diff --git a/scripts/txtool/requirements.txt b/scripts/txtool/requirements.txt
index afbf9253..2d4e24c6 100644
--- a/scripts/txtool/requirements.txt
+++ b/scripts/txtool/requirements.txt
@@ -1,7 +1,7 @@
 jsonrpcclient[requests]==2.4.2
 py_solc==1.2.2
 simplejson==3.11.1
-protobuf==3.4.0
+protobuf==3.15.0
 pathlib==1.0.1
 ecdsa
 pysha3>=1.0.2