diff --git a/requirements.txt b/requirements.txt
index c76f334..1e0e97c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ nibabel==2.4.1
 numpy==1.16.4
 Pillow==8.2.0
 pkg-resources==0.0.0
-protobuf==3.9.0
+protobuf==3.18.3
 pyparsing==2.4.0
 python-dateutil==2.8.0
 PyWavelets==1.0.3