diff --git a/Dockerfile b/Dockerfile
index 0a401c2..f4ed639 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -52,7 +52,7 @@ FROM oci.reg.darano.ir/mcr.microsoft.com/playwright:v1.62.0-noble AS worker
 # Install Python 3.12 + uv (the Playwright image has browsers but no Python).
 # Use a mirror for apt since the VPS has network restrictions (Iran).
 # curl is already installed (playwright system dep).
-RUN printf 'Types: deb\nURIs: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/\nSuites: noble noble-updates noble-security\nComponents: main restricted universe multiverse\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n' \
+RUN printf 'Types: deb\nURIs: http://repo.iut.ac.ir/ubuntu/\nSuites: noble noble-updates noble-security\nComponents: main restricted universe multiverse\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\n' \
       > /etc/apt/sources.list.d/ubuntu.sources \
     && apt-get update && apt-get install -y --no-install-recommends \
       python3 python3-venv \