diff --git a/java/requirements.txt b/java/requirements.txt
index 5cf1708..a4408bb 100644
--- a/java/requirements.txt
+++ b/java/requirements.txt
@@ -1,3 +1,3 @@
 mypy-protobuf==1.12
-protobuf==3.9.0
+protobuf==3.18.3
 six==1.12.0
diff --git a/setup.py b/setup.py
index a989e31..dc8eb85 100644
--- a/setup.py
+++ b/setup.py
@@ -77,7 +77,7 @@ def find_packages(self):
     install_requires=[
         'numpy>=1.6',
         'JPype1==0.7.0',
-        'protobuf==3.8.0',
+        'protobuf==3.18.3',
     ],
     # Need type hints
     # Should also work with lower, but needs to be tested