diff --git a/intro-to-tflearn/requirements.txt b/intro-to-tflearn/requirements.txt
index 9f1e1ff962..9ddde9119f 100644
--- a/intro-to-tflearn/requirements.txt
+++ b/intro-to-tflearn/requirements.txt
@@ -31,7 +31,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==4.0.0
 prompt-toolkit==1.0.14
-protobuf==3.2.0
+protobuf==3.18.3
 ptyprocess==0.5.1
 Pygments==2.2.0
 pyparsing==2.2.0