diff --git a/.travis.yml b/.travis.yml
index 7cdefce4..c39755b1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -22,7 +22,6 @@ env:
     - SCRIPT="test"
     - TEST_ARGS=""
     - BRANCH_NAME="${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}"
-    - PIP_USE_FEATURE="2020-resolver"
     - TF_VERSION="tensorflow"
 
 jobs:
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 61536332..a0145cd2 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -26,10 +26,6 @@ If you want to fix a bug or add a feature to KerasLMU,
 we welcome pull requests.
 Ensure that you fill out all sections of the pull request template,
 deleting the comments as you go.
-We check most aspects of code style automatically.
-Please refer to our
-`code style guide <https://www.nengo.ai/nengo-bones/style.html>`_
-for things that we check manually.
 
 Contributor agreement
 =====================
diff --git a/setup.cfg b/setup.cfg
index dd7fb202..a9395c39 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -111,4 +111,4 @@ reports = no
 score = no
 
 [codespell]
-skip = ./build,*/_build,*-checkpoint.ipynb,./.eggs,./.git,*/_vendor,
+skip = ./build,*/_build,*-checkpoint.ipynb,./.eggs,./*.egg-info,./.git,*/_vendor,./.mypy_cache,