diff --git a/scripts/init_submodules.sh b/scripts/init_submodules.sh
index 5715c54..c3f66e2 100755
--- a/scripts/init_submodules.sh
+++ b/scripts/init_submodules.sh
@@ -18,5 +18,5 @@ cd "$(dirname "$0")"/..
 git submodule --quiet update --init
 cd third_party/closure-library && git checkout tags/v20201102 -f && cd ../..
 cd third_party/openssl && git checkout tags/OpenSSL_1_0_2h -f && cd ../..
-cd third_party/grpc && git checkout tags/v1.30.0 -f && \
+cd third_party/grpc && git checkout tags/v1.34.0 -f && \
   git submodule --quiet update --init && cd ../..
diff --git a/third_party/grpc b/third_party/grpc
index 9655f1f..64c6cfc 160000
--- a/third_party/grpc
+++ b/third_party/grpc
@@ -1 +1 @@
-Subproject commit 9655f1f6449dca36312489f9c82560c32050af71
+Subproject commit 64c6cfc791241fe4c4ecab41cb36d01cdddb3df4