diff --git a/.constraints/py3.10.txt b/.constraints/py3.10.txt
index 51b286d0..1d6ce413 100644
--- a/.constraints/py3.10.txt
+++ b/.constraints/py3.10.txt
@@ -15,12 +15,12 @@ attrs==21.4.0
 babel==2.9.1
 backcall==0.2.0
 beautifulsoup4==4.10.0
-black==21.12b0
+black==22.1.0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
 cfgv==3.3.1
-charset-normalizer==2.0.10
+charset-normalizer==2.0.11
 click==8.0.3
 colorama==0.4.4
 coverage==6.3
@@ -45,7 +45,6 @@ flake8-pytest-style==1.6.0
 flake8-rst-docstrings==0.2.5
 flake8-type-ignore==0.1.0.post2 ; python_version >= "3.8.0"
 flake8-use-fstring==1.3
-fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.26
 gprof2dot==2021.2.21
@@ -76,6 +75,8 @@ jupyter-server-mathjax==0.2.3
 jupyter-sphinx==0.3.2
 jupyterlab==3.2.8
 jupyterlab-code-formatter==1.4.10
+jupyterlab-markup==1.0.1
+jupyterlab-myst==0.1.6 ; python_version >= "3.7.0"
 jupyterlab-pygments==0.1.2
 jupyterlab-server==2.10.3
 jupyterlab-widgets==1.0.2
@@ -155,6 +156,7 @@ soupsieve==2.3.1
 sphinx==4.4.0
 sphinx-autobuild==2021.3.14
 sphinx-book-theme==0.2.0
+sphinx-codeautolink==0.10.0
 sphinx-copybutton==0.4.0
 sphinx-panels==0.6.0
 sphinx-thebe==0.0.10
@@ -167,13 +169,13 @@ sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-sphobjinv==2.1
+sphobjinv==2.2
 sqlalchemy==1.4.31
 stack-data==0.1.4
 terminado==0.13.1
 testpath==0.5.0
 toml==0.10.2
-tomli==1.2.3
+tomli==2.0.0
 tornado==6.1
 tox==3.24.5
 tqdm==4.62.3
@@ -182,7 +184,7 @@ types-docutils==0.17.4
 types-pkg-resources==0.1.3
 types-pyyaml==6.0.3
 types-requests==2.27.7
-types-setuptools==57.4.7
+types-setuptools==57.4.8
 types-urllib3==1.26.7
 typing-extensions==4.0.1
 urllib3==1.26.8
diff --git a/.constraints/py3.6.txt b/.constraints/py3.6.txt
index cf85939b..1699cf42 100644
--- a/.constraints/py3.6.txt
+++ b/.constraints/py3.6.txt
@@ -15,12 +15,12 @@ attrs==21.4.0
 babel==2.9.1
 backcall==0.2.0
 beautifulsoup4==4.10.0
-black==21.12b0
+black==22.1.0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
 cfgv==3.3.1
-charset-normalizer==2.0.10
+charset-normalizer==2.0.11
 click==8.0.3
 colorama==0.4.4
 contextvars==2.4
@@ -44,7 +44,6 @@ flake8-polyfill==1.0.2
 flake8-pytest-style==1.6.0
 flake8-rst-docstrings==0.2.5
 flake8-use-fstring==1.3
-fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.18
 gprof2dot==2021.2.21
@@ -154,6 +153,7 @@ soupsieve==2.3.1
 sphinx==4.3.2 ; python_version < "3.8.0"
 sphinx-autobuild==2021.3.14
 sphinx-book-theme==0.2.0
+sphinx-codeautolink==0.10.0
 sphinx-copybutton==0.4.0
 sphinx-panels==0.6.0
 sphinx-thebe==0.0.10
@@ -166,7 +166,7 @@ sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-sphobjinv==2.1
+sphobjinv==2.2
 sqlalchemy==1.4.31
 terminado==0.12.1
 testpath==0.5.0
@@ -181,7 +181,7 @@ types-docutils==0.17.4
 types-pkg-resources==0.1.3
 types-pyyaml==6.0.3
 types-requests==2.27.7
-types-setuptools==57.4.7
+types-setuptools==57.4.8
 types-urllib3==1.26.7
 typing-extensions==4.0.1 ; python_version < "3.8.0"
 urllib3==1.26.8
diff --git a/.constraints/py3.7.txt b/.constraints/py3.7.txt
index 68361c62..ca705e2b 100644
--- a/.constraints/py3.7.txt
+++ b/.constraints/py3.7.txt
@@ -14,12 +14,12 @@ attrs==21.4.0
 babel==2.9.1
 backcall==0.2.0
 beautifulsoup4==4.10.0
-black==21.12b0
+black==22.1.0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
 cfgv==3.3.1
-charset-normalizer==2.0.10
+charset-normalizer==2.0.11
 click==8.0.3
 colorama==0.4.4
 coverage==6.3
@@ -42,7 +42,6 @@ flake8-polyfill==1.0.2
 flake8-pytest-style==1.6.0
 flake8-rst-docstrings==0.2.5
 flake8-use-fstring==1.3
-fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.26
 gprof2dot==2021.2.21
@@ -74,6 +73,8 @@ jupyter-server-mathjax==0.2.3
 jupyter-sphinx==0.3.2
 jupyterlab==3.2.8
 jupyterlab-code-formatter==1.4.10
+jupyterlab-markup==1.0.1
+jupyterlab-myst==0.1.6 ; python_version >= "3.7.0"
 jupyterlab-pygments==0.1.2
 jupyterlab-server==2.10.3
 jupyterlab-widgets==1.0.2
@@ -152,6 +153,7 @@ soupsieve==2.3.1
 sphinx==4.3.2 ; python_version < "3.8.0"
 sphinx-autobuild==2021.3.14
 sphinx-book-theme==0.2.0
+sphinx-codeautolink==0.10.0
 sphinx-copybutton==0.4.0
 sphinx-panels==0.6.0
 sphinx-thebe==0.0.10
@@ -164,12 +166,12 @@ sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-sphobjinv==2.1
+sphobjinv==2.2
 sqlalchemy==1.4.31
 terminado==0.13.1
 testpath==0.5.0
 toml==0.10.2
-tomli==1.2.3
+tomli==2.0.0
 tornado==6.1
 tox==3.24.5
 tqdm==4.62.3
@@ -179,7 +181,7 @@ types-docutils==0.17.4
 types-pkg-resources==0.1.3
 types-pyyaml==6.0.3
 types-requests==2.27.7
-types-setuptools==57.4.7
+types-setuptools==57.4.8
 types-urllib3==1.26.7
 typing-extensions==4.0.1 ; python_version < "3.8.0"
 urllib3==1.26.8
diff --git a/.constraints/py3.8.txt b/.constraints/py3.8.txt
index 1df5589c..f0ae50e6 100644
--- a/.constraints/py3.8.txt
+++ b/.constraints/py3.8.txt
@@ -15,12 +15,12 @@ attrs==21.4.0
 babel==2.9.1
 backcall==0.2.0
 beautifulsoup4==4.10.0
-black==21.12b0
+black==22.1.0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
 cfgv==3.3.1
-charset-normalizer==2.0.10
+charset-normalizer==2.0.11
 click==8.0.3
 colorama==0.4.4
 coverage==6.3
@@ -45,7 +45,6 @@ flake8-pytest-style==1.6.0
 flake8-rst-docstrings==0.2.5
 flake8-type-ignore==0.1.0.post2 ; python_version >= "3.8.0"
 flake8-use-fstring==1.3
-fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.26
 gprof2dot==2021.2.21
@@ -77,6 +76,8 @@ jupyter-server-mathjax==0.2.3
 jupyter-sphinx==0.3.2
 jupyterlab==3.2.8
 jupyterlab-code-formatter==1.4.10
+jupyterlab-markup==1.0.1
+jupyterlab-myst==0.1.6 ; python_version >= "3.7.0"
 jupyterlab-pygments==0.1.2
 jupyterlab-server==2.10.3
 jupyterlab-widgets==1.0.2
@@ -156,6 +157,7 @@ soupsieve==2.3.1
 sphinx==4.4.0
 sphinx-autobuild==2021.3.14
 sphinx-book-theme==0.2.0
+sphinx-codeautolink==0.10.0
 sphinx-copybutton==0.4.0
 sphinx-panels==0.6.0
 sphinx-thebe==0.0.10
@@ -168,13 +170,13 @@ sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-sphobjinv==2.1
+sphobjinv==2.2
 sqlalchemy==1.4.31
 stack-data==0.1.4
 terminado==0.13.1
 testpath==0.5.0
 toml==0.10.2
-tomli==1.2.3
+tomli==2.0.0
 tornado==6.1
 tox==3.24.5
 tqdm==4.62.3
@@ -183,7 +185,7 @@ types-docutils==0.17.4
 types-pkg-resources==0.1.3
 types-pyyaml==6.0.3
 types-requests==2.27.7
-types-setuptools==57.4.7
+types-setuptools==57.4.8
 types-urllib3==1.26.7
 typing-extensions==4.0.1
 urllib3==1.26.8
diff --git a/.constraints/py3.9.txt b/.constraints/py3.9.txt
index 2497a887..99f72df4 100644
--- a/.constraints/py3.9.txt
+++ b/.constraints/py3.9.txt
@@ -15,12 +15,12 @@ attrs==21.4.0
 babel==2.9.1
 backcall==0.2.0
 beautifulsoup4==4.10.0
-black==21.12b0
+black==22.1.0
 bleach==4.1.0
 certifi==2021.10.8
 cffi==1.15.0
 cfgv==3.3.1
-charset-normalizer==2.0.10
+charset-normalizer==2.0.11
 click==8.0.3
 colorama==0.4.4
 coverage==6.3
@@ -45,7 +45,6 @@ flake8-pytest-style==1.6.0
 flake8-rst-docstrings==0.2.5
 flake8-type-ignore==0.1.0.post2 ; python_version >= "3.8.0"
 flake8-use-fstring==1.3
-fuzzywuzzy==0.18.0
 gitdb==4.0.9
 gitpython==3.1.26
 gprof2dot==2021.2.21
@@ -76,6 +75,8 @@ jupyter-server-mathjax==0.2.3
 jupyter-sphinx==0.3.2
 jupyterlab==3.2.8
 jupyterlab-code-formatter==1.4.10
+jupyterlab-markup==1.0.1
+jupyterlab-myst==0.1.6 ; python_version >= "3.7.0"
 jupyterlab-pygments==0.1.2
 jupyterlab-server==2.10.3
 jupyterlab-widgets==1.0.2
@@ -155,6 +156,7 @@ soupsieve==2.3.1
 sphinx==4.4.0
 sphinx-autobuild==2021.3.14
 sphinx-book-theme==0.2.0
+sphinx-codeautolink==0.10.0
 sphinx-copybutton==0.4.0
 sphinx-panels==0.6.0
 sphinx-thebe==0.0.10
@@ -167,13 +169,13 @@ sphinxcontrib-htmlhelp==2.0.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-sphobjinv==2.1
+sphobjinv==2.2
 sqlalchemy==1.4.31
 stack-data==0.1.4
 terminado==0.13.1
 testpath==0.5.0
 toml==0.10.2
-tomli==1.2.3
+tomli==2.0.0
 tornado==6.1
 tox==3.24.5
 tqdm==4.62.3
@@ -182,7 +184,7 @@ types-docutils==0.17.4
 types-pkg-resources==0.1.3
 types-pyyaml==6.0.3
 types-requests==2.27.7
-types-setuptools==57.4.7
+types-setuptools==57.4.8
 types-urllib3==1.26.7
 typing-extensions==4.0.1
 urllib3==1.26.8
diff --git a/.cspell.json b/.cspell.json
index f330ca5f..13aa4202 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -128,6 +128,7 @@
         "colab",
         "commitlint",
         "compwa",
+        "concat",
         "conds",
         "displaystyle",
         "doctest",
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b6881377..a47ce9e6 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: 0.0.99
+    rev: 0.0.101
     hooks:
       - id: check-dev-files
         args:
@@ -55,12 +55,12 @@ repos:
       - id: format-setup-cfg
 
   - repo: https://github.com/psf/black
-    rev: 21.12b0
+    rev: 22.1.0
     hooks:
       - id: black
 
   - repo: https://github.com/asottile/blacken-docs
-    rev: v1.12.0
+    rev: v1.12.1
     hooks:
       - id: blacken-docs
 
@@ -101,6 +101,8 @@ repos:
     rev: 1.2.3
     hooks:
       - id: nbqa-black
+        additional_dependencies:
+          - black>=22.1.0
       - id: nbqa-flake8
       - id: nbqa-isort
 
diff --git a/docs/abbreviate_signature.py b/docs/_relink_references.py
similarity index 64%
rename from docs/abbreviate_signature.py
rename to docs/_relink_references.py
index 45a66434..f897ad2d 100644
--- a/docs/abbreviate_signature.py
+++ b/docs/_relink_references.py
@@ -1,5 +1,5 @@
 # cspell:ignore docutils
-# pylint: disable=import-error
+# pylint: disable=import-error, import-outside-toplevel
 # pyright: reportMissingImports=false
 """Abbreviated the annotations generated by sphinx-autodoc.
 
@@ -9,13 +9,14 @@
 See also https://github.com/sphinx-doc/sphinx/issues/5868.
 """
 
-import sphinx.domains.python
-from docutils import nodes
-from sphinx import addnodes
-from sphinx.environment import BuildEnvironment
+from typing import TYPE_CHECKING
 
+if TYPE_CHECKING:
+    from sphinx.addnodes import pending_xref
+    from sphinx.environment import BuildEnvironment
 
-def replace_link(text: str) -> str:
+
+def _replace_link(text: str) -> str:
     replacements = {
         "a set-like object providing a view on D's items": "typing.ItemsView",
         "a set-like object providing a view on D's keys": "typing.KeysView",
@@ -28,9 +29,9 @@ def replace_link(text: str) -> str:
     return text
 
 
-def new_type_to_xref(
-    text: str, env: BuildEnvironment = None
-) -> addnodes.pending_xref:
+def _new_type_to_xref(
+    text: str, env: "BuildEnvironment" = None
+) -> "pending_xref":
     """Convert a type string to a cross reference node."""
     if text == "None":
         reftype = "obj"
@@ -45,12 +46,15 @@ def new_type_to_xref(
     else:
         kwargs = {}
 
-    text = replace_link(text)
+    text = _replace_link(text)
     short_text = text.split(".")[-1]
 
-    return addnodes.pending_xref(
+    from docutils.nodes import Text
+    from sphinx.addnodes import pending_xref
+
+    return pending_xref(
         "",
-        nodes.Text(short_text),
+        Text(short_text),
         refdomain="py",
         reftype=reftype,
         reftarget=text,
@@ -58,5 +62,7 @@ def new_type_to_xref(
     )
 
 
-def abbreviate_signature() -> None:
-    sphinx.domains.python.type_to_xref = new_type_to_xref
+def relink_references() -> None:
+    import sphinx.domains.python
+
+    sphinx.domains.python.type_to_xref = _new_type_to_xref  # type: ignore[assignment]
diff --git a/docs/conf.py b/docs/conf.py
index a4c20f8b..41b1a4be 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -73,9 +73,9 @@ def fetch_logo(url: str, output_path: str) -> None:
 
 # -- Generate API ------------------------------------------------------------
 sys.path.insert(0, os.path.abspath("."))
-from abbreviate_signature import abbreviate_signature  # noqa: E402
+from _relink_references import relink_references  # noqa: E402
 
-abbreviate_signature()
+relink_references()
 shutil.rmtree("api", ignore_errors=True)
 subprocess.call(
     " ".join(
@@ -145,6 +145,7 @@ def fetch_logo(url: str, output_path: str) -> None:
     "sphinx.ext.mathjax",
     "sphinx.ext.napoleon",
     "sphinx.ext.viewcode",
+    "sphinx_codeautolink",
     "sphinx_copybutton",
     "sphinx_panels",
     "sphinx_thebe",
@@ -172,6 +173,7 @@ def fetch_logo(url: str, output_path: str) -> None:
         ]
     ),
 }
+codeautolink_concat_default = True
 AUTODOC_INSERT_SIGNATURE_LINEBREAKS = True
 graphviz_output_format = "svg"
 html_copy_source = True  # needed for download notebook button
diff --git a/docs/usage.ipynb b/docs/usage.ipynb
index b0a8fc5d..76ba3732 100644
--- a/docs/usage.ipynb
+++ b/docs/usage.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
diff --git a/docs/usage/conservation.ipynb b/docs/usage/conservation.ipynb
index b002790d..97c1d083 100644
--- a/docs/usage/conservation.ipynb
+++ b/docs/usage/conservation.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
diff --git a/docs/usage/custom-topology.ipynb b/docs/usage/custom-topology.ipynb
index 51a4bd51..022116eb 100644
--- a/docs/usage/custom-topology.ipynb
+++ b/docs/usage/custom-topology.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
diff --git a/docs/usage/ls-coupling.ipynb b/docs/usage/ls-coupling.ipynb
index 99173db9..59f009c9 100644
--- a/docs/usage/ls-coupling.ipynb
+++ b/docs/usage/ls-coupling.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -104,7 +112,7 @@
     "        spin = int(particle.spin)\n",
     "    else:\n",
     "        nominator = int(particle.spin * 2)\n",
-    "        spin = fR\"\\tfrac{{{nominator}}}{2}\"\n",
+    "        spin = Rf\"\\tfrac{{{nominator}}}{2}\"\n",
     "    latex_expressions.append(f\"{particle.latex}={spin}^{parity}\")\n",
     "Math(R\"\\qquad \".join(latex_expressions))"
    ]
diff --git a/docs/usage/particle.ipynb b/docs/usage/particle.ipynb
index bddf7f6c..8e90b606 100644
--- a/docs/usage/particle.ipynb
+++ b/docs/usage/particle.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
diff --git a/docs/usage/reaction.ipynb b/docs/usage/reaction.ipynb
index fba7f2ea..376e7576 100644
--- a/docs/usage/reaction.ipynb
+++ b/docs/usage/reaction.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -153,7 +161,7 @@
    "source": [
     ":::{tip}\n",
     "\n",
-    "{doc}`custom-topology` shows how to provide custom `.Topology` instances to the STM, so that you generate more than just isobar decays.\n",
+    "{doc}`custom-topology` shows how to provide custom {class}`.Topology` instances to the STM, so that you generate more than just isobar decays.\n",
     "\n",
     ":::"
    ]
diff --git a/docs/usage/visualize.ipynb b/docs/usage/visualize.ipynb
index afdac172..da19a400 100644
--- a/docs/usage/visualize.ipynb
+++ b/docs/usage/visualize.ipynb
@@ -49,6 +49,14 @@
     "%pip install -q qrules[doc,viz] IPython"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{autolink-concat}\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -373,7 +381,7 @@
    "metadata": {},
    "source": [
     "```{note}\n",
-    "By default, `.asdot` renders edge IDs, because they represent the (final) state IDs as well. In the example above, we switched this off.\n",
+    "By default, {func}`.asdot` renders edge IDs, because they represent the (final) state IDs as well. In the example above, we switched this off.\n",
     "```"
    ]
   },
@@ -433,7 +441,7 @@
     "        \"style\": \"dashed\",\n",
     "    },\n",
     ")\n",
-    "display(graphviz.Source(dot))\n"
+    "display(graphviz.Source(dot))"
    ]
   }
  ],
diff --git a/pyproject.toml b/pyproject.toml
index 1490b9ec..fd0f21fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,9 +22,9 @@ exclude = '''
     | dist
 )/
 '''
-experimental-string-processing = true
 include = '\.pyi?$'
 line-length = 79
+preview = true
 target-version = [
     "py36",
     "py37",
diff --git a/setup.cfg b/setup.cfg
index 8b48be62..bb0f25d2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -67,6 +67,7 @@ doc =
     Sphinx >=3
     Sphinx <4.4; python_version <"3.8.0"  # https://github.com/ComPWA/qrules/runs/4833302679
     sphinx-book-theme
+    sphinx-codeautolink[ipython]
     sphinx-copybutton
     sphinx-panels
     sphinx-thebe
@@ -121,6 +122,7 @@ dev =
     aquirdturtle-collapsible-headings
     jupyterlab
     jupyterlab-code-formatter
+    jupyterlab-myst; python_version >="3.7.0"
     pip-tools >=6.1.0  # for extras_require
     sphinx-autobuild
     tox >=1.9  # for skip_install, use_develop
diff --git a/src/qrules/particle.py b/src/qrules/particle.py
index d1d9551b..b7379b0a 100644
--- a/src/qrules/particle.py
+++ b/src/qrules/particle.py
@@ -512,7 +512,7 @@ def create_antiparticle(
         pid=-template_particle.pid,
         latex=new_latex
         if new_latex
-        else fR"\overline{{{template_particle.latex}}}",
+        else Rf"\overline{{{template_particle.latex}}}",
         mass=template_particle.mass,
         width=template_particle.width,
         charge=-template_particle.charge,