diff --git a/repo2docker/buildpacks/conda/environment.lock b/repo2docker/buildpacks/conda/environment.lock
index 13528f204..acff02672 100644
--- a/repo2docker/buildpacks/conda/environment.lock
+++ b/repo2docker/buildpacks/conda/environment.lock
@@ -1,140 +1,147 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2022-01-26 18:35:40 UTC
+# Frozen on 2022-04-08 20:32:01 UTC
 # Generated by conda-lock.
 # platform: linux-64
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.lock b/repo2docker/buildpacks/conda/environment.py-3.7.lock
index 13528f204..acff02672 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.lock
@@ -1,140 +1,147 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.yml b/repo2docker/buildpacks/conda/environment.py-3.7.yml
index 69bc0ae13..9846049ad 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,19 +1,15 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2022-01-26 18:34:43 UTC
+# Generated on 2022-04-08 20:31:14 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.7.*
 - nodejs=14
 - pip
-- ipywidgets==7.6.5
+- ipywidgets==7.7.0
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.6.1
-- jupyterlab==3.2.8
-  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
-- jupyterhub-singleuser==1.4.2
-  # Newer versions require python 3.7
-- nbconvert==6.0.7
-  # 6.4.0 conda package requires python 3.7
-- notebook==6.3.0
+- jupyterlab==3.3.3
+- jupyterhub-singleuser==1.5.0
+- notebook==6.4.10
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.8.lock b/repo2docker/buildpacks/conda/environment.py-3.8.lock
index b3deb7845..bec50032e 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.8.lock
@@ -1,152 +1,152 @@
 # AUTO GENERATED FROM environment.py-3.8.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2022-01-26 18:36:36 UTC
+# Frozen on 2022-04-08 20:32:28 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 76e94579a1728608e8c93f5df71d7f564ac6a98a6b3e770fdb3cc24ed7d034c0
+# input_hash: 6746609e36e6046a8fc2e535cb79682b985fd253adfbcb7dde767516a816649c
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.8.yml b/repo2docker/buildpacks/conda/environment.py-3.8.yml
index aa1b19507..dd1f080a8 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.8.yml
@@ -1,19 +1,15 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2022-01-26 18:35:40 UTC
+# Generated on 2022-04-08 20:32:01 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.8.*
 - nodejs=14
 - pip
-- ipywidgets==7.6.5
+- ipywidgets==7.7.0
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.6.1
-- jupyterlab==3.2.8
-  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
-- jupyterhub-singleuser==1.4.2
-  # Newer versions require python 3.7
-- nbconvert==6.0.7
-  # 6.4.0 conda package requires python 3.7
-- notebook==6.3.0
+- jupyterlab==3.3.3
+- jupyterhub-singleuser==1.5.0
+- notebook==6.4.10
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9.lock b/repo2docker/buildpacks/conda/environment.py-3.9.lock
index aedba8895..f2bb487c8 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.9.lock
@@ -1,155 +1,152 @@
 # AUTO GENERATED FROM environment.py-3.9.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2022-01-26 18:37:30 UTC
+# Frozen on 2022-04-08 20:32:53 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 26314177814dc09ebdfe9ad8cd35b257ebec964ae6e21918e0bfb7bf38675075
+# input_hash: 5ee8053b92242211d3e7cc3cbe22a449dd66866634a202aea18ce2295ad1c74f
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-https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml-0.17.19-py39h3811e60_0.tar.bz2#5e50592662d6b781b7c42fdb4c434e83
-https://conda.anaconda.org/conda-forge/linux-64/sqlalchemy-1.4.31-py39h3811e60_0.tar.bz2#16995a401ab29510c6e7665c9aff030f
-https://conda.anaconda.org/conda-forge/noarch/stack_data-0.1.4-pyhd8ed1ab_0.tar.bz2#e68dcab1b415c3c44be2a51d7d41e921
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-https://conda.anaconda.org/conda-forge/noarch/alembic-1.7.5-pyhd8ed1ab_0.tar.bz2#1102908123392ffc63c01caea136b1d4
+https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml-0.17.21-py39hb9d737c_1.tar.bz2#2b94cf785616198b112170b9838262a4
+https://conda.anaconda.org/conda-forge/linux-64/sqlalchemy-1.4.35-py39hb9d737c_0.tar.bz2#aba3f9a2c924f9b91dbc45ed727b1985
+https://conda.anaconda.org/conda-forge/noarch/stack_data-0.2.0-pyhd8ed1ab_0.tar.bz2#8c0ce3e6bf18a0c810125aef58a2a6f3
+https://conda.anaconda.org/conda-forge/linux-64/terminado-0.13.3-py39hf3d152e_1.tar.bz2#bebf6da1adb04ed902ff335e61438a6e
+https://conda.anaconda.org/conda-forge/noarch/alembic-1.7.7-pyhd8ed1ab_0.tar.bz2#9637550104fade18bc6f91aef1f4f02c
 https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-21.3.0-pyhd8ed1ab_0.tar.bz2#a0b402db58f73aaab8ee0ca1025a362e
 https://conda.anaconda.org/conda-forge/noarch/jupyter_telemetry-0.1.0-pyhd8ed1ab_1.tar.bz2#bb9ebdb6d5aa2622484aff1faceee181
-https://conda.anaconda.org/conda-forge/noarch/jupyterlab_pygments-0.1.2-pyh9f0ad1d_0.tar.bz2#2cbd910890bb328e8959246a1e16fac7
-https://conda.anaconda.org/conda-forge/noarch/nbformat-5.1.3-pyhd8ed1ab_0.tar.bz2#bafa5df6d4f8db69a4d197b4657127e7
-https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.1.1-pyhd8ed1ab_0.tar.bz2#34bb0b023e083aa8a4af74311031a352
-https://conda.anaconda.org/conda-forge/noarch/pyopenssl-21.0.0-pyhd8ed1ab_0.tar.bz2#8c49efecb7dca466e18b06015e8c88ce
+https://conda.anaconda.org/conda-forge/noarch/jupyterlab_pygments-0.2.0-pyhd8ed1ab_0.tar.bz2#e7f2d7ae0fb2127a49f90fd8258aab57
+https://conda.anaconda.org/conda-forge/noarch/nbformat-5.3.0-pyhd8ed1ab_0.tar.bz2#58aa1c75de50004c46a0526d7a28c88e
+https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.2.0-pyhd8ed1ab_0.tar.bz2#ecc95c82c788737d6d33f5d564566d89
+https://conda.anaconda.org/conda-forge/noarch/pyopenssl-22.0.0-pyhd8ed1ab_0.tar.bz2#1d7e241dfaf5475e893d4b824bb71b44
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+https://conda.anaconda.org/conda-forge/noarch/nbconvert-core-6.4.5-pyhd8ed1ab_2.tar.bz2#b9bda22f3d1020336202f0583bb2b390
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-https://conda.anaconda.org/conda-forge/noarch/jupyter_server-1.13.4-pyhd8ed1ab_0.tar.bz2#70c6e1f755731d858767cb3c08c56a95
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-https://conda.anaconda.org/conda-forge/linux-64/widgetsnbextension-3.5.2-py39hf3d152e_1.tar.bz2#26c83eb2efd87c9bbef958b9f7117559
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+https://conda.anaconda.org/conda-forge/noarch/ipywidgets-7.7.0-pyhd8ed1ab_0.tar.bz2#a3d2ccd3d9f9fcb65765c22f500529b4
+https://conda.anaconda.org/conda-forge/noarch/jupyterlab-3.3.3-pyhd8ed1ab_0.tar.bz2#e4a80ef512d3c9d85df95a8623f8b1c8
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9.yml b/repo2docker/buildpacks/conda/environment.py-3.9.yml
index fa80fb7a8..103d7d62c 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.9.yml
@@ -1,19 +1,15 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2022-01-26 18:36:36 UTC
+# Generated on 2022-04-08 20:32:28 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.9.*
 - nodejs=14
 - pip
-- ipywidgets==7.6.5
+- ipywidgets==7.7.0
 - jupyter-offlinenotebook==0.2.2
 - jupyter-resource-usage==0.6.1
-- jupyterlab==3.2.8
-  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
-- jupyterhub-singleuser==1.4.2
-  # Newer versions require python 3.7
-- nbconvert==6.0.7
-  # 6.4.0 conda package requires python 3.7
-- notebook==6.3.0
+- jupyterlab==3.3.3
+- jupyterhub-singleuser==1.5.0
+- notebook==6.4.10
 - nteract_on_jupyter==2.1.3
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index 218ccc1f6..c7c6ff5e2 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -4,14 +4,10 @@ dependencies:
   - python=3.7
   - nodejs=14
   - pip
-  - ipywidgets==7.6.5
+  - ipywidgets==7.7.0
   - jupyter-offlinenotebook==0.2.2
   - jupyter-resource-usage==0.6.1
-  - jupyterlab==3.2.8
-  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
-  - jupyterhub-singleuser==1.4.2
-  # Newer versions require python 3.7
-  - nbconvert==6.0.7
-  # 6.4.0 conda package requires python 3.7
-  - notebook==6.3.0
+  - jupyterlab==3.3.3
+  - jupyterhub-singleuser==1.5.0
+  - notebook==6.4.10
   - nteract_on_jupyter==2.1.3