diff --git a/code/NPI/pytorch/requirements.txt b/code/NPI/pytorch/requirements.txt
index ac78cdd..ba059d0 100644
--- a/code/NPI/pytorch/requirements.txt
+++ b/code/NPI/pytorch/requirements.txt
@@ -46,7 +46,7 @@ Pillow==5.2.0
 pipeproxy==0.7
 plac==0.9.6
 preshed==2.0.1
-protobuf==3.6.0
+protobuf==3.15.0
 pycosat==0.6.3
 pycparser==2.18
 pyOpenSSL==18.0.0