diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 4b1a8f38a34..ffdbd88f157 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -994,4 +994,9 @@ Pod::Spec.new do |s|
                       'test/core/util/port.c',
                       'test/core/util/port_server_client.{c,h}'
   end
+
+  # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
+  s.prepare_command = <<-END_OF_COMMAND
+    find src/core/ -type f -exec sed -E -i '.back' 's;#include "third_party/nanopb/(.*)";#include <nanopb/\\1>;g' {} \\\;
+  END_OF_COMMAND
 end
diff --git a/templates/gRPC-Core.podspec.template b/templates/gRPC-Core.podspec.template
index cfc13cf4dd9..616f2cbbff9 100644
--- a/templates/gRPC-Core.podspec.template
+++ b/templates/gRPC-Core.podspec.template
@@ -178,4 +178,9 @@
                         'test/core/util/port.c',
                         'test/core/util/port_server_client.{c,h}'
     end
+
+    # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
+    s.prepare_command = <<-END_OF_COMMAND
+      find src/core/ -type f -exec sed -E -i '.back' 's;#include "third_party/nanopb/(.*)";#include <nanopb/\\1>;g' {} \\\;
+    END_OF_COMMAND
   end
diff --git a/third_party/protobuf b/third_party/protobuf
index eaeca0d42b1..80a37e0782d 160000
--- a/third_party/protobuf
+++ b/third_party/protobuf
@@ -1 +1 @@
-Subproject commit eaeca0d42b1fc4a8023a7f90d889631eda9360a3
+Subproject commit 80a37e0782d2d702d52234b62dd4b9ec74fd2c95
diff --git a/tools/flakes/detect_flakes.py b/tools/flakes/detect_flakes.py
index 32899074da6..2aff4c08723 100644
--- a/tools/flakes/detect_flakes.py
+++ b/tools/flakes/detect_flakes.py
@@ -68,10 +68,13 @@ ORDER BY timestamp desc
   query_job = big_query_utils.sync_query_job(bq, 'grpc-testing', query)
   page = bq.jobs().getQueryResults(
       pageToken=None, **query_job['jobReference']).execute(num_retries=3)
-  testname_to_cols = {row['f'][0]['v']:
-                      (row['f'][1]['v'], row['f'][2]['v'], row['f'][3]['v'])
-                      for row in page['rows']}
-  return testname_to_cols
+  rows = page.get('rows')
+  if rows:
+    return {row['f'][0]['v']:
+            (row['f'][1]['v'], row['f'][2]['v'], row['f'][3]['v'])
+            for row in rows}
+  else:
+    return {}
 
 
 def get_new_flakes():
@@ -91,6 +94,8 @@ def main():
   if new_flakes:
     print("Found {} new flakes:".format(len(new_flakes)))
     print_table(new_flakes)
+  else:
+    print("No new flakes found!")
 
 
 if __name__ == '__main__':
diff --git a/tools/run_tests/sanity/check_submodules.sh b/tools/run_tests/sanity/check_submodules.sh
index d59747f92ba..b0a0c3a8eb2 100755
--- a/tools/run_tests/sanity/check_submodules.sh
+++ b/tools/run_tests/sanity/check_submodules.sh
@@ -31,7 +31,7 @@ cat << EOF | awk '{ print $1 }' | sort > $want_submodules
  886e7d75368e3f4fab3f4d0d3584e4abfc557755 third_party/boringssl-with-bazel (version_for_cocoapods_7.0-857-g886e7d7)
  30dbc81fb5ffdc98ea9b14b1918bfe4e8779b26e third_party/gflags (v2.2.0)
  ec44c6c1675c25b9827aacd08c02433cccde7780 third_party/googletest (release-1.8.0)
- eaeca0d42b1fc4a8023a7f90d889631eda9360a3 third_party/protobuf (v3.4.0rc3)
+ 80a37e0782d2d702d52234b62dd4b9ec74fd2c95 third_party/protobuf (v3.4.0)
  cacf7f1d4e3d44d871b605da3b647f07d718623f third_party/zlib (v1.2.11)
  7691f773af79bf75a62d1863fd0f13ebf9dc51b1 third_party/cares/cares (1.12.0)
 EOF