diff --git a/.github/workflows/cabal-in-nix-shell.yml b/.github/workflows/cabal-in-nix-shell.yml
index a60c552..9dc137a 100644
--- a/.github/workflows/cabal-in-nix-shell.yml
+++ b/.github/workflows/cabal-in-nix-shell.yml
@@ -8,7 +8,7 @@ jobs:
   build_init:
     strategy:
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04, macos-13, macos-12]
+        os: [ubuntu-22.04, ubuntu-20.04, macos-13]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/nix-build.yml b/.github/workflows/nix-build.yml
index 9d6ff53..1ad2aec 100644
--- a/.github/workflows/nix-build.yml
+++ b/.github/workflows/nix-build.yml
@@ -8,7 +8,7 @@ jobs:
   nix-build:
     strategy:
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04, macos-13, macos-12]
+        os: [ubuntu-22.04, ubuntu-20.04, macos-13]
     runs-on: ${{ matrix.os }}
     permissions:
       contents: read