diff --git a/repo2docker/buildpacks/conda/environment.frozen.yml b/repo2docker/buildpacks/conda/environment.frozen.yml
index eda33f89..19c0dad6 100644
--- a/repo2docker/buildpacks/conda/environment.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2019-03-23 18:02:15 UTC
+# Frozen on 2019-04-24 18:01:25 UTC
 name: r2d
 channels:
   - conda-forge
@@ -20,7 +20,7 @@ dependencies:
   - ipython_genutils=0.2.0=py_1
   - ipywidgets=7.4.2=py_0
   - jedi=0.13.3=py37_0
-  - jinja2=2.10=py_1
+  - jinja2=2.10.1=py_0
   - jsonschema=3.0.1=py37_0
   - jupyter_client=5.2.4=py_3
   - jupyter_core=4.4.0=py_0
@@ -33,54 +33,54 @@ dependencies:
   - nbconvert=5.4.1=py_2
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hf484d3e_1002
-  - notebook=5.7.6=py37_0
+  - notebook=5.7.8=py37_0
   - openssl=1.1.1b=h14c3975_1
-  - pandoc=2.7.1=0
+  - pandoc=2.7.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.4=py_0
-  - pexpect=4.6.0=py37_1000
+  - parso=0.4.0=py_0
+  - pexpect=4.7.0=py37_0
   - pickleshare=0.7.5=py37_1000
-  - pip=19.0.3=py37_0
+  - pip=19.1=py37_0
   - prometheus_client=0.6.0=py_0
   - prompt_toolkit=2.0.9=py_0
-  - ptyprocess=0.6.0=py37_1000
+  - ptyprocess=0.6.0=py_1001
   - pygments=2.3.1=py_0
   - pyrsistent=0.14.11=py37h14c3975_0
-  - python=3.7.2=h381d211_0
+  - python=3.7.3=h5b0a415_0
   - python-dateutil=2.8.0=py_0
-  - pyzmq=18.0.1=py37h0e1adb2_0
+  - pyzmq=18.0.1=py37hc4ba49a_1
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.8.0=py37_0
+  - setuptools=41.0.1=py37_0
   - six=1.12.0=py37_1000
   - sqlite=3.26.0=h67949de_1001
-  - terminado=0.8.1=py37_1001
+  - terminado=0.8.2=py37_0
   - testpath=0.4.2=py_1001
-  - tk=8.6.9=h84994c4_1000
-  - tornado=6.0.1=py37h14c3975_0
+  - tk=8.6.9=h84994c4_1001
+  - tornado=6.0.2=py37h516909a_0
   - traitlets=4.3.2=py37_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
   - wheel=0.33.1=py37_0
   - widgetsnbextension=3.4.2=py37_1000
   - xz=5.2.4=h14c3975_1001
-  - zeromq=4.2.5=hf484d3e_1006
+  - zeromq=4.3.1=hf484d3e_1000
   - zlib=1.2.11=h14c3975_1004
   - libgcc-ng=8.2.0=hdf63c60_1
   - libstdcxx-ng=8.2.0=hdf63c60_1
   - pip:
-    - alembic==1.0.8
+    - alembic==1.0.9
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.8
     - jupyterhub==0.9.4
-    - mako==1.0.8
-    - nteract-on-jupyter==2.0.0
+    - mako==1.0.9
+    - nteract-on-jupyter==2.0.12
     - pamela==1.0.0
     - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
-    - sqlalchemy==1.3.1
-    - urllib3==1.24.1
+    - sqlalchemy==1.3.3
+    - urllib3==1.24.2
 prefix: /opt/conda/envs/r2d
 
diff --git a/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml
index e7c3e8e5..1c74fe08 100644
--- a/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-2.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2019-03-23 17:59:14 UTC
+# Frozen on 2019-04-24 17:58:08 UTC
 name: r2d
 channels:
   - conda-forge
@@ -24,28 +24,28 @@ dependencies:
   - ncurses=6.1=hf484d3e_1002
   - openssl=1.1.1b=h14c3975_1
   - pathlib2=2.3.3=py27_1000
-  - pexpect=4.6.0=py27_1000
+  - pexpect=4.7.0=py27_0
   - pickleshare=0.7.5=py27_1000
-  - pip=19.0.3=py27_0
+  - pip=19.1=py27_0
   - prompt_toolkit=1.0.15=py_1
-  - ptyprocess=0.6.0=py27_1000
+  - ptyprocess=0.6.0=py_1001
   - pygments=2.3.1=py_0
   - python=2.7.15=h721da81_1008
   - python-dateutil=2.8.0=py_0
-  - pyzmq=18.0.1=py27h0e1adb2_0
+  - pyzmq=18.0.1=py27hc4ba49a_1
   - readline=7.0=hf8c457e_1001
   - scandir=1.10.0=py27h14c3975_0
-  - setuptools=40.8.0=py27_0
+  - setuptools=41.0.1=py27_0
   - simplegeneric=0.8.1=py_1
   - singledispatch=3.4.0.3=py27_1000
   - six=1.12.0=py27_1000
   - sqlite=3.26.0=h67949de_1001
-  - tk=8.6.9=h84994c4_1000
+  - tk=8.6.9=h84994c4_1001
   - tornado=5.1.1=py27h14c3975_1000
   - traitlets=4.3.2=py27_1000
   - wcwidth=0.1.7=py_1
   - wheel=0.33.1=py27_0
-  - zeromq=4.2.5=hf484d3e_1006
+  - zeromq=4.3.1=hf484d3e_1000
   - zlib=1.2.11=h14c3975_1004
   - libgcc-ng=8.2.0=hdf63c60_1
   - libstdcxx-ng=8.2.0=hdf63c60_1
diff --git a/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
index 97d21c50..7aa3aea3 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
@@ -75,7 +75,7 @@ dependencies:
     - idna==2.7
     - jupyterhub==0.9.4
     - mako==1.0.7
-    - notebook==5.7.6
+    - notebook==5.7.8
     - nteract-on-jupyter==1.9.6
     - pamela==0.3.0
     - python-editor==1.0.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml
index b57680a8..745375ae 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-3.6.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2019-03-23 18:00:20 UTC
+# Frozen on 2019-04-24 17:59:15 UTC
 name: r2d
 channels:
   - conda-forge
@@ -19,7 +19,7 @@ dependencies:
   - ipython_genutils=0.2.0=py_1
   - ipywidgets=7.4.2=py_0
   - jedi=0.13.3=py36_0
-  - jinja2=2.10=py_1
+  - jinja2=2.10.1=py_0
   - jsonschema=3.0.1=py36_0
   - jupyter_client=5.2.4=py_3
   - jupyter_core=4.4.0=py_0
@@ -32,54 +32,54 @@ dependencies:
   - nbconvert=5.4.1=py_2
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hf484d3e_1002
-  - notebook=5.7.6=py36_0
+  - notebook=5.7.8=py36_0
   - openssl=1.1.1b=h14c3975_1
-  - pandoc=2.7.1=0
+  - pandoc=2.7.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.4=py_0
-  - pexpect=4.6.0=py36_1000
+  - parso=0.4.0=py_0
+  - pexpect=4.7.0=py36_0
   - pickleshare=0.7.5=py36_1000
-  - pip=19.0.3=py36_0
+  - pip=19.1=py36_0
   - prometheus_client=0.6.0=py_0
   - prompt_toolkit=2.0.9=py_0
-  - ptyprocess=0.6.0=py36_1000
+  - ptyprocess=0.6.0=py_1001
   - pygments=2.3.1=py_0
   - pyrsistent=0.14.11=py36h14c3975_0
   - python=3.6.7=h381d211_1004
   - python-dateutil=2.8.0=py_0
-  - pyzmq=18.0.1=py36h0e1adb2_0
+  - pyzmq=18.0.1=py36hc4ba49a_1
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.8.0=py36_0
+  - setuptools=41.0.1=py36_0
   - six=1.12.0=py36_1000
   - sqlite=3.26.0=h67949de_1001
-  - terminado=0.8.1=py36_1001
+  - terminado=0.8.2=py36_0
   - testpath=0.4.2=py_1001
-  - tk=8.6.9=h84994c4_1000
-  - tornado=6.0.1=py36h14c3975_0
+  - tk=8.6.9=h84994c4_1001
+  - tornado=6.0.2=py36h516909a_0
   - traitlets=4.3.2=py36_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
   - wheel=0.33.1=py36_0
   - widgetsnbextension=3.4.2=py36_1000
   - xz=5.2.4=h14c3975_1001
-  - zeromq=4.2.5=hf484d3e_1006
+  - zeromq=4.3.1=hf484d3e_1000
   - zlib=1.2.11=h14c3975_1004
   - libgcc-ng=8.2.0=hdf63c60_1
   - libstdcxx-ng=8.2.0=hdf63c60_1
   - pip:
-    - alembic==1.0.8
+    - alembic==1.0.9
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.8
     - jupyterhub==0.9.4
-    - mako==1.0.8
-    - nteract-on-jupyter==2.0.0
+    - mako==1.0.9
+    - nteract-on-jupyter==2.0.12
     - pamela==1.0.0
     - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
-    - sqlalchemy==1.3.1
-    - urllib3==1.24.1
+    - sqlalchemy==1.3.3
+    - urllib3==1.24.2
 prefix: /opt/conda/envs/r2d
 
diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.yml b/repo2docker/buildpacks/conda/environment.py-3.6.yml
index 5fa071c3..5aef274a 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.6.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.6.yml
@@ -1,11 +1,11 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2019-03-23 18:00:20 UTC
+# Generated on 2019-04-24 17:59:15 UTC
 dependencies:
 - python=3.6.*
 - ipywidgets==7.4.2
 - jupyterlab==0.35.4
 - nbconvert==5.4.1
-- notebook==5.7.6
+- notebook==5.7.8
 - pip:
-  - nteract_on_jupyter==2.0.0
+  - nteract_on_jupyter==2.0.12
   - jupyterhub==0.9.4
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml
index eda33f89..19c0dad6 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2019-03-23 18:02:15 UTC
+# Frozen on 2019-04-24 18:01:25 UTC
 name: r2d
 channels:
   - conda-forge
@@ -20,7 +20,7 @@ dependencies:
   - ipython_genutils=0.2.0=py_1
   - ipywidgets=7.4.2=py_0
   - jedi=0.13.3=py37_0
-  - jinja2=2.10=py_1
+  - jinja2=2.10.1=py_0
   - jsonschema=3.0.1=py37_0
   - jupyter_client=5.2.4=py_3
   - jupyter_core=4.4.0=py_0
@@ -33,54 +33,54 @@ dependencies:
   - nbconvert=5.4.1=py_2
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hf484d3e_1002
-  - notebook=5.7.6=py37_0
+  - notebook=5.7.8=py37_0
   - openssl=1.1.1b=h14c3975_1
-  - pandoc=2.7.1=0
+  - pandoc=2.7.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.4=py_0
-  - pexpect=4.6.0=py37_1000
+  - parso=0.4.0=py_0
+  - pexpect=4.7.0=py37_0
   - pickleshare=0.7.5=py37_1000
-  - pip=19.0.3=py37_0
+  - pip=19.1=py37_0
   - prometheus_client=0.6.0=py_0
   - prompt_toolkit=2.0.9=py_0
-  - ptyprocess=0.6.0=py37_1000
+  - ptyprocess=0.6.0=py_1001
   - pygments=2.3.1=py_0
   - pyrsistent=0.14.11=py37h14c3975_0
-  - python=3.7.2=h381d211_0
+  - python=3.7.3=h5b0a415_0
   - python-dateutil=2.8.0=py_0
-  - pyzmq=18.0.1=py37h0e1adb2_0
+  - pyzmq=18.0.1=py37hc4ba49a_1
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.8.0=py37_0
+  - setuptools=41.0.1=py37_0
   - six=1.12.0=py37_1000
   - sqlite=3.26.0=h67949de_1001
-  - terminado=0.8.1=py37_1001
+  - terminado=0.8.2=py37_0
   - testpath=0.4.2=py_1001
-  - tk=8.6.9=h84994c4_1000
-  - tornado=6.0.1=py37h14c3975_0
+  - tk=8.6.9=h84994c4_1001
+  - tornado=6.0.2=py37h516909a_0
   - traitlets=4.3.2=py37_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
   - wheel=0.33.1=py37_0
   - widgetsnbextension=3.4.2=py37_1000
   - xz=5.2.4=h14c3975_1001
-  - zeromq=4.2.5=hf484d3e_1006
+  - zeromq=4.3.1=hf484d3e_1000
   - zlib=1.2.11=h14c3975_1004
   - libgcc-ng=8.2.0=hdf63c60_1
   - libstdcxx-ng=8.2.0=hdf63c60_1
   - pip:
-    - alembic==1.0.8
+    - alembic==1.0.9
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.8
     - jupyterhub==0.9.4
-    - mako==1.0.8
-    - nteract-on-jupyter==2.0.0
+    - mako==1.0.9
+    - nteract-on-jupyter==2.0.12
     - pamela==1.0.0
     - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
-    - sqlalchemy==1.3.1
-    - urllib3==1.24.1
+    - sqlalchemy==1.3.3
+    - urllib3==1.24.2
 prefix: /opt/conda/envs/r2d
 
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.yml b/repo2docker/buildpacks/conda/environment.py-3.7.yml
index 8734c443..5465414c 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,11 +1,11 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2019-03-23 18:02:15 UTC
+# Generated on 2019-04-24 18:01:25 UTC
 dependencies:
 - python=3.7.*
 - ipywidgets==7.4.2
 - jupyterlab==0.35.4
 - nbconvert==5.4.1
-- notebook==5.7.6
+- notebook==5.7.8
 - pip:
-  - nteract_on_jupyter==2.0.0
+  - nteract_on_jupyter==2.0.12
   - jupyterhub==0.9.4
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index 9fde6701..c0abbfd8 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -3,7 +3,7 @@ dependencies:
   - ipywidgets==7.4.2
   - jupyterlab==0.35.4
   - nbconvert==5.4.1
-  - notebook==5.7.6
+  - notebook==5.7.8
   - pip:
-    - nteract_on_jupyter==2.0.0
+    - nteract_on_jupyter==2.0.12
     - jupyterhub==0.9.4