diff --git a/Dockerfile b/Dockerfile
index 9b6b59c..86001a2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,8 @@ RUN apt install -y gcc
 RUN gcc --version
 RUN apt install -y build-essential
 RUN git clone https://github.com/usnistgov/SCTK.git
+RUN apt-get update && \
+    apt-get install -y gnuplot5
 WORKDIR SCTK
 RUN make config && make all && make check &&  make install && make doc
 ENV PATH=$PATH:/SCTK/bin
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