diff --git a/src/text2graph/requirements.txt b/src/text2graph/requirements.txt
index fd19de4bc..5285b47ed 100644
--- a/src/text2graph/requirements.txt
+++ b/src/text2graph/requirements.txt
@@ -70,7 +70,7 @@ plac==0.9.6
 preshed==2.0.1
 prometheus-client==0.6.0
 prompt-toolkit==2.0.9
-protobuf==3.6.1
+protobuf==3.18.3
 psutil==5.5.0
 ptyprocess==0.6.0
 pycodestyle==2.5.0