diff --git a/.coveralls.yml b/.coveralls.yml
deleted file mode 100644
index fe166c1..0000000
--- a/.coveralls.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-coverage_clover: docs/phpunit/clover.xml
-json_path: docs/phpunit/coveralls-upload.json
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
deleted file mode 100644
index 2dfab90..0000000
--- a/.github/workflows/phpstan.yml
+++ /dev/null
@@ -1,42 +0,0 @@
-name: PHPStan
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-
-jobs:
-  analyse:
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-
-    - name: Set up PHP 7.4
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: '7.4'
-        extensions: mbstring
-        tools: cs2pr, phpstan:0.12.9
-
-    - name: Validate composer.json and composer.lock
-      run: composer validate
-
-    - name: Get Composer Cache Directory
-      id: composer-cache
-      run: echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-    - name: Cache dependencies
-      uses: actions/cache@v1
-      with:
-        path: ${{ steps.composer-cache.outputs.dir }}
-        key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
-        restore-keys: ${{ runner.os }}-composer-
-
-    - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest
-
-    - name: PHPStan
-      run: phpstan analyse --error-format=checkstyle | cs2pr
diff --git a/.github/workflows/runTests.yml b/.github/workflows/runTests.yml
index b9f1190..06a94e4 100644
--- a/.github/workflows/runTests.yml
+++ b/.github/workflows/runTests.yml
@@ -59,10 +59,3 @@ jobs:
     - name: Run test suite
       run: composer run-script test -- --coverage-text
 
-    - name: Notify Coveralls
-      if: matrix.php-versions == '7.3' && runner.os == 'Linux' && matrix.dependencies == 'install'
-      env:
-        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
-      run: |
-        composer require php-coveralls/php-coveralls
-        composer run-script php-coveralls -- --verbose
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
deleted file mode 100644
index 9ae9bcf..0000000
--- a/phpstan.neon.dist
+++ /dev/null
@@ -1,31 +0,0 @@
-includes:
-  - vendor/bovigo/assert/src/main/resources/phpstan/bovigo-assert.neon
-parameters:
-  inferPrivatePropertyTypeFromConstructor: true
-  level: max
-  paths:
-      - ./src/main/php
-      - ./src/test/php
-  ignoreErrors:
-      # False positive
-      - '#Call to an undefined method stubbles\\reflect\\annotation\\Annotation::#'
-      -
-          message: '#doc of method XSLTProcessor::transformToDoc() expects DOMNode, DOMDocument|null given#'
-          path: src/main/php/xsl/XslProcessor.php
-      # phpstan doesn't know return values of \XSLTProcessor properly
-      -
-          message: '#Strict comparison using === between false and DOMDocument will always evaluate to false#'
-          path: src/main/php/xsl/XslProcessor.php
-      -
-          message: '#Strict comparison using === between false and int will always evaluate to false#'
-          path: src/main/php/xsl/XslProcessor.php
-      -
-          message: '#Strict comparison using === between false and string will always evaluate to false#'
-          path: src/main/php/xsl/XslProcessor.php
-      # explicit tests
-      -
-          message: '#rssFeedItem of method stubbles\\xml\\rss\\RssFeedItemSerializer::serialize\(\) expects stubbles\\xml\\rss\\RssFeedItem, stdClass given#'
-          path: src/test/php/rss/RssFeedItemSerializerTest.php
-      -
-          message: '#rssFeed of method stubbles\\xml\\rss\\RssFeedSerializer::serialize\(\) expects stubbles\\xml\\rss\\RssFeed, stdClass given#'
-          path: src/test/php/rss/RssFeedSerializerTest.php