diff --git a/.constraints/py3.10.txt b/.constraints/py3.10.txt
index ca81e6c2..b20b76b3 100644
--- a/.constraints/py3.10.txt
+++ b/.constraints/py3.10.txt
@@ -14,7 +14,7 @@ babel==2.9.1
 backcall==0.2.0
 backports.entry-points-selectable==1.1.1
 beautifulsoup4==4.10.0
-black==21.10b0
+black==21.11b0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
@@ -31,7 +31,7 @@ distlib==0.3.3
 docutils==0.16
 entrypoints==0.3
 execnet==1.9.0
-filelock==3.3.2
+filelock==3.4.0
 flake8==4.0.1
 flake8-blind-except==0.2.0
 flake8-bugbear==21.9.2
@@ -47,10 +47,10 @@ fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.24
 gprof2dot==2021.2.21
-graphviz==0.18.1
+graphviz==0.18.2
 greenlet==1.1.2
 hepunits==2.1.2
-identify==2.3.5
+identify==2.3.6
 idna==3.3
 imagesize==1.3.0
 importlib-metadata==4.8.2
@@ -61,7 +61,7 @@ ipython==7.29.0
 ipython-genutils==0.2.0
 ipywidgets==7.6.5
 isort==5.10.1
-jedi==0.18.0
+jedi==0.18.1
 jinja2==3.0.3
 json5==0.9.6
 jsonschema==4.2.1
@@ -97,7 +97,7 @@ nbdime==3.1.1
 nbformat==5.1.3
 nest-asyncio==1.5.1
 nodeenv==1.6.0
-notebook==6.4.5
+notebook==6.4.6
 packaging==21.2
 pandocfilters==1.5.0
 parso==0.8.2
@@ -147,7 +147,7 @@ send2trash==1.8.0
 six==1.16.0
 smmap==5.0.0
 sniffio==1.2.0
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
 soupsieve==2.3.1
 sphinx==4.3.0
 sphinx-autobuild==2021.3.14
diff --git a/.constraints/py3.6.txt b/.constraints/py3.6.txt
index 8b66be75..feef3a0f 100644
--- a/.constraints/py3.6.txt
+++ b/.constraints/py3.6.txt
@@ -15,7 +15,7 @@ babel==2.9.1
 backcall==0.2.0
 backports.entry-points-selectable==1.1.1
 beautifulsoup4==4.10.0
-black==21.10b0
+black==21.11b0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
@@ -33,7 +33,7 @@ distlib==0.3.3
 docutils==0.16
 entrypoints==0.3
 execnet==1.9.0
-filelock==3.3.2
+filelock==3.4.0
 flake8==4.0.1
 flake8-blind-except==0.2.0
 flake8-bugbear==21.9.2
@@ -48,10 +48,10 @@ fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.18
 gprof2dot==2021.2.21
-graphviz==0.18.1
+graphviz==0.18.2
 greenlet==1.1.2
 hepunits==2.1.2
-identify==2.3.5
+identify==2.3.6
 idna==3.3
 imagesize==1.3.0
 immutables==0.16
@@ -63,7 +63,7 @@ ipython==7.16.1
 ipython-genutils==0.2.0
 ipywidgets==7.6.5
 isort==5.10.1
-jedi==0.18.0
+jedi==0.18.1
 jinja2==3.0.3
 json5==0.9.6
 jsonschema==3.2.0
@@ -98,7 +98,7 @@ nbdime==3.1.1
 nbformat==5.1.3
 nest-asyncio==1.5.1
 nodeenv==1.6.0
-notebook==6.4.5
+notebook==6.4.6
 packaging==21.2
 pandocfilters==1.5.0
 parso==0.8.2
@@ -148,7 +148,7 @@ send2trash==1.8.0
 six==1.16.0
 smmap==5.0.0
 sniffio==1.2.0
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
 soupsieve==2.3.1
 sphinx==4.3.0
 sphinx-autobuild==2021.3.14
diff --git a/.constraints/py3.7.txt b/.constraints/py3.7.txt
index be07f7ce..4f9d0159 100644
--- a/.constraints/py3.7.txt
+++ b/.constraints/py3.7.txt
@@ -15,7 +15,7 @@ babel==2.9.1
 backcall==0.2.0
 backports.entry-points-selectable==1.1.1
 beautifulsoup4==4.10.0
-black==21.10b0
+black==21.11b0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
@@ -32,7 +32,7 @@ distlib==0.3.3
 docutils==0.16
 entrypoints==0.3
 execnet==1.9.0
-filelock==3.3.2
+filelock==3.4.0
 flake8==4.0.1
 flake8-blind-except==0.2.0
 flake8-bugbear==21.9.2
@@ -47,10 +47,10 @@ fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.24
 gprof2dot==2021.2.21
-graphviz==0.18.1
+graphviz==0.18.2
 greenlet==1.1.2
 hepunits==2.1.2
-identify==2.3.5
+identify==2.3.6
 idna==3.3
 imagesize==1.3.0
 importlib-metadata==4.2.0
@@ -61,7 +61,7 @@ ipython==7.29.0
 ipython-genutils==0.2.0
 ipywidgets==7.6.5
 isort==5.10.1
-jedi==0.18.0
+jedi==0.18.1
 jinja2==3.0.3
 json5==0.9.6
 jsonschema==4.2.1
@@ -97,7 +97,7 @@ nbdime==3.1.1
 nbformat==5.1.3
 nest-asyncio==1.5.1
 nodeenv==1.6.0
-notebook==6.4.5
+notebook==6.4.6
 packaging==21.2
 pandocfilters==1.5.0
 parso==0.8.2
@@ -147,7 +147,7 @@ send2trash==1.8.0
 six==1.16.0
 smmap==5.0.0
 sniffio==1.2.0
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
 soupsieve==2.3.1
 sphinx==4.3.0
 sphinx-autobuild==2021.3.14
diff --git a/.constraints/py3.8.txt b/.constraints/py3.8.txt
index 5c5d7a3a..0477b023 100644
--- a/.constraints/py3.8.txt
+++ b/.constraints/py3.8.txt
@@ -14,7 +14,7 @@ babel==2.9.1
 backcall==0.2.0
 backports.entry-points-selectable==1.1.1
 beautifulsoup4==4.10.0
-black==21.10b0
+black==21.11b0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
@@ -31,7 +31,7 @@ distlib==0.3.3
 docutils==0.16
 entrypoints==0.3
 execnet==1.9.0
-filelock==3.3.2
+filelock==3.4.0
 flake8==4.0.1
 flake8-blind-except==0.2.0
 flake8-bugbear==21.9.2
@@ -47,10 +47,10 @@ fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.24
 gprof2dot==2021.2.21
-graphviz==0.18.1
+graphviz==0.18.2
 greenlet==1.1.2
 hepunits==2.1.2
-identify==2.3.5
+identify==2.3.6
 idna==3.3
 imagesize==1.3.0
 importlib-metadata==4.8.2
@@ -61,7 +61,7 @@ ipython==7.29.0
 ipython-genutils==0.2.0
 ipywidgets==7.6.5
 isort==5.10.1
-jedi==0.18.0
+jedi==0.18.1
 jinja2==3.0.3
 json5==0.9.6
 jsonschema==4.2.1
@@ -97,7 +97,7 @@ nbdime==3.1.1
 nbformat==5.1.3
 nest-asyncio==1.5.1
 nodeenv==1.6.0
-notebook==6.4.5
+notebook==6.4.6
 packaging==21.2
 pandocfilters==1.5.0
 parso==0.8.2
@@ -147,7 +147,7 @@ send2trash==1.8.0
 six==1.16.0
 smmap==5.0.0
 sniffio==1.2.0
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
 soupsieve==2.3.1
 sphinx==4.3.0
 sphinx-autobuild==2021.3.14
diff --git a/.constraints/py3.9.txt b/.constraints/py3.9.txt
index 6e0f514f..a17a2e44 100644
--- a/.constraints/py3.9.txt
+++ b/.constraints/py3.9.txt
@@ -14,7 +14,7 @@ babel==2.9.1
 backcall==0.2.0
 backports.entry-points-selectable==1.1.1
 beautifulsoup4==4.10.0
-black==21.10b0
+black==21.11b0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
@@ -31,7 +31,7 @@ distlib==0.3.3
 docutils==0.16
 entrypoints==0.3
 execnet==1.9.0
-filelock==3.3.2
+filelock==3.4.0
 flake8==4.0.1
 flake8-blind-except==0.2.0
 flake8-bugbear==21.9.2
@@ -47,10 +47,10 @@ fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.24
 gprof2dot==2021.2.21
-graphviz==0.18.1
+graphviz==0.18.2
 greenlet==1.1.2
 hepunits==2.1.2
-identify==2.3.5
+identify==2.3.6
 idna==3.3
 imagesize==1.3.0
 importlib-metadata==4.8.2
@@ -61,7 +61,7 @@ ipython==7.29.0
 ipython-genutils==0.2.0
 ipywidgets==7.6.5
 isort==5.10.1
-jedi==0.18.0
+jedi==0.18.1
 jinja2==3.0.3
 json5==0.9.6
 jsonschema==4.2.1
@@ -97,7 +97,7 @@ nbdime==3.1.1
 nbformat==5.1.3
 nest-asyncio==1.5.1
 nodeenv==1.6.0
-notebook==6.4.5
+notebook==6.4.6
 packaging==21.2
 pandocfilters==1.5.0
 parso==0.8.2
@@ -147,7 +147,7 @@ send2trash==1.8.0
 six==1.16.0
 smmap==5.0.0
 sniffio==1.2.0
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
 soupsieve==2.3.1
 sphinx==4.3.0
 sphinx-autobuild==2021.3.14
diff --git a/.github/workflows/requirements-cron.yml b/.github/workflows/requirements-cron.yml
index 15c9b1b4..de434c06 100644
--- a/.github/workflows/requirements-cron.yml
+++ b/.github/workflows/requirements-cron.yml
@@ -43,10 +43,15 @@ jobs:
           token: ${{ secrets.PAT }}
         # GITHUB_TOKEN will not rerun checks after pushing to a PR branch
       - uses: actions/download-artifact@v2
-      - run: |
-          [[ -f .pre-commit-config.yaml ]] && mv -f .pre-commit-config.yaml ..
-          mv -f * ../.constraints/
-        working-directory: artifact
+      - run: ls -A
+      - name: Move artifacts to correct location
+        run: |
+          if [[ -d artifact ]]; then
+            cd artifact
+            ls -A
+            [[ -f .pre-commit-config.yaml ]] && mv -f .pre-commit-config.yaml ..
+            [[ "$(ls)" != "" ]] && mv -f * ../.constraints/
+          fi
       - run: git status -s
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v3
diff --git a/.github/workflows/requirements-pr.yml b/.github/workflows/requirements-pr.yml
index c37824f3..41c3154b 100644
--- a/.github/workflows/requirements-pr.yml
+++ b/.github/workflows/requirements-pr.yml
@@ -27,7 +27,7 @@ jobs:
         run: git diff origin/main --exit-code -- .constraints setup.cfg
         continue-on-error: true
       - uses: ComPWA/update-pip-constraints@main
-        if: success()
+        if: failure()
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -42,7 +42,7 @@ jobs:
         run: git diff origin/main --exit-code -- .pre-commit-config.yml
         continue-on-error: true
       - uses: ComPWA/update-pre-commit@main
-        if: success()
+        if: failure()
 
   push:
     name: Push changes
@@ -59,10 +59,14 @@ jobs:
           token: ${{ secrets.PAT }}
         # GITHUB_TOKEN will not rerun checks after pushing to a PR branch
       - uses: actions/download-artifact@v2
-      - run: |
-          [[ -f .pre-commit-config.yaml ]] && mv -f .pre-commit-config.yaml ..
-          mv -f * ../.constraints/
-        working-directory: artifact
+      - name: Move artifacts to correct location
+        run: |
+          if [[ -d artifact ]]; then
+            cd artifact
+            ls -A
+            [[ -f .pre-commit-config.yaml ]] && mv -f .pre-commit-config.yaml ..
+            [[ "$(ls)" != "" ]] && mv -f * ../.constraints/
+          fi
       - run: git status -s
       - name: Commit and push changes
         run: |
diff --git a/.gitpod.yml b/.gitpod.yml
index 6c95089a..bbcb2786 100644
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -15,7 +15,6 @@ vscode:
   extensions:
     - bungcip.better-toml
     - christian-kohler.path-intellisense
-    - codestream.codestream
     - davidanson.vscode-markdownlint
     - eamodio.gitlens
     - editorconfig.editorconfig
diff --git a/.mypy.ini b/.mypy.ini
index dfb2a916..4a48aec2 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -1,11 +1,9 @@
 [mypy]
 disallow_incomplete_defs = True
 disallow_untyped_defs = True
+files = **/*.py
 show_error_codes = True
 warn_unused_configs = True
-files =
-    **/*.py,
-    **/*.pyi,
 
 [mypy-tests.*]
 check_untyped_defs = True
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9ef9063c..a4137cc5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -41,7 +41,7 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/ComPWA/repo-maintenance
-    rev: 0.0.81
+    rev: 0.0.86
     hooks:
       - id: check-dev-files
         args:
@@ -54,7 +54,7 @@ repos:
       - id: format-setup-cfg
 
   - repo: https://github.com/psf/black
-    rev: 21.10b0
+    rev: 21.11b0
     hooks:
       - id: black
 
@@ -141,7 +141,7 @@ repos:
       - id: pyright
 
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.29.0
+    rev: v2.29.1
     hooks:
       - id: pyupgrade
         args:
@@ -163,6 +163,7 @@ repos:
         name: mypy
         entry: mypy
         language: system
+        require_serial: true
         types:
           - python
 
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index f9392bd0..890c2761 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -2,7 +2,6 @@
   "recommendations": [
     "bungcip.better-toml",
     "christian-kohler.path-intellisense",
-    "codestream.codestream",
     "davidanson.vscode-markdownlint",
     "eamodio.gitlens",
     "editorconfig.editorconfig",