diff --git a/Dockerfile b/Dockerfile
index 4a6ecc0..bc5460e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,9 +8,10 @@ RUN apt install -y git
 RUN apt install -y gcc
 RUN gcc --version
 RUN apt install -y build-essential
-RUN apt-get update && apt-get install -y python3
-RUN apt-get update && apt-get install -y python3-pip
-RUN pip3 install matplotlib
+RUN sudo apt-get update
+RUN sudo apt-get install python
+RUN sudo apt-get update && apt-get install -y python-pip
+RUN pip install matplotlib
 RUN apt install -y python-tk
 RUN git clone https://github.com/usnistgov/SCTK.git
 WORKDIR SCTK