diff --git a/requirements.txt b/requirements.txt
index f089555..6e5f872 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ opencv-python==4.1.0.25
 pbr==5.1.3
 Pillow==5.4.1
 pip-autoremove==0.9.1
-protobuf==3.7.0
+protobuf==3.18.3
 pyparsing==2.3.1
 python-dateutil==2.8.0
 PyWavelets==1.0.3
diff --git a/requirements_3.6.txt b/requirements_3.6.txt
index e131b6f..1950b73 100644
--- a/requirements_3.6.txt
+++ b/requirements_3.6.txt
@@ -16,7 +16,7 @@ numpy==1.16.2
 pbr==5.1.3
 Pillow==5.4.1
 pip-autoremove==0.9.1
-protobuf==3.7.0
+protobuf==3.18.3
 pyparsing==2.3.1
 python-dateutil==2.8.0
 scikit-learn==0.20.3