diff --git a/.github/actions/build-iqtree/action.yml b/.github/actions/build-iqtree/action.yml
index 4f0e1a6d..3244f804 100644
--- a/.github/actions/build-iqtree/action.yml
+++ b/.github/actions/build-iqtree/action.yml
@@ -52,7 +52,7 @@ runs:
 
     - name: Install Boost
       if: runner.os == 'Windows' && steps.cache.outputs.cache-hit != 'true'
-      uses: MarkusJx/install-boost@v2.5.0
+      uses: MarkusJx/install-boost@6d8df42f57de83c5b326b5b83e7b35d650030103
       id: install-boost
       with:
         boost_version: 1.84.0
diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index c9e9d056..24093a52 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -52,7 +52,7 @@ jobs:
 
       - name: Install Boost
         if: runner.os == 'Windows'
-        uses: MarkusJx/install-boost@v2.5.0
+        uses: MarkusJx/install-boost@6d8df42f57de83c5b326b5b83e7b35d650030103
         id: install-boost
         with:
           boost_version: 1.84.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index dcb76cc5..5150c79f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -52,7 +52,7 @@ jobs:
 
       - name: Install Boost
         if: runner.os == 'Windows'
-        uses: MarkusJx/install-boost@v2.5.0
+        uses: MarkusJx/install-boost@6d8df42f57de83c5b326b5b83e7b35d650030103
         id: install-boost
         with:
           boost_version: 1.84.0
diff --git a/pyproject.toml b/pyproject.toml
index 01c15561..8e1a0606 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=61.0", "pybind11==3.0.0", "delvewheel==1.11.1"]
+requires = ["setuptools>=61.0", "pybind11==3.0.1", "delvewheel==1.11.1"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -51,7 +51,7 @@ Documentation = "https://piqtree.readthedocs.io"
 [project.optional-dependencies]
 dev = [
     "cibuildwheel==3.1.3",
-    "pybind11==3.0.0",
+    "pybind11==3.0.1",
     "delvewheel==1.11.1",
     "scriv",
     "piqtree[test]",
diff --git a/setup.py b/setup.py
index 628678ff..eefff3b2 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,5 @@
 """setup for piqtree."""
 
-import os
 import platform
 import subprocess
 from pathlib import Path
@@ -51,10 +50,6 @@ def setup_macos() -> None:
     brew_prefix_llvm = get_brew_prefix("llvm")
     brew_prefix_libomp = get_brew_prefix("libomp")
 
-    # Use Homebrew's clang/clang++
-    os.environ["CC"] = str(brew_prefix_llvm / "bin" / "clang")
-    os.environ["CXX"] = str(brew_prefix_llvm / "bin" / "clang++")
-
     # Define OpenMP flags and libraries for macOS
     extra_compile_args.extend(["-Xpreprocessor", "-fopenmp"])
     extra_libs.extend(["z", "omp"])