diff --git a/requirements.txt b/requirements.txt
index fbac8ea..012dd14 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ networkx==2.3
 numpy==1.17.1
 opencv-python==4.1.0.25
 Pillow-SIMD==6.0.0.post0
-protobuf==3.9.1
+protobuf==3.15.0
 pyparsing==2.4.2
 python-dateutil==2.8.0
 PyWavelets==1.0.3