diff --git a/CHANGELOG.md b/CHANGELOG.md
index cbcea9100..4171b3109 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,12 +18,15 @@ readthedocs stuff gets all the shiny link goodness. Thanks!
 Unreleased (aka. GitHub master)
 -------------------------------
 
-This is where each new PR to the project should add a summary of its changes,
-which makes it much easier to fill in each release's changelog :)
+0.5.3
+-----
 
 - Replace `template_path` with `extra_template_paths` [#1532](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/pull/1532). Nbconvert 6.0 replaced `template_path` with `extra_template_paths` (see https://nbconvert.readthedocs.io/en/latest/changelog.html#significant-changes). This change in Nbconvert 6.0 causes errors in jupyter_latex_envs and in jupyter_contrib_nbextensions (see [#1529](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/issues/1529).
 - Update `install_requires` list in `setup.py` with 'nbconvert >=6.0' 
 - Drop support for python < 3.6
+- [toc2] fix for disappearing sidebar in static html_toc export [#1548](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/pull/1548)  
+- Fix Extensions Not Loading for Large Notebooks [#1499](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/pull/1499)
+- Support non-live notebook such as nbconvert output [#1535](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/pull/1535)
 
 0.5.1
 -----
diff --git a/appveyor.yml b/appveyor.yml
index d10548c45..07419f0bb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -13,13 +13,6 @@ environment:
     # appropriate libxml headers. As a result, make pip use binary packages.
     PIP_ONLY_BINARY: lxml
   matrix:
-
-    - TOXENV: 'py36-notebook60'
-      TOXPYTHON: C:\Python36\python.exe
-      PYTHON_HOME: C:\Python36
-      PYTHON_VERSION: '3.6'
-      PYTHON_ARCH: '64'
-
     - TOXENV: 'py37-notebook60'
       TOXPYTHON: C:\Python36\python.exe
       PYTHON_HOME: C:\Python37
diff --git a/tox.ini b/tox.ini
index f5438d5dc..c01862349 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,25 +2,25 @@
 # https://testrun.org/tox/latest/config.html#generative-envlist
 
 [tox]
+ignore_basepython_conflict=true
 envlist =
     clean,
     check,
     lint,
-    {py36,py37,py38}-notebook{60,63},
+    {py37,py38}-notebook{60,63},
     report,
 
 [testenv]
 basepython =
     pypy: {env:TOXPYTHON:pypy}
-    py36: {env:TOXPYTHON:python3.6}
     py37: {env:TOXPYTHON:python3.7}
     py38: {env:TOXPYTHON:python3.8}
     {spell}: {env:TOXPYTHON:python3.8}
-    {appveyorartifacts,lint,check}: {env:TOXPYTHON:python3}
+    {appveyorartifacts,lint,check}: {env:TOXPYTHON:python3.8}
     {condarecipe}: {env:TOXPYTHON:python3}
-    {clean,codecov,coveralls,report}: {env:TOXPYTHON:python3}
-    {docs,docs_build,docs_linkcheck}: {env:TOXPYTHON:python3}
-    {bump,pypi_build,pypi_upload}: {env:TOXPYTHON:python3}
+    {clean,codecov,coveralls,report}: {env:TOXPYTHON:python3.8}
+    {docs,docs_build,docs_linkcheck}: {env:TOXPYTHON:python3.8}
+    {bump,pypi_build,pypi_upload}: {env:TOXPYTHON:python3.8}
 setenv =
     PYTHONPATH={toxinidir}/tests
     PYTHONUNBUFFERED=yes