diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index 9512fee507c855b8d7190789bee084918f97cca9..4ca74cb5c508dcbc5377a1d53b1ee1d673f3a22b 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -158,6 +158,7 @@ RUN cd /opt/spack-environment                                           \
                 --no-cache-dir                                          \
         ipython matplotlib scipy yapf pandas pycairo pyyaml lxml        \
         jupyter jupyterlab uproot pyunfold seaborn stashcp awkward      \
+        lmfit                                                           \
  && echo -n ""                                                          \
  && echo "Executing cmake patch for dd4hep 16.1"                        \                
  && sed -i "s/FIND_PACKAGE(Python/#&/" /usr/local/cmake/DD4hepBuild.cmake