diff --git a/Dockerfile b/Dockerfile
index bf4c5e9..bf93d70 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -113,7 +113,7 @@ RUN cd zdns && /usr/local/go/bin/go build
 
 # To allow run knockpy the docker
 RUN git clone https://github.com/guelfoweb/knock
-RUN cd knock && python3 setup.py install
+RUN cd knock && pip3 install -r requirements.txt
 
 # To allow run Massdns inside the docker
 RUN git clone https://github.com/blechschmidt/massdns.git && cd massdns && make