diff --git a/docker/Dockerfile b/docker/Dockerfile
index f2e0179..6894140 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -8,10 +8,8 @@ COPY demo.ipynb /test/
 
 # install M2
 USER root
-RUN apt-get update && apt-get install -y gnupg2
-RUN echo 'deb https://faculty.math.illinois.edu/Macaulay2/Repositories/Ubuntu bionic main' >/etc/apt/sources.list.d/macaulay2.list
-RUN wget http://www.math.uiuc.edu/Macaulay2/PublicKeys/Macaulay2-key
-RUN apt-key add Macaulay2-key
+RUN apt-get update && apt-get install -y software-properties-common
+RUN add-apt-repository ppa:macaulay2/macaulay2
 RUN apt-get update && apt-get install -y macaulay2
 
 # run jupyter notebook