diff --git a/.github/workflows/push_pull.yml b/.github/workflows/push_pull.yml
index 1a2eb4e39f..94d9bf24d9 100644
--- a/.github/workflows/push_pull.yml
+++ b/.github/workflows/push_pull.yml
@@ -10,7 +10,7 @@ permissions:
 jobs:
   macos:
     runs-on: macos-12
-    if: ${{ github.repository == 'espressomd/espresso' }}
+    if: false
     steps:
       - name: Checkout
         uses: actions/checkout@main
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c40cb72a7..5c643b7d4b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -435,6 +435,9 @@ if(ESPRESSO_BUILD_TESTS)
 endif()
 
 find_package(Boost 1.74.0 REQUIRED ${BOOST_COMPONENTS})
+if(${Boost_VERSION} VERSION_GREATER_EQUAL 1.84.0)
+  message(FATAL_ERROR "Boost version ${Boost_VERSION} is unsupported.")
+endif()
 
 #
 # Paths