py dist --stage 2"
@@ -330,7 +330,7 @@ jobs:
               NO_DEBUG_ASSERTIONS: 1
               DIST_REQUIRE_ALL_TOOLS: 1
               JEMALLOC_SYS_WITH_LG_PAGE: 14
-            os: macos-latest
+            os: macos-10.15
           - name: x86_64-msvc-1
             env:
               RUST_CONFIGURE_ARGS: "--build=x86_64-pc-windows-msvc --enable-profiler"
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index c9f8692d41887..53826d6427747 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -77,7 +77,7 @@ x--expand-yaml-anchors--remove:
     <<: *base-job
 
   - &job-macos-xl
-    os: macos-latest  # We don't have an XL builder for this
+    os: macos-10.15  # We don't have an XL builder for this
     <<: *base-job
 
   - &job-windows-xl