diff --git a/web/Dockerfile b/web/Dockerfile
index 9d5dae6..f62551b 100644
--- a/web/Dockerfile
+++ b/web/Dockerfile
@@ -5,7 +5,8 @@ RUN apt-get update && \
     apt-get install -y python3 python3-pip && \
     rm -rf /var/lib/apt/lists/*
 
-RUN apt-get install -y tree
+RUN apt-get update && \
+    apt-get install -y tree
 
 # Set working directory inside the container
 WORKDIR /usr/src/app