diff --git a/examples/DPU-for-RNN/rnnt_asr_vck5000/requirements.txt b/examples/DPU-for-RNN/rnnt_asr_vck5000/requirements.txt
old mode 100755
new mode 100644
index afdc57bbf..e40db3b15
--- a/examples/DPU-for-RNN/rnnt_asr_vck5000/requirements.txt
+++ b/examples/DPU-for-RNN/rnnt_asr_vck5000/requirements.txt
@@ -63,7 +63,7 @@ plaster==1.0
 plaster-pastedeploy==0.7
 prettytable==2.0.0
 prompt-toolkit==3.0.7
-protobuf==3.11.3
+protobuf==3.18.3
 ptyprocess==0.6.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8