diff --git a/CPU_Mac_Requirements.txt b/CPU_Mac_Requirements.txt
index 2b3f3d1..7c6a979 100644
--- a/CPU_Mac_Requirements.txt
+++ b/CPU_Mac_Requirements.txt
@@ -81,7 +81,7 @@ pillow==6.2.0
 pip==21.1
 prometheus_client==0.6.0
 prompt_toolkit==2.0.9
-protobuf==3.15.0
+protobuf==3.18.3
 prov==1.5.3
 ptyprocess==0.6.0
 pydot==1.4.1
diff --git a/GPU_Linux_Requirements.txt b/GPU_Linux_Requirements.txt
index 5c513bd..a7d8661 100644
--- a/GPU_Linux_Requirements.txt
+++ b/GPU_Linux_Requirements.txt
@@ -15,7 +15,7 @@ numpy==1.21.0
 pandas==0.23.4
 pbr==4.2.0
 Pillow==6.2.0
-protobuf==3.15.0
+protobuf==3.18.3
 pydicom==1.1.0
 python-dateutil==2.7.3
 pytz==2018.5