diff --git a/jupyterhub_config.py b/jupyterhub_config.py
index 8f4ee9e..cba288f 100755
--- a/jupyterhub_config.py
+++ b/jupyterhub_config.py
@@ -76,7 +76,7 @@ spawn_cmd = os.environ.get('DOCKER_SPAWN_CMD', "start-singleuser.sh")
 c.DockerSpawner.extra_create_kwargs.update({ 'command': spawn_cmd })
 
 # Memory limit
-c.Spawner.mem_limit = '2G'  # RAM limit
+c.Spawner.mem_limit = '50G'  # RAM limit
 c.Spawner.cpu_limit = 0.0001
 
 # Connect containers to this Docker network
diff --git a/singleuser/Dockerfile b/singleuser/Dockerfile
index 1ad2418..5ae993c 100755
--- a/singleuser/Dockerfile
+++ b/singleuser/Dockerfile
@@ -13,16 +13,18 @@ RUN apt-get update && \
     htop \
     fonts-dejavu \
     tzdata \
-    gfortran \
-    gcc
+    gfortran
+
+RUN apt-get install -y gcc
+
 # finish off with MPI dependencies
-RUN sudo apt-get install mpich libmpich-dev && \
-     rm -rf /var/lib/apt/lists/*
+RUN sudo apt-get install mpich libmpich-dev -y && \
+    rm -rf /var/lib/apt/lists/*
 
 USER jovyan
 
 RUN python3 -m pip install --no-cache jupyterhub==$JUPYTERHUB_VERSION nbresuse 
-RUN conda install -c conda-forge fenics
+#RUN conda install -c conda-forge fenics
 
 RUN python3 -m pip install ipyparallel mpi4py
 RUN ipython profile create --parallel --profile=mpi