diff --git a/.gitignore b/.gitignore
index 166646d1..f075f26d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,7 +26,6 @@ generated/
 test_file_text.txt
 
 # Untracked artifacts from the conda script
-repo2docker/buildpacks/conda/environment.py-3.5.yml
 repo2docker/buildpacks/conda/environment.py-3.6.yml
 
 \.vscode/
diff --git a/repo2docker/buildpacks/conda/environment.frozen.yml b/repo2docker/buildpacks/conda/environment.frozen.yml
index b6333ff2..06b161f1 100644
--- a/repo2docker/buildpacks/conda/environment.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-3.6.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2018-11-12 20:48:01 UTC
+# Frozen on 2018-11-20 06:19:21 UTC
 name: r2d
 channels:
   - conda-forge
@@ -35,7 +35,7 @@ dependencies:
   - nbconvert=5.4.0=1
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hfc679d8_1
-  - notebook=5.6.0=py36_1
+  - notebook=5.7.2=py36_1000
   - openssl=1.0.2p=h470a237_1
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
@@ -47,29 +47,29 @@ dependencies:
   - prompt_toolkit=2.0.7=py_0
   - ptyprocess=0.6.0=py36_1000
   - pygments=2.2.0=py_1
-  - pyrsistent=0.14.5=py36h470a237_1
+  - pyrsistent=0.14.6=py36h470a237_0
   - python=3.6.6=h5001a0f_3
   - python-dateutil=2.7.5=py_0
   - pyzmq=17.1.2=py36hae99301_1
   - readline=7.0=haf1bffa_1
   - send2trash=1.5.0=py_0
-  - setuptools=40.5.0=py36_0
+  - setuptools=40.6.2=py36_0
   - six=1.11.0=py36_1001
   - sqlite=3.25.3=hb1c47c0_0
   - terminado=0.8.1=py36_1001
   - testpath=0.4.2=py36_1000
-  - tk=8.6.8=ha92aebf_0
-  - tornado=4.5.3=py36_0
+  - tk=8.6.9=ha92aebf_0
+  - tornado=5.1.1=py36h470a237_0
   - traitlets=4.3.2=py36_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
-  - wheel=0.32.2=py36_0
+  - wheel=0.32.3=py36_0
   - widgetsnbextension=3.2.1=py36_1
   - xz=5.2.4=h470a237_1
   - zeromq=4.2.5=hfc679d8_6
   - zlib=1.2.11=h470a237_3
   - pip:
-    - alembic==1.0.2
+    - alembic==1.0.3
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.7
diff --git a/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml
index 73314907..7e016a80 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 2018-11-12 20:35:26 UTC
+# Frozen on 2018-11-20 06:11:34 UTC
 name: r2d
 channels:
   - conda-forge
@@ -13,6 +13,7 @@ dependencies:
   - certifi=2018.10.15=py27_1000
   - decorator=4.3.0=py_0
   - enum34=1.1.6=py27_1001
+  - futures=3.2.0=py27_1000
   - ipykernel=4.8.2=py27_0
   - ipython=5.8.0=py27_0
   - ipython_genutils=0.2.0=py_1
@@ -36,20 +37,17 @@ dependencies:
   - pyzmq=17.1.2=py27hae99301_1
   - readline=7.0=haf1bffa_1
   - scandir=1.9.0=py27h470a237_0
-  - setuptools=40.5.0=py27_0
+  - setuptools=40.6.2=py27_0
   - simplegeneric=0.8.1=py_1
   - singledispatch=3.4.0.3=py27_1000
   - six=1.11.0=py27_1001
   - sqlite=3.25.3=hb1c47c0_0
-  - ssl_match_hostname=3.5.0.1=py27_1001
-  - tk=8.6.8=ha92aebf_0
-  - tornado=4.5.3=py27_0
+  - tk=8.6.9=ha92aebf_0
+  - tornado=5.1.1=py27h470a237_0
   - traitlets=4.3.2=py27_1000
   - wcwidth=0.1.7=py_1
-  - wheel=0.32.2=py27_0
+  - wheel=0.32.3=py27_0
   - zeromq=4.2.5=hfc679d8_6
   - zlib=1.2.11=h470a237_3
-  - pip:
-    - backports.ssl-match-hostname==3.5.0.1
 prefix: /opt/conda/envs/r2d
 
diff --git a/repo2docker/buildpacks/conda/environment.py-2.7.yml b/repo2docker/buildpacks/conda/environment.py-2.7.yml
index e6c5bd26..9e1ecfaa 100644
--- a/repo2docker/buildpacks/conda/environment.py-2.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-2.7.yml
@@ -1,4 +1,3 @@
 dependencies:
 - python=2.7.*
 - ipykernel==4.8.2
-- tornado==4.5.3
diff --git a/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
index 6f774c78..44b53712 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.5.frozen.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.py-3.5.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2018-11-12 20:43:21 UTC
+# Frozen on 2018-11-20 06:16:12 UTC
 name: r2d
 channels:
   - conda-forge
@@ -35,7 +35,7 @@ dependencies:
   - nbconvert=5.4.0=1
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hfc679d8_1
-  - notebook=5.6.0=py35_1
+  - notebook=5.7.0=py35_0
   - openssl=1.0.2p=h470a237_1
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
@@ -58,8 +58,8 @@ dependencies:
   - sqlite=3.25.3=hb1c47c0_0
   - terminado=0.8.1=py35_1
   - testpath=0.3.1=py35_1
-  - tk=8.6.8=ha92aebf_0
-  - tornado=4.5.3=py35_0
+  - tk=8.6.9=ha92aebf_0
+  - tornado=5.1.1=py35h470a237_0
   - traitlets=4.3.2=py35_0
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
@@ -69,7 +69,7 @@ dependencies:
   - zeromq=4.2.5=hfc679d8_6
   - zlib=1.2.11=h470a237_3
   - pip:
-    - alembic==1.0.2
+    - alembic==1.0.3
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.7
diff --git a/repo2docker/buildpacks/conda/environment.py-3.5.yml b/repo2docker/buildpacks/conda/environment.py-3.5.yml
new file mode 100644
index 00000000..9681cea7
--- /dev/null
+++ b/repo2docker/buildpacks/conda/environment.py-3.5.yml
@@ -0,0 +1,11 @@
+dependencies:
+- python=3.5.*
+- ipywidgets==7.2.1
+- jupyterlab==0.34.9
+- nbconvert==5.4.0
+- pip:
+  # conda-forge dropped python 3.5 support so we use the pip package
+  # for notebook
+  - notebook==5.7.2
+  - nteract_on_jupyter==1.9.6
+  - jupyterhub==0.9.4
diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml
index b6333ff2..06b161f1 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 2018-11-12 20:48:01 UTC
+# Frozen on 2018-11-20 06:19:21 UTC
 name: r2d
 channels:
   - conda-forge
@@ -35,7 +35,7 @@ dependencies:
   - nbconvert=5.4.0=1
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hfc679d8_1
-  - notebook=5.6.0=py36_1
+  - notebook=5.7.2=py36_1000
   - openssl=1.0.2p=h470a237_1
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
@@ -47,29 +47,29 @@ dependencies:
   - prompt_toolkit=2.0.7=py_0
   - ptyprocess=0.6.0=py36_1000
   - pygments=2.2.0=py_1
-  - pyrsistent=0.14.5=py36h470a237_1
+  - pyrsistent=0.14.6=py36h470a237_0
   - python=3.6.6=h5001a0f_3
   - python-dateutil=2.7.5=py_0
   - pyzmq=17.1.2=py36hae99301_1
   - readline=7.0=haf1bffa_1
   - send2trash=1.5.0=py_0
-  - setuptools=40.5.0=py36_0
+  - setuptools=40.6.2=py36_0
   - six=1.11.0=py36_1001
   - sqlite=3.25.3=hb1c47c0_0
   - terminado=0.8.1=py36_1001
   - testpath=0.4.2=py36_1000
-  - tk=8.6.8=ha92aebf_0
-  - tornado=4.5.3=py36_0
+  - tk=8.6.9=ha92aebf_0
+  - tornado=5.1.1=py36h470a237_0
   - traitlets=4.3.2=py36_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
-  - wheel=0.32.2=py36_0
+  - wheel=0.32.3=py36_0
   - widgetsnbextension=3.2.1=py36_1
   - xz=5.2.4=h470a237_1
   - zeromq=4.2.5=hfc679d8_6
   - zlib=1.2.11=h470a237_3
   - pip:
-    - alembic==1.0.2
+    - alembic==1.0.3
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.7
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml
index 00d996c7..0365b7ad 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 2018-11-12 20:38:27 UTC
+# Frozen on 2018-11-20 06:13:10 UTC
 name: r2d
 channels:
   - conda-forge
@@ -34,7 +34,7 @@ dependencies:
   - nbconvert=5.4.0=1
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hfc679d8_1
-  - notebook=5.6.0=py37_1
+  - notebook=5.7.2=py37_1000
   - openssl=1.0.2p=h470a237_1
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
@@ -46,31 +46,31 @@ dependencies:
   - prompt_toolkit=2.0.7=py_0
   - ptyprocess=0.6.0=py37_1000
   - pygments=2.2.0=py_1
-  - pyrsistent=0.14.5=py37h470a237_1
-  - python=3.7.0=h5001a0f_6
+  - pyrsistent=0.14.6=py37h470a237_0
+  - python=3.7.1=h5001a0f_0
   - python-dateutil=2.7.5=py_0
   - pyzmq=17.1.2=py37hae99301_1
   - readline=7.0=haf1bffa_1
   - send2trash=1.5.0=py_0
-  - setuptools=40.5.0=py37_0
+  - setuptools=40.6.2=py37_0
   - six=1.11.0=py37_1001
   - sqlite=3.25.3=hb1c47c0_0
   - terminado=0.8.1=py37_1001
   - testpath=0.4.2=py37_1000
-  - tk=8.6.8=ha92aebf_0
+  - tk=8.6.9=ha92aebf_0
+  - tornado=5.1.1=py37h470a237_0
   - traitlets=4.3.2=py37_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
-  - wheel=0.32.2=py37_0
+  - wheel=0.32.3=py37_0
   - widgetsnbextension=3.4.2=py37_1000
   - xz=5.2.4=h470a237_1
   - zeromq=4.2.5=hfc679d8_6
   - zlib=1.2.11=h470a237_3
   - ipywidgets=7.2.1=py37_0
   - jupyterlab=0.34.9=py37_0
-  - tornado=4.5.3=py37_0
   - pip:
-    - alembic==1.0.2
+    - alembic==1.0.3
     - async-generator==1.10
     - chardet==3.0.4
     - idna==2.7
@@ -84,3 +84,4 @@ dependencies:
     - sqlalchemy==1.2.14
     - urllib3==1.24.1
 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 f9245add..a957401c 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,12 +1,11 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2018-11-12 20:38:27 UTC
+# Generated on 2018-11-20 06:13:10 UTC
 dependencies:
 - python=3.7.*
 - ipywidgets==7.2.1
 - jupyterlab==0.34.9
 - nbconvert==5.4.0
-- tornado==4.5.3
-- notebook==5.6.0
+- notebook==5.7.2
 - pip:
   - nteract_on_jupyter==1.9.6
   - jupyterhub==0.9.4
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index 71ee2a44..9af58159 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -3,8 +3,7 @@ dependencies:
   - ipywidgets==7.2.1
   - jupyterlab==0.34.9
   - nbconvert==5.4.0
-  - tornado==4.5.3
-  - notebook==5.6.0
+  - notebook==5.7.2
   - pip:
     - nteract_on_jupyter==1.9.6
     - jupyterhub==0.9.4