diff --git a/eng/pipelines/pr-validation-pipeline.yml b/eng/pipelines/pr-validation-pipeline.yml
index 9c2cad12..e5389183 100644
--- a/eng/pipelines/pr-validation-pipeline.yml
+++ b/eng/pipelines/pr-validation-pipeline.yml
@@ -92,6 +92,9 @@ jobs:
 
   - script: |
       brew update
+      # Uninstall existing CMake to avoid tap conflicts
+      brew uninstall cmake --ignore-dependencies || echo "CMake not installed or already removed"
+      # Install CMake from homebrew/core
       brew install cmake
     displayName: 'Install CMake'