diff --git a/stage4/12-pisdr-gnuradio/00-packages-nr b/stage4/12-pisdr-gnuradio/00-packages-nr
index 6d51f2f..1e3a96a 100644
--- a/stage4/12-pisdr-gnuradio/00-packages-nr
+++ b/stage4/12-pisdr-gnuradio/00-packages-nr
@@ -19,6 +19,7 @@ libqwt-qt5-dev
 libqt5opengl5-dev
 libcodec2-dev
 pybind11-dev
+libsndfile1-dev
 
 python3-numpy
 python3-mako
@@ -32,3 +33,4 @@ python3-zmq
 python3-scipy
 python3-pip
 python3-gi-cairo
+python3-matplotlib