diff --git a/Dockerfile b/Dockerfile
index e722b25..5cef3c0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,6 @@ RUN apt-get update && \
     apt-get -y install libncurses5-dev libncursesw5-dev libncurses5
 
 RUN pip install --no-cache-dir masspy==0.1.7
-RUN pip uninstall numpy
-RUN pip install numpy==1.13
+RUN pip install --upgrade numpy==1.13
 
 USER jovyan