diff --git a/.ci/after_success.sh b/.ci/after_success.sh
index 762670f101c..01889607beb 100755
--- a/.ci/after_success.sh
+++ b/.ci/after_success.sh
@@ -11,9 +11,3 @@ fi
 if [[ $TRAVIS ]]; then
     codecov --flags TravisCI
 fi
-
-if [ "$TRAVIS_PYTHON_VERSION" == "3.9" ]; then
-    # Coverage and quality reports on just the latest diff.
-    depends/diffcover-install.sh
-    depends/diffcover-run.sh
-fi
diff --git a/.ci/install.sh b/.ci/install.sh
index db259bdca12..3e1d64e34e4 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -34,10 +34,9 @@ python3 -m pip install test-image-results
 # TODO Remove condition when numpy supports 3.10
 if ! [ "$GHA_PYTHON_VERSION" == "3.10-dev" ]; then python3 -m pip install numpy ; fi
 
-# TODO Remove when 3.8 / 3.9 / PyPy3 includes setuptools 49.3.2+:
+# TODO Remove when 3.8 / 3.9 includes setuptools 49.3.2+:
 if [ "$GHA_PYTHON_VERSION" == "3.8" ]; then python3 -m pip install -U "setuptools>=49.3.2" ; fi
 if [ "$GHA_PYTHON_VERSION" == "3.9" ]; then python3 -m pip install -U "setuptools>=49.3.2" ; fi
-if [ "$TRAVIS_PYTHON_VERSION" == "pypy3.6-7.3.1" ]; then python3 -m pip install -U "setuptools>=49.3.2" ; fi
 
 # PyQt5 doesn't support PyPy3
 # Wheel doesn't yet support 3.10
@@ -48,9 +47,6 @@ if [[ $GHA_PYTHON_VERSION == 3.* && $GHA_PYTHON_VERSION != "3.10-dev" ]]; then
     python3 -m pip install pyqt5
 fi
 
-# docs only on Python 3.9
-if [ "$TRAVIS_PYTHON_VERSION" == "3.9" ]; then python3 -m pip install -r requirements.txt ; fi
-
 # webp
 pushd depends && ./install_webp.sh && popd
 
diff --git a/.ci/test.sh b/.ci/test.sh
index 1396445e0a4..5a19ec9b42c 100755
--- a/.ci/test.sh
+++ b/.ci/test.sh
@@ -3,8 +3,3 @@
 set -e
 
 python -bb -m pytest -v -x -W always --cov PIL --cov Tests --cov-report term Tests
-
-# Docs
-if [ "$TRAVIS_PYTHON_VERSION" == "3.9" ] && [ "$TRAVIS_CPU_ARCH" == "amd64" ]; then
-    make doccheck
-fi
diff --git a/depends/diffcover-install.sh b/depends/diffcover-install.sh
deleted file mode 100755
index 18be4f9f9d1..00000000000
--- a/depends/diffcover-install.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/env bash
-# Fetch the remote master branch before running diff-cover on Travis CI.
-# https://github.com/Bachmann1234/diff-cover#troubleshooting
-git fetch origin master:refs/remotes/origin/master
-
-# CFLAGS=-O0 means build with no optimisation.
-# Makes build much quicker for lxml and other dependencies.
-time CFLAGS=-O0 python3 -m pip install diff_cover
diff --git a/depends/diffcover-run.sh b/depends/diffcover-run.sh
deleted file mode 100755
index b007494e922..00000000000
--- a/depends/diffcover-run.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-coverage xml
-diff-cover coverage.xml
-diff-quality --violation=pyflakes
-diff-quality --violation=pycodestyle
diff --git a/requirements.txt b/requirements.txt
index 9758f91fd86..ea57e863bad 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,8 +4,6 @@ check-manifest
 coverage
 jarn.viewdoc
 olefile
-pycodestyle
-pyflakes
 pyroma
 pytest
 pytest-cov