diff --git a/.github/workflows/test-osx.yml b/.github/workflows/test-osx.yml
index 03b99f8ca7..854bcb8ab2 100644
--- a/.github/workflows/test-osx.yml
+++ b/.github/workflows/test-osx.yml
@@ -24,6 +24,9 @@ jobs:
         brew install boost
         python -m pip install --upgrade pip
         python -m pip install setuptools faber
+        boostDir=/opt/homebrew/Cellar/boost/1.86.0
+        [[ -d $boostDir ]] || boostDir=/opt/homebrew/Cellar/boost/1.86.0_2
+        echo "boostDir=$boostDir" >> "$GITHUB_ENV"
     - name: build
       run: |
         python --version
@@ -32,7 +35,7 @@ jobs:
         faber -v
         sed -e "s/\$PYTHON/python/g" .ci/faber > ~/.faber
         faber \
-          --with-boost-include=/opt/homebrew/Cellar/boost/1.86.0/include \
+          --with-boost-include=$boostDir/include \
           --builddir=build \
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
@@ -40,7 +43,7 @@ jobs:
     - name: test
       run: |
         faber \
-          --with-boost-include=/opt/homebrew/Cellar/boost/1.86.0/include \
+          --with-boost-include=$boostDir/include \
           --builddir=build\
           cxx.name=${{ matrix.cxx }} \
           cxxflags=-std=${{ matrix.std }} \
diff --git a/include/boost/python/detail/defaults_def.hpp b/include/boost/python/detail/defaults_def.hpp
index a721b76794..3b7bbaf17e 100644
--- a/include/boost/python/detail/defaults_def.hpp
+++ b/include/boost/python/detail/defaults_def.hpp
@@ -89,7 +89,7 @@ namespace detail
       NameSpaceT& name_space
       , char const* name
       , Func f
-      , keyword_range const& kw // ignored
+      , keyword_range const&
       , CallPolicies const& policies
       , char const* doc
       , module*
diff --git a/include/boost/python/numpy/ndarray.hpp b/include/boost/python/numpy/ndarray.hpp
index 2cb3b509f8..f10e87091a 100644
--- a/include/boost/python/numpy/ndarray.hpp
+++ b/include/boost/python/numpy/ndarray.hpp
@@ -176,7 +176,7 @@ ndarray from_data_impl(void * data,
 		       Container strides,
 		       object const & owner,
 		       bool writeable,
-		       typename boost::enable_if< boost::python::detail::is_integral<typename Container::value_type> >::type * enabled = NULL)
+		       typename boost::enable_if< boost::python::detail::is_integral<typename Container::value_type> >::type * = NULL)
 {
   std::vector<Py_intptr_t> shape_(shape.begin(),shape.end());
   std::vector<Py_intptr_t> strides_(strides.begin(), strides.end());
diff --git a/src/object/function.cpp b/src/object/function.cpp
index 7b6ab9f08b..fa0aff48ff 100644
--- a/src/object/function.cpp
+++ b/src/object/function.cpp
@@ -21,6 +21,7 @@
 #include <boost/python/detail/none.hpp>
 #include <boost/mpl/vector/vector10.hpp>
 
+#include <boost/core/ignore_unused.hpp>
 #include <boost/bind/bind.hpp>
 
 #include <algorithm>
@@ -628,6 +629,7 @@ extern "C"
     function_descr_get(PyObject *func, PyObject *obj, PyObject *type_)
     {
 #if PY_VERSION_HEX >= 0x03000000
+        boost::ignore_unused(type_);
         // The implement is different in Python 3 because of the removal of unbound method
         if (obj == Py_None || obj == NULL) {
             Py_INCREF(func);
diff --git a/src/object/function_doc_signature.cpp b/src/object/function_doc_signature.cpp
index 18d458698d..a7c4db9a5f 100644
--- a/src/object/function_doc_signature.cpp
+++ b/src/object/function_doc_signature.cpp
@@ -105,7 +105,7 @@ namespace boost { namespace python { namespace objects {
         return res;
     }
 
-    str function_doc_signature_generator::raw_function_pretty_signature(function const *f, size_t n_overloads,  bool cpp_types )
+    str function_doc_signature_generator::raw_function_pretty_signature(function const *f, size_t /*n_overloads*/,  bool /*cpp_types*/ )
     {
         str res("object");