diff --git a/python-3.7.6-0.build.sh b/python-3.7.6-0.build.sh
index 7874b45..9741975 100755
--- a/python-3.7.6-0.build.sh
+++ b/python-3.7.6-0.build.sh
@@ -227,9 +227,9 @@ rm -rf ${PREFIX}/lib/python$PYTHONVER/site-packages/OpenGL/Tk
 
 # pip3 install --prefix=$PREFIX HiCExplorer  # Would be a nice to have, but it likes to downgrade too much, pick some cherries
 pip3 install --prefix=$PREFIX HiCMatrix
-pip3 install --prefix=$PREFIX pyGenomeTracks
+pip3 install --prefix=$PREFIX pyGenomeTracks #downgrader cooler 0.8.7-> 0.8.5
 
-pip3 install --prefix=$PREFIX python-bioformats
+pip3 install --prefix=$PREFIX python-bioformats #downgrader matplotlib 3.2.0->3.1.1 docutils 0.16 -> 0.15.2
 
 pip3 install --prefix=$PREFIX jupyterlab      # request Peter Arndt
 pip3 install --prefix=$PREFIX jupyterlab-git