diff --git a/nwx_build_environment/nwx_buildenv.dockerfile b/nwx_build_environment/nwx_buildenv.dockerfile
index 211e842..7da18af 100644
--- a/nwx_build_environment/nwx_buildenv.dockerfile
+++ b/nwx_build_environment/nwx_buildenv.dockerfile
@@ -22,7 +22,7 @@ RUN apt-get update \
     libxml2-dev \
     libxslt-dev \
     nwchem \
-    && pip install gcovr numpy qcelemental qcengine networkx \
+    && pip install gcovr numpy qcelemental qcengine networkx ase \
     && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 COPY toolchains /toolchains