diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 60cd176c6d70..bfb9958736a9 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -32,6 +32,7 @@ jobs:
       CARGO_LLVM_COV: 1
       CARGO_LLVM_COV_SHOW_ENV: 1
       CARGO_LLVM_COV_TARGET_DIR: '/Users/runner/work/polars/polars/target'
+      CMAKE_BUILD_PARALLEL_LEVEL: 10 # fix resource temporarily unavailable on macOS for libz-ng-sys (https://github.com/pola-rs/polars/pull/14715)
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/release-python.yml b/.github/workflows/release-python.yml
index ac1a272746eb..d29f9d799059 100644
--- a/.github/workflows/release-python.yml
+++ b/.github/workflows/release-python.yml
@@ -95,6 +95,7 @@ jobs:
     env:
       SED_INPLACE: ${{ matrix.os == 'macos-latest' && '-i ''''' || '-i'}}
       CPU_CHECK_MODULE: py-polars/polars/_cpu_check.py
+      CMAKE_BUILD_PARALLEL_LEVEL: 10 # fix resource temporarily unavailable on macOS for libz-ng-sys (https://github.com/pola-rs/polars/pull/14715)
 
     steps:
       - uses: actions/checkout@v4