diff --git a/requirements.txt b/requirements.txt
index a007fda..30e4018 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 pandas
 simplejson
-protobuf==3.5.1
+protobuf==3.18.3
 PyCryptodome
 
 
diff --git a/setup.py b/setup.py
index 93a98ae..a3f8e06 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@
 
 install_requires = ["pandas",
                     "simplejson",
-                    "protobuf==3.5.1",
+                    "protobuf==3.18.3",
                     "PyCryptodome",
                     ]