diff --git a/repo2docker/buildpacks/conda/__init__.py b/repo2docker/buildpacks/conda/__init__.py
index 38ac92ff..69a28be5 100644
--- a/repo2docker/buildpacks/conda/__init__.py
+++ b/repo2docker/buildpacks/conda/__init__.py
@@ -77,7 +77,7 @@ class CondaBuildPack(BaseImage):
 
     major_pythons = {
         '2': '2.7',
-        '3': '3.6',
+        '3': '3.7',
     }
 
     def get_build_script_files(self):
diff --git a/repo2docker/buildpacks/conda/environment.frozen.yml b/repo2docker/buildpacks/conda/environment.frozen.yml
index 506424f3..df1d8306 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 2019-01-30 18:42:13 UTC
+# AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
+# Frozen on 2019-02-11 20:26:36 UTC
 name: r2d
 channels:
   - conda-forge
@@ -9,65 +9,66 @@ dependencies:
   - attrs=18.2.0=py_0
   - backcall=0.1.0=py_0
   - bleach=3.1.0=py_0
+  - bzip2=1.0.6=h14c3975_1002
   - ca-certificates=2018.11.29=ha4d7672_0
-  - certifi=2018.11.29=py36_1000
+  - certifi=2018.11.29=py37_1000
   - decorator=4.3.2=py_0
   - defusedxml=0.5.0=py_1
-  - entrypoints=0.3=py36_1000
+  - entrypoints=0.3=py37_1000
   - gmp=6.1.2=hf484d3e_1000
-  - ipykernel=5.1.0=py36h24bf2e0_1002
-  - ipython=7.2.0=py36h24bf2e0_1000
+  - ipykernel=5.1.0=py37h24bf2e0_1002
+  - ipython=7.2.0=py37h24bf2e0_1000
   - ipython_genutils=0.2.0=py_1
-  - ipywidgets=7.2.1=py36_1
-  - jedi=0.13.2=py36_1000
+  - jedi=0.13.2=py37_1000
   - jinja2=2.10=py_1
-  - jsonschema=3.0.0a3=py36_1000
+  - jsonschema=3.0.0a3=py37_1000
   - jupyter_client=5.2.4=py_1
   - jupyter_core=4.4.0=py_0
-  - jupyterlab=0.34.9=py36_0
   - jupyterlab_launcher=0.13.1=py_2
   - libffi=3.2.1=hf484d3e_1005
   - libgcc-ng=7.3.0=hdf63c60_0
   - libsodium=1.0.16=h14c3975_1001
   - libstdcxx-ng=7.3.0=hdf63c60_0
-  - markupsafe=1.1.0=py36h14c3975_1000
-  - mistune=0.8.4=py36h14c3975_1000
+  - markupsafe=1.1.0=py37h14c3975_1000
+  - mistune=0.8.4=py37h14c3975_1000
   - nbconvert=5.4.0=1
   - nbformat=4.4.0=py_1
   - ncurses=6.1=hf484d3e_1002
-  - notebook=5.7.4=py36_1000
+  - notebook=5.7.4=py37_1000
   - openssl=1.0.2p=h14c3975_1002
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.2=py_0
-  - pexpect=4.6.0=py36_1000
-  - pickleshare=0.7.5=py36_1000
-  - pip=19.0.1=py36_0
+  - parso=0.3.3=py_0
+  - pexpect=4.6.0=py37_1000
+  - pickleshare=0.7.5=py37_1000
+  - pip=19.0.2=py37_0
   - prometheus_client=0.5.0=py_0
   - prompt_toolkit=2.0.8=py_0
-  - ptyprocess=0.6.0=py36_1000
+  - ptyprocess=0.6.0=py37_1000
   - pygments=2.3.1=py_0
-  - pyrsistent=0.14.9=py36h14c3975_1000
-  - python=3.6.7=hd21baee_1001
-  - python-dateutil=2.7.5=py_0
-  - pyzmq=17.1.2=py36h6afc9c9_1001
+  - pyrsistent=0.14.10=py37h14c3975_0
+  - python=3.7.1=hd21baee_1000
+  - python-dateutil=2.8.0=py_0
+  - pyzmq=17.1.2=py37h6afc9c9_1001
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.7.1=py36_0
-  - six=1.12.0=py36_1000
+  - setuptools=40.8.0=py37_0
+  - six=1.12.0=py37_1000
   - sqlite=3.26.0=h67949de_1000
-  - terminado=0.8.1=py36_1001
-  - testpath=0.4.2=py36_1000
+  - terminado=0.8.1=py37_1001
+  - testpath=0.4.2=py37_1000
   - tk=8.6.9=h84994c4_1000
-  - tornado=5.1.1=py36h14c3975_1000
-  - traitlets=4.3.2=py36_1000
+  - tornado=5.1.1=py37h14c3975_1000
+  - traitlets=4.3.2=py37_1000
   - wcwidth=0.1.7=py_1
   - webencodings=0.5.1=py_1
-  - wheel=0.32.3=py36_0
-  - widgetsnbextension=3.2.1=py36_1
+  - wheel=0.32.3=py37_0
+  - widgetsnbextension=3.4.2=py37_1000
   - xz=5.2.4=h14c3975_1001
   - zeromq=4.2.5=hf484d3e_1006
   - zlib=1.2.11=h14c3975_1004
+  - ipywidgets=7.2.1=py37_0
+  - jupyterlab=0.34.9=py37_0
   - pip:
     - alembic==1.0.7
     - async-generator==1.10
@@ -77,7 +78,7 @@ dependencies:
     - mako==1.0.7
     - nteract-on-jupyter==2.0.0
     - pamela==1.0.0
-    - python-editor==1.0.3
+    - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
     - sqlalchemy==1.2.17
diff --git a/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-2.7.frozen.yml
index e10f7380..ffc95300 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 2019-01-30 18:36:55 UTC
+# Frozen on 2019-02-11 20:20:33 UTC
 name: r2d
 channels:
   - conda-forge
@@ -28,16 +28,16 @@ dependencies:
   - pathlib2=2.3.3=py27_1000
   - pexpect=4.6.0=py27_1000
   - pickleshare=0.7.5=py27_1000
-  - pip=19.0.1=py27_0
+  - pip=19.0.2=py27_0
   - prompt_toolkit=1.0.15=py_1
   - ptyprocess=0.6.0=py27_1000
   - pygments=2.3.1=py_0
   - python=2.7.15=h938d71a_1006
-  - python-dateutil=2.7.5=py_0
+  - python-dateutil=2.8.0=py_0
   - pyzmq=17.1.2=py27h6afc9c9_1001
   - readline=7.0=hf8c457e_1001
   - scandir=1.9.0=py27h14c3975_1000
-  - setuptools=40.7.1=py27_0
+  - setuptools=40.8.0=py27_0
   - simplegeneric=0.8.1=py_1
   - singledispatch=3.4.0.3=py27_1000
   - six=1.12.0=py27_1000
diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.6.frozen.yml
index 506424f3..65f724c8 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 2019-01-30 18:42:13 UTC
+# Frozen on 2019-02-11 20:22:50 UTC
 name: r2d
 channels:
   - conda-forge
@@ -39,21 +39,21 @@ dependencies:
   - openssl=1.0.2p=h14c3975_1002
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.2=py_0
+  - parso=0.3.3=py_0
   - pexpect=4.6.0=py36_1000
   - pickleshare=0.7.5=py36_1000
-  - pip=19.0.1=py36_0
+  - pip=19.0.2=py36_0
   - prometheus_client=0.5.0=py_0
   - prompt_toolkit=2.0.8=py_0
   - ptyprocess=0.6.0=py36_1000
   - pygments=2.3.1=py_0
-  - pyrsistent=0.14.9=py36h14c3975_1000
+  - pyrsistent=0.14.10=py36h14c3975_0
   - python=3.6.7=hd21baee_1001
-  - python-dateutil=2.7.5=py_0
+  - python-dateutil=2.8.0=py_0
   - pyzmq=17.1.2=py36h6afc9c9_1001
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.7.1=py36_0
+  - setuptools=40.8.0=py36_0
   - six=1.12.0=py36_1000
   - sqlite=3.26.0=h67949de_1000
   - terminado=0.8.1=py36_1001
@@ -77,7 +77,7 @@ dependencies:
     - mako==1.0.7
     - nteract-on-jupyter==2.0.0
     - pamela==1.0.0
-    - python-editor==1.0.3
+    - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
     - sqlalchemy==1.2.17
diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.yml b/repo2docker/buildpacks/conda/environment.py-3.6.yml
index bf38bad9..e7e92399 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.6.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.6.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2019-01-30 18:42:13 UTC
+# Generated on 2019-02-11 20:22:50 UTC
 dependencies:
 - python=3.6.*
 - ipywidgets==7.2.1
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml b/repo2docker/buildpacks/conda/environment.py-3.7.frozen.yml
index db73da67..df1d8306 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 2019-01-30 18:38:58 UTC
+# Frozen on 2019-02-11 20:26:36 UTC
 name: r2d
 channels:
   - conda-forge
@@ -38,21 +38,21 @@ dependencies:
   - openssl=1.0.2p=h14c3975_1002
   - pandoc=1.19.2=0
   - pandocfilters=1.4.2=py_1
-  - parso=0.3.2=py_0
+  - parso=0.3.3=py_0
   - pexpect=4.6.0=py37_1000
   - pickleshare=0.7.5=py37_1000
-  - pip=19.0.1=py37_0
+  - pip=19.0.2=py37_0
   - prometheus_client=0.5.0=py_0
   - prompt_toolkit=2.0.8=py_0
   - ptyprocess=0.6.0=py37_1000
   - pygments=2.3.1=py_0
-  - pyrsistent=0.14.9=py37h14c3975_1000
+  - pyrsistent=0.14.10=py37h14c3975_0
   - python=3.7.1=hd21baee_1000
-  - python-dateutil=2.7.5=py_0
+  - python-dateutil=2.8.0=py_0
   - pyzmq=17.1.2=py37h6afc9c9_1001
   - readline=7.0=hf8c457e_1001
   - send2trash=1.5.0=py_0
-  - setuptools=40.7.1=py37_0
+  - setuptools=40.8.0=py37_0
   - six=1.12.0=py37_1000
   - sqlite=3.26.0=h67949de_1000
   - terminado=0.8.1=py37_1001
@@ -78,7 +78,7 @@ dependencies:
     - mako==1.0.7
     - nteract-on-jupyter==2.0.0
     - pamela==1.0.0
-    - python-editor==1.0.3
+    - python-editor==1.0.4
     - python-oauth2==1.1.0
     - requests==2.21.0
     - sqlalchemy==1.2.17
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.yml b/repo2docker/buildpacks/conda/environment.py-3.7.yml
index 522453a4..ef664280 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,5 +1,5 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2019-01-30 18:38:58 UTC
+# Generated on 2019-02-11 20:26:36 UTC
 dependencies:
 - python=3.7.*
 - ipywidgets==7.2.1
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index e58aa0f5..88ecadc1 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -1,5 +1,5 @@
 dependencies:
-  - python=3.6.*
+  - python=3.7.*
   - ipywidgets==7.2.1
   - jupyterlab==0.34.9
   - nbconvert==5.4.0
diff --git a/repo2docker/buildpacks/conda/freeze.py b/repo2docker/buildpacks/conda/freeze.py
index 2a0254d3..904ff4fb 100755
--- a/repo2docker/buildpacks/conda/freeze.py
+++ b/repo2docker/buildpacks/conda/freeze.py
@@ -107,7 +107,7 @@ def set_python(py_env_file, py):
 
 if __name__ == '__main__':
     # allow specifying which Pythons to update on argv
-    pys = sys.argv[1:] or ('2.7', '3.7', '3.5', '3.6')
+    pys = sys.argv[1:] or ('2.7', '3.5', '3.6', '3.7')
     for py in pys:
         env_file = ENV_FILE_T.format(py=py)
         set_python(env_file, py)
diff --git a/tests/conda/requirements/verify b/tests/conda/requirements/verify
index 09dcf196..cc4152b7 100755
--- a/tests/conda/requirements/verify
+++ b/tests/conda/requirements/verify
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 6), sys.version
+assert sys.version_info[:2] == (3, 7), sys.version
 
 import numpy
 try:
diff --git a/tests/conda/simple-py2/verify b/tests/conda/simple-py2/verify
index 57f75c5e..a6adf3c3 100755
--- a/tests/conda/simple-py2/verify
+++ b/tests/conda/simple-py2/verify
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 6), sys.version
+assert sys.version_info[:2] == (3, 7), sys.version
 
 # verify that we have Python 2 and Python 3 kernelspecs
 from jupyter_client.kernelspec import KernelSpecManager
diff --git a/tests/conda/simple/verify b/tests/conda/simple/verify
index 2269714c..54d39472 100755
--- a/tests/conda/simple/verify
+++ b/tests/conda/simple/verify
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 6), sys.version
+assert sys.version_info[:2] == (3, 7), sys.version
 
 import numpy
diff --git a/tests/venv/default/verify b/tests/venv/default/verify
index 3be5a216..0d65593d 100755
--- a/tests/venv/default/verify
+++ b/tests/venv/default/verify
@@ -2,7 +2,7 @@
 # Verify that the default just provides a py3 environment with jupyter
 import sys
 
-assert sys.version_info[:2] == (3, 6), sys.version
+assert sys.version_info[:2] == (3, 7), sys.version
 import jupyter
 
 with open('/tmp/appendix') as f:
diff --git a/tests/venv/numpy/verify b/tests/venv/numpy/verify
index 4ad54bfd..34769ecb 100755
--- a/tests/venv/numpy/verify
+++ b/tests/venv/numpy/verify
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import sys
 
-assert sys.version_info[:2] == (3, 6)
+assert sys.version_info[:2] == (3, 7)
 
 import numpy