diff --git a/docker/ci/ubuntu/Dockerfile b/docker/ci/ubuntu/Dockerfile
index 8907cf624c..d11746cf3a 100644
--- a/docker/ci/ubuntu/Dockerfile
+++ b/docker/ci/ubuntu/Dockerfile
@@ -1,5 +1,8 @@
 FROM ubuntu:22.04
 
+# The root path under which contains all the dependencies to build this Dockerfile.
+ARG DOCKER_BUILD_ROOT=.
+
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     ca-certificates \
     python3.10 \
@@ -7,7 +10,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     python3-pip \
     curl
 
-COPY ./docker/python/requirements.txt /etc/greptime/requirements.txt
+COPY $DOCKER_BUILD_ROOT/docker/python/requirements.txt /etc/greptime/requirements.txt
 
 RUN python3 -m pip install -r /etc/greptime/requirements.txt