diff --git a/src/model_converters/mmdnn_converter/requirements.txt b/src/model_converters/mmdnn_converter/requirements.txt
index d6691bab0..d1ef1bf88 100644
--- a/src/model_converters/mmdnn_converter/requirements.txt
+++ b/src/model_converters/mmdnn_converter/requirements.txt
@@ -4,7 +4,7 @@ wget==3.2
 numpy==1.18.2
 scipy==1.4.1
 scikit-image==0.16.2
-protobuf==3.11.3
+protobuf==5.29.6
 pillow==6.2.2
 tensorflow==1.15.2
 keras==2.2.4