diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
index 6be64e3..a15d210 100644
--- a/.github/workflows/mypy.yml
+++ b/.github/workflows/mypy.yml
@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: ['windows-2019', 'macos-latest', 'ubuntu-20.04']
       fail-fast: false
 
     steps:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3a4352e..89e9a43 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -40,6 +40,11 @@ repos:
     - id: ensure-dunder-all
       files: ^github3_utils/.*\.py$
 
+ - repo: https://github.com/domdfcoding/flake2lint
+   rev: v0.1.1
+   hooks:
+    - id: flake2lint
+
  - repo: https://github.com/pre-commit/pygrep-hooks
    rev: v1.7.0
    hooks:
@@ -62,7 +67,7 @@ repos:
     - id: forbid-crlf
 
  - repo: https://github.com/domdfcoding/yapf-isort
-   rev: v0.5.4
+   rev: v0.5.5
    hooks:
     - id: yapf-isort
       exclude: ^(doc-source/conf|__pkginfo__|make_conda_recipe|setup)\.py$
diff --git a/.pylintrc b/.pylintrc
index cfee0f1..12063c9 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -66,7 +66,7 @@ confidence=
 # no Warning level messages displayed, use"--disable=all --enable=classes
 # --disable=W"
 disable=all
-enable=assert-on-tuple,astroid-error,bad-except-order,bad-inline-option,bad-option-value,bad-reversed-sequence,bare-except,binary-op-exception,boolean-datetime,catching-non-exception,cell-var-from-loop,confusing-with-statement,consider-merging-isinstance,consider-using-enumerate,consider-using-ternary,continue-in-finally,cyclic-import,deprecated-pragma,django-not-available,duplicate-except,duplicate-key,eval-used,exec-used,expression-not-assigned,fatal,file-ignored,fixme,global-at-module-level,global-statement,global-variable-not-assigned,global-variable-undefined,http-response-with-content-type-json,http-response-with-json-dumps,invalid-all-object,invalid-characters-in-docstring,len-as-condition,literal-comparison,locally-disabled,locally-enabled,lost-exception,lowercase-l-suffix,misplaced-bare-raise,missing-kwoa,mixed-line-endings,model-has-unicode,model-missing-unicode,model-no-explicit-unicode,model-unicode-not-callable,multiple-imports,multiple-statements,new-db-field-with-default,non-ascii-bytes-literals,nonexistent-operator,not-an-iterable,not-in-loop,notimplemented-raised,overlapping-except,parse-error,pointless-statement,pointless-string-statement,raising-bad-type,raising-non-exception,raw-checker-failed,redefine-in-handler,redefined-argument-from-local,redefined-builtin,redundant-content-type-for-json-response,reimported,relative-import,return-outside-function,simplifiable-if-statement,singleton-comparison,syntax-error,trailing-comma-tuple,trailing-newlines,unbalanced-tuple-unpacking,undefined-all-variable,undefined-loop-variable,unexpected-line-ending-format,unidiomatic-typecheck,unnecessary-lambda,unnecessary-pass,unnecessary-semicolon,unneeded-not,unpacking-non-sequence,unreachable,unrecognized-inline-option,used-before-assignment,useless-else-on-loop,using-constant-test,wildcard-import,yield-outside-function,useless-return
+enable=assert-on-tuple,astroid-error,bad-except-order,bad-inline-option,bad-option-value,bad-reversed-sequence,bare-except,binary-op-exception,boolean-datetime,catching-non-exception,cell-var-from-loop,confusing-with-statement,consider-merging-isinstance,consider-using-enumerate,consider-using-ternary,continue-in-finally,cyclic-import,deprecated-pragma,django-not-available,duplicate-except,duplicate-key,eval-used,exec-used,expression-not-assigned,fatal,file-ignored,fixme,global-at-module-level,global-statement,global-variable-not-assigned,global-variable-undefined,http-response-with-content-type-json,http-response-with-json-dumps,invalid-all-object,invalid-characters-in-docstring,len-as-condition,literal-comparison,locally-disabled,locally-enabled,lost-exception,lowercase-l-suffix,misplaced-bare-raise,missing-kwoa,mixed-line-endings,model-has-unicode,model-missing-unicode,model-no-explicit-unicode,model-unicode-not-callable,multiple-imports,multiple-statements,new-db-field-with-default,non-ascii-bytes-literals,nonexistent-operator,not-in-loop,notimplemented-raised,overlapping-except,parse-error,pointless-statement,pointless-string-statement,raising-bad-type,raising-non-exception,raw-checker-failed,redefine-in-handler,redefined-argument-from-local,redefined-builtin,redundant-content-type-for-json-response,reimported,relative-import,return-outside-function,simplifiable-if-statement,singleton-comparison,syntax-error,trailing-comma-tuple,trailing-newlines,unbalanced-tuple-unpacking,undefined-all-variable,undefined-loop-variable,unexpected-line-ending-format,unidiomatic-typecheck,unnecessary-lambda,unnecessary-pass,unnecessary-semicolon,unneeded-not,unpacking-non-sequence,unreachable,unrecognized-inline-option,used-before-assignment,useless-else-on-loop,using-constant-test,wildcard-import,yield-outside-function,useless-return
 
 [REPORTS]
 
diff --git a/tox.ini b/tox.ini
index 748c79c..419e040 100644
--- a/tox.ini
+++ b/tox.ini
@@ -89,7 +89,6 @@ changedir = {toxinidir}
 extras = all
 deps =
     mypy==0.790
-    lxml
     -r{toxinidir}/tests/requirements.txt
     -r{toxinidir}/stubs.txt
 commands = mypy github3_utils tests {posargs}