diff --git a/Dockerfile b/Dockerfile
index 7286c5cf36e9dac0be92d1d647eaf038cd8ec518..f670c8277aa43f9ab57bebd5a0495442b5aa3fa2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,10 +11,19 @@ ENV DEBIAN_FRONTEND noninteractive
 ENV DEBIAN_PRIORITY critical
 ENV DEBCONF_NOWARNINGS yes
 
+# Install apt-fast with patched ulimit
+RUN \
+  ulimit -n 10000 && \
+  apt-get update && \
+  apt-get -y install aria2 && \
+  curl -s https://raw.githubusercontent.com/ilikenwf/apt-fast/master/apt-fast -o /usr/local/bin/apt-fast && \
+  sed -i '/^#!\/bin\/bash/aulimit -n 10000' /usr/local/bin/apt-fast && \
+  chmod 755 /usr/local/bin/apt-fast
+
 # Upgrade packages
 RUN \
-  apt-get -y update && \
-  apt-get -y upgrade
+  apt-fast update && \
+  apt-fast -y upgrade
 
 # Set Timezone
 RUN \