diff --git a/requirements.txt b/requirements.txt
index 5443bb2..aef29b4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ numpy>=1.16.2
 opencv-python==4.0.0.21
 pbr==5.1.3
 Pillow>=6.0.0
-protobuf==3.7.1
+protobuf==3.18.3
 pydicom==1.2.2
 pyparsing==2.3.1
 pypulseq==1.3.1.post1