diff --git a/third_party/nanopb b/third_party/nanopb
index 5497a1dfc91a86965383cdd1652e348345400435..f8ac463766281625ad710900479130c7fcb4d63b 160000
--- a/third_party/nanopb
+++ b/third_party/nanopb
@@ -1 +1 @@
-Subproject commit 5497a1dfc91a86965383cdd1652e348345400435
+Subproject commit f8ac463766281625ad710900479130c7fcb4d63b
diff --git a/tools/run_tests/sanity/check_submodules.sh b/tools/run_tests/sanity/check_submodules.sh
index c08b382638fbd4f4e14be9be6f67dfd262301b88..3c6dbb9ea1f1a18f51b33c8d889c901496d12153 100755
--- a/tools/run_tests/sanity/check_submodules.sh
+++ b/tools/run_tests/sanity/check_submodules.sh
@@ -44,7 +44,7 @@ cat << EOF | awk '{ print $1 }' | sort > $want_submodules
  9f897b25800d2f54f5c442ef01a60721aeca6d87 third_party/boringssl (version_for_cocoapods_1.0-67-g9f897b2)
  05b155ff59114735ec8cd089f669c4c3d8f59029 third_party/gflags (v2.1.0-45-g05b155f)
  c99458533a9b4c743ed51537e25989ea55944908 third_party/googletest (release-1.7.0)
- 5497a1dfc91a86965383cdd1652e348345400435 third_party/nanopb (nanopb-0.3.3-10-g5497a1d)
+ f8ac463766281625ad710900479130c7fcb4d63b third_party/nanopb (nanopb-0.3.4-29-gf8ac463)
  d5fb408ddc281ffcadeb08699e65bb694656d0bd third_party/protobuf (v3.0.0-beta-2)
  50893291621658f355bc5b4d450a8d06a563053d third_party/zlib (v1.2.8)
 EOF