diff --git a/3rdparty/protobuf/README.md b/3rdparty/protobuf/README.md
index 6c5b6396d2..e0edb75f58 100644
--- a/3rdparty/protobuf/README.md
+++ b/3rdparty/protobuf/README.md
@@ -1,3 +1,3 @@
 Project: Protocol Buffers - Google's data interchange format
 Source code: https://github.com/google/protobuf
-Version: 3.1.0
+Version: 3.5.1