diff --git a/environment.yml b/environment.yml
index b56a17d..76761d2 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,6 +6,7 @@ dependencies:
   - jupyterhub-singleuser>=3.0,<4.0
   - python=3.8
   - nbgitpuller=1.1.*
+  - pip
   - git
   - numpy
   - scipy>=1.1
@@ -19,7 +20,3 @@ dependencies:
   - pip:
     - jupyter-server-proxy==3.2.2
     - aiohttp==3.8.4
-    - git+https://github.com/nmearl/hubbleds.git
-
-variables:
-  NODE_OPTIONS: --openssl-legacy-provider
diff --git a/postBuild b/postBuild
index bc3fed9..9aac606 100644
--- a/postBuild
+++ b/postBuild
@@ -1,2 +1,5 @@
 cp jupyter_config.json /etc/jupyter
-cat /etc/jupyter/jupyter_server_config_extra.py >> /etc/jupyter/jupyter_server_config.py
\ No newline at end of file
+cat /etc/jupyter/jupyter_server_config_extra.py >> /etc/jupyter/jupyter_server_config.py
+
+export NODE_OPTIONS=--openssl-legacy-provider
+pip install git+https://github.com/nmearl/hubbleds.git
\ No newline at end of file