--- a/makefiles/Makefile.third_party.unix.mk
+++ b/makefiles/Makefile.third_party.unix.mk
@@ -24,1 +24,1 @@ GLOG_TAG = 0.4.0
-PROTOBUF_TAG = 3.9.0
+PROTOBUF_TAG = 3.7.0
--- a/makefiles/Makefile.third_party.win.mk
+++ b/makefiles/Makefile.third_party.win.mk
@@ -40 +40 @@ GLOG_TAG = 0.4.0
-PROTOBUF_TAG = 3.9.0
+PROTOBUF_TAG = 3.7.0