diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index aa198fe..213fb54 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -85,6 +85,7 @@
     'USE_HEADERMAP' => 'NO',
     'ALWAYS_SEARCH_USER_PATHS' => 'NO',
     'GCC_PREPROCESSOR_DEFINITIONS' => '"$(inherited)" "COCOAPODS=1" "PB_NO_PACKED_STRUCTS=1"',
+    'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
   }
 
   s.default_subspecs = 'Interface', 'Implementation'
diff --git a/gRPC-ProtoRPC.podspec b/gRPC-ProtoRPC.podspec
index b88b231..39a76b8 100644
--- a/gRPC-ProtoRPC.podspec
+++ b/gRPC-ProtoRPC.podspec
@@ -52,5 +52,6 @@
     'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1',
     # This is needed by all pods that depend on gRPC-RxLibrary:
     'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES',
+    'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
   }
 end
diff --git a/gRPC-RxLibrary.podspec b/gRPC-RxLibrary.podspec
index 215fc73..a90a8bc 100644
--- a/gRPC-RxLibrary.podspec
+++ b/gRPC-RxLibrary.podspec
@@ -44,4 +44,8 @@
   s.source_files = "#{src_dir}/*.{h,m}", "#{src_dir}/**/*.{h,m}"
   s.private_header_files = "#{src_dir}/private/*.h"
   s.header_mappings_dir = "#{src_dir}"
+
+  s.pod_target_xcconfig = {
+    'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
+  }
 end
diff --git a/gRPC.podspec b/gRPC.podspec
index 3cda60c..16452cd 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -50,6 +50,7 @@
   s.pod_target_xcconfig = {
     # This is needed by all pods that depend on gRPC-RxLibrary:
     'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES',
+    'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
   }
 
   s.subspec 'Main' do |ss|
diff --git a/templates/gRPC-Core.podspec.template b/templates/gRPC-Core.podspec.template
index e34bc83..2a583e0 100644
--- a/templates/gRPC-Core.podspec.template
+++ b/templates/gRPC-Core.podspec.template
@@ -112,6 +112,7 @@
       'USE_HEADERMAP' => 'NO',
       'ALWAYS_SEARCH_USER_PATHS' => 'NO',
       'GCC_PREPROCESSOR_DEFINITIONS' => '"$(inherited)" "COCOAPODS=1" "PB_NO_PACKED_STRUCTS=1"',
+      'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
     }
 
     s.default_subspecs = 'Interface', 'Implementation'
diff --git a/templates/gRPC-ProtoRPC.podspec.template b/templates/gRPC-ProtoRPC.podspec.template
index 4d99f6e..d2dcc42 100644
--- a/templates/gRPC-ProtoRPC.podspec.template
+++ b/templates/gRPC-ProtoRPC.podspec.template
@@ -54,5 +54,6 @@
       'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1',
       # This is needed by all pods that depend on gRPC-RxLibrary:
       'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES',
+      'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
     }
   end
diff --git a/templates/gRPC-RxLibrary.podspec.template b/templates/gRPC-RxLibrary.podspec.template
index de4ee1e..14147d7 100644
--- a/templates/gRPC-RxLibrary.podspec.template
+++ b/templates/gRPC-RxLibrary.podspec.template
@@ -46,4 +46,8 @@
     s.source_files = "#{src_dir}/*.{h,m}", "#{src_dir}/**/*.{h,m}"
     s.private_header_files = "#{src_dir}/private/*.h"
     s.header_mappings_dir = "#{src_dir}"
+
+    s.pod_target_xcconfig = {
+      'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
+    }
   end
diff --git a/templates/gRPC.podspec.template b/templates/gRPC.podspec.template
index 4b360cf..6616e74 100644
--- a/templates/gRPC.podspec.template
+++ b/templates/gRPC.podspec.template
@@ -52,6 +52,7 @@
     s.pod_target_xcconfig = {
       # This is needed by all pods that depend on gRPC-RxLibrary:
       'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES',
+      'CLANG_WARN_STRICT_PROTOTYPES' => 'NO',
     }
 
     s.subspec 'Main' do |ss|
diff --git a/tools/internal_ci/helper_scripts/prepare_build_macos_rc b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
index 5a5898f..5196c7b 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_macos_rc
+++ b/tools/internal_ci/helper_scripts/prepare_build_macos_rc
@@ -33,6 +33,7 @@
 
 # If this is a PR using RUN_TESTS_FLAGS var, then add flags to filter tests
 if [ -n "$KOKORO_GITHUB_PULL_REQUEST_NUMBER" ] && [ -n "$RUN_TESTS_FLAGS" ]; then
+  brew update
   brew install jq
   ghprbTargetBranch=$(curl -s https://api.github.com/repos/grpc/grpc/pulls/$KOKORO_GITHUB_PULL_REQUEST_NUMBER | jq -r .base.ref)
   export RUN_TESTS_FLAGS="$RUN_TESTS_FLAGS --filter_pr_tests --base_branch origin/$ghprbTargetBranch"