diff --git a/project_2-automatic_image_captioning/requirements.txt b/project_2-automatic_image_captioning/requirements.txt
index ecb553e..e001e96 100644
--- a/project_2-automatic_image_captioning/requirements.txt
+++ b/project_2-automatic_image_captioning/requirements.txt
@@ -108,7 +108,7 @@ pinyin==0.4.0
 plotly==2.0.15
 pomegranate==0.9.0
 prompt-toolkit==1.0.15
-protobuf==3.5.1
+protobuf==3.18.3
 psutil==5.4.0
 ptyprocess==0.5.2
 py4j==0.10.6