diff --git a/SENET/requirement.txt b/SENET/requirement.txt
index 21554873..5e970d29 100644
--- a/SENET/requirement.txt
+++ b/SENET/requirement.txt
@@ -42,7 +42,7 @@ pathlib==1.0.1
 pdfminer.six==20170720
 plac==0.9.6
 preshed==1.0.0
-protobuf==3.4.0
+protobuf==3.15.0
 pyasn1==0.3.7
 pyasn1-modules==0.1.5
 pycryptodome==3.4.7
diff --git a/SENET/src/requirement.txt b/SENET/src/requirement.txt
index 21554873..5e970d29 100644
--- a/SENET/src/requirement.txt
+++ b/SENET/src/requirement.txt
@@ -42,7 +42,7 @@ pathlib==1.0.1
 pdfminer.six==20170720
 plac==0.9.6
 preshed==1.0.0
-protobuf==3.4.0
+protobuf==3.15.0
 pyasn1==0.3.7
 pyasn1-modules==0.1.5
 pycryptodome==3.4.7