diff --git a/Dockerfile b/Dockerfile
index 4a6ecc0..bc3f488 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ 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 pip install matplotlib
 RUN apt install -y python-tk
 RUN git clone https://github.com/usnistgov/SCTK.git
 WORKDIR SCTK