diff --git a/.gitpod.yml b/.gitpod.yml
index 97ac67a3..7add259a 100644
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -1,6 +1,6 @@
 tasks:
-  - init: pyenv local 3.8
-  - init: pip install -c .constraints/py3.8.txt -e .[dev]
+  - init: pyenv local 3.9
+  - init: pip install -c .constraints/py3.9.txt -e .[dev]
 
 github:
   prebuilds:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 98fa526d..803535c6 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,7 +13,7 @@ repos:
       - id: check-useless-excludes
 
   - repo: https://github.com/ComPWA/policy
-    rev: 0.2.0
+    rev: 0.2.2
     hooks:
       - id: check-dev-files
         args:
diff --git a/docs/conf.py b/docs/conf.py
index 51f2c629..d77150b7 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -112,7 +112,7 @@
     "icon_links": [
         {
             "name": "Common Partial Wave Analysis",
-            "url": "https://compwa-org.rtfd.io",
+            "url": "https://compwa.github.io",
             "icon": "_static/favicon.ico",
             "type": "local",
         },
@@ -162,7 +162,7 @@
     "IPython": (f"https://ipython.readthedocs.io/en/{pin('IPython')}", None),
     "ampform": (f"https://ampform.readthedocs.io/en/{pin('ampform')}", None),
     "attrs": (f"https://www.attrs.org/en/{pin('attrs')}", None),
-    "compwa-org": ("https://compwa-org.readthedocs.io", None),
+    "compwa": ("https://compwa.github.io", None),
     "graphviz": ("https://graphviz.readthedocs.io/en/stable", None),
     "ipywidgets": (f"https://ipywidgets.readthedocs.io/en/{pin('ipywidgets')}", None),
     "jax": ("https://jax.readthedocs.io/en/latest", None),
diff --git a/docs/index.md b/docs/index.md
index 911eb619..8b1fb26c 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -31,7 +31,7 @@ You can substitute `stable` in the above command with `main` or any of the [tags
 ampform-dpd @ git+https://github.com/ComPWA/ampform-dpd@main
 ```
 
-However, we highly recommend using the more dynamic, {ref}`'editable installation' <compwa-org:develop:Editable installation>` instead. This goes as follows:
+However, we highly recommend using the more dynamic, {ref}`'editable installation' <compwa:develop:Editable installation>` instead. This goes as follows:
 
 1. Get the source code (see [the Pro Git Book](https://git-scm.com/book/en/v2)):
 
@@ -40,15 +40,15 @@ However, we highly recommend using the more dynamic, {ref}`'editable installatio
    cd ampform-dpd
    ```
 
-2. **\[Recommended\]** Create a virtual environment (see {ref}`here <compwa-org:develop:Virtual environment>` or the tip below).
+2. **\[Recommended\]** Create a virtual environment (see {ref}`here <compwa:develop:Virtual environment>` or the tip below).
 
-3. Install the project in {ref}`'editable installation' <compwa-org:develop:Editable installation>` with {ref}`additional dependencies <compwa-org:develop:Optional dependencies>` for the developer:
+3. Install the project in {ref}`'editable installation' <compwa:develop:Editable installation>` with {ref}`additional dependencies <compwa:develop:Optional dependencies>` for the developer:
 
    ```shell
    python3 -m pip install -e .[dev]
    ```
 
-That's all! Have a look at the {doc}`/index` page to try out the package, and see {doc}`compwa-org:develop` for tips on how to work with this 'editable' developer setup!
+That's all! Have a look at the {doc}`/index` page to try out the package, and see {doc}`compwa:develop` for tips on how to work with this 'editable' developer setup!
 
 :::{tip}
 
@@ -59,7 +59,7 @@ conda env create
 conda activate ampform-dpd
 ```
 
-This way of installing is also safer, because it {ref}`pins all dependencies <compwa-org:develop:Pinning dependency versions>`. Note you can also pin dependencies with `pip`, by running:
+This way of installing is also safer, because it {ref}`pins all dependencies <compwa:develop:Pinning dependency versions>`. Note you can also pin dependencies with `pip`, by running:
 
 ```shell
 python3 -m pip install -e .[dev] -c .constraints/py3.x.txt
@@ -196,5 +196,5 @@ QRules <https://qrules.readthedocs.io>
 AmpForm <https://ampform.readthedocs.io>
 TensorWaves <https://tensorwaves.readthedocs.io>
 PWA Pages <https://pwa.readthedocs.io>
-ComPWA project <https://compwa-org.readthedocs.io>
+ComPWA project <https://compwa.github.io>
 ```
diff --git a/environment.yml b/environment.yml
index 17c7d794..ec90afd9 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,10 +3,10 @@ channels:
   - defaults
 dependencies:
   - graphviz
-  - python==3.8.*
+  - python==3.9.*
   - pip
   - pip:
-      - -c .constraints/py3.8.txt -e .[dev]
+      - -c .constraints/py3.9.txt -e .[dev]
 variables:
   PRETTIER_LEGACY_CLI: "1"
   PYTHONHASHSEED: 0