diff --git a/.github/workflows/test-pr.yaml b/.github/workflows/test-pr.yaml
index 74aea250b..bb98480d9 100644
--- a/.github/workflows/test-pr.yaml
+++ b/.github/workflows/test-pr.yaml
@@ -37,9 +37,7 @@ jobs:
         
     - name: Installing Dependencies
       run: |
-        python3 -m pip install --upgrade pip
-        python3 -m pip install --upgrade pandocfilters jupyter
-        python3 -m pip install --upgrade -r requirements.txt
+        $CONDA/bin/conda env update --file environment.yml --name base
 
     
     - name: Generating notebooks
diff --git a/environment.yml b/environment.yml
index 62b85c0a0..a7ca22119 100644
--- a/environment.yml
+++ b/environment.yml
@@ -1,10 +1,11 @@
 name: binder-env
+channels:
+  - conda-forge
+  - bioconda
+  - openms
 dependencies:
-- python=3.10
-#- bioconda::pyopenms maybe not needed because we install it in a post-build event
-- pip
-
-- pip:
+  - python=3.10
+  - pyopenms
   - matplotlib
   - plotly
   - pandas
@@ -16,4 +17,6 @@ dependencies:
   - holoviews
   - pyviz_comms
   - jupyter-server-proxy
-  - massql
+  - pip
+  - pip:
+    - massql
diff --git a/postBuild b/postBuild
deleted file mode 100644
index d18037d92..000000000
--- a/postBuild
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-
-python3 -m pip install --index-url https://pypi.cs.uni-tuebingen.de/simple/ pyopenms
-
-# Those should be enabled by default on binder. For serving
-#jupyter serverextension enable --sys-prefix jupyter_server_proxy
-#jupyter labextension install @jupyterlab/server-proxy
-
-mkdir -p  ~/.jupyter/ && cp jupyter_notebook_config.py ~/.jupyter/