diff --git a/requirements.txt b/requirements.txt
index c023822..b0c9d8d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,7 +48,7 @@ pickleshare==0.7.5
 pm4py==2.1.4
 pm4pycvxopt==0.0.10
 prompt-toolkit==3.0.2
-protobuf==3.11.2
+protobuf==3.15.0
 PuLP==2.0
 pyarrow==0.15.1
 pyasn1==0.4.8