diff --git a/requirements.txt b/requirements.txt
index 1593ce5..b0cbd5a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,5 @@ pyevtk==1.1.1
 flask==1.1.2
 requests==2.25.0
 torch>=1.7.1
-networkx==2.5.1
\ No newline at end of file
+networkx==2.5.1
+protobuf~=3.20
\ No newline at end of file