diff --git a/conda.yml b/conda.yml
index b1ca49c..5bd6dc8 100644
--- a/conda.yml
+++ b/conda.yml
@@ -26,12 +26,12 @@
       # This may speed up conda trying to match dependencies
       # TODO2: install all packages at once; this may speed up resolving dependencies
       loop:
-        - jupyterhub
-        - notebook
-        - jupyterlab
-        - sudospawner
-        - dockerspawner
-        - numpy
+        - jupyterhub = 1.1.0
+        - notebook = 6.0.3
+        - jupyterlab = 2.1.1
+        - sudospawner = 0.5.2
+        - dockerspawner = 0.11.1
+        - numpy = 1.18.1
 
     - file:
         path: /opt/conda
diff --git a/docker.yml b/docker.yml
index 4183530..4d38ad8 100644
--- a/docker.yml
+++ b/docker.yml
@@ -25,4 +25,4 @@
     state: started
 
 - name: Prepull the Docker image
-  shell: docker pull {{ docker_image }}
+  shell: docker pull -a eucp/notebook
diff --git a/docker_vars.yml b/docker_vars.yml
deleted file mode 100644
index d4edc30..0000000
--- a/docker_vars.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-#docker_image: jupyter/datascience-notebook:7a3e968dd212
-#docker_image: evertrol/eucp-notebook:64de3f568873
-#docker_image: evertrol/eucp-notebook:53286a2e9791
-#docker_image: evertrol/eucp-notebook:40e99d7fee5b
-#docker_image: evertrol/eucp-notebook:519eae90c305
-#docker_image: evertrol/eucp-notebook:2a0516105fa5
-#docker_image: evertrol/eucp-notebook:95611dde901d
-#docker_image: evertrol/eucp-notebook:70f2afbd0fb0
-#docker_image: evertrol/eucp-notebook:17be1b0bac70
-docker_image: evertrol/eucp-notebook:08eb66f14951
diff --git a/jupyterhub_config.py b/jupyterhub_config.py
index fc8ea4a..18f69e4 100644
--- a/jupyterhub_config.py
+++ b/jupyterhub_config.py
@@ -16,8 +16,12 @@
                            '/mnt/data/data1/thredds': {'bind': '/home/{username}/_data', 'mode': 'ro'},
                            '/mnt/data/data2/cordex-fpsc': {'bind': '/home/{username}/_cordex-fpsc', 'mode': 'ro'},
 }
-c.DockerSpawner.image = '{{ docker_image }}'
-
+# c.DockerSpawner.image = '{{ docker_image }}'
+c.DockerSpawner.image_whitelist = {'original': 'eucp/notebook:06af23e0e8b9',
+                                   'latest': 'eucp/notebook:latest',
+                                   '1.1.0': 'eucp/notebook:version-1.1.0',
+                                   '1.0.0': 'eucp/notebook:version-1.0.0',
+                                   }
 
 # Turn off; minimize non-essential warnings & errors in the logs
 c.PAMAuthenticator.open_sessions = False