diff --git a/Dockerfile b/Dockerfile
index 0c352dd..0690c44 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,7 +20,6 @@ RUN \
         libressl \
         py3-lxml \
         py3-pip \
-        cython \
         python3 && \
     echo "**** install pip packages ****" && \
     pip3 install -U pip setuptools wheel && \
diff --git a/requirements.txt b/requirements.txt
index eebe848..65d4abd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 discord.py
 beautifulsoup4
-git+https://github.com/lxml/lxml@master#egg=lxml
+lxml