diff --git a/pyproject.toml b/pyproject.toml
index d5d988f4..93aeb6d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ classifiers = [
 ]
 dependencies = [
     "attrs >=20.1.0", # on_setattr and https://www.attrs.org/en/stable/api.html#next-gen
-    "qrules @ git+https://github.com/ComPWA/qrules@47e0c29",
+    "qrules @ git+https://github.com/ComPWA/qrules@e32e78c",
     "sympy >=1.10",
     "xxhash>=3.5.0",
 ]
diff --git a/src/ampform/helicity/naming.py b/src/ampform/helicity/naming.py
index 9cdaff65..59acb525 100644
--- a/src/ampform/helicity/naming.py
+++ b/src/ampform/helicity/naming.py
@@ -27,6 +27,7 @@
     from typing_extensions import override
 if TYPE_CHECKING:
     from collections.abc import Iterable
+    from fractions import Fraction
 
     from qrules.topology import Topology
 
@@ -503,7 +504,7 @@ def _state_to_str(
     return output_string
 
 
-def _render_float(value: float) -> str:
+def _render_float(value: float | Fraction) -> str:
     """Render a `float` nicely as a string.
 
     >>> _render_float(-0.5)
diff --git a/uv.lock b/uv.lock
index dfed9b63..f5a9fb25 100644
--- a/uv.lock
+++ b/uv.lock
@@ -193,7 +193,7 @@ types = [
 requires-dist = [
     { name = "attrs", specifier = ">=20.1.0" },
     { name = "graphviz", marker = "extra == 'viz'" },
-    { name = "qrules", git = "https://github.com/ComPWA/qrules?rev=47e0c29" },
+    { name = "qrules", git = "https://github.com/ComPWA/qrules?rev=e32e78c" },
     { name = "scipy", marker = "extra == 'scipy'" },
     { name = "sympy", specifier = ">=1.10" },
     { name = "xxhash", specifier = ">=3.5.0" },
@@ -3089,7 +3089,7 @@ wheels = [
 [[package]]
 name = "qrules"
 version = "0.10.2"
-source = { git = "https://github.com/ComPWA/qrules?rev=47e0c29#47e0c29bc4d89b0215e8d730fe9e4858067d1e88" }
+source = { git = "https://github.com/ComPWA/qrules?rev=e32e78c#e32e78ca7f113efe908bd76cf1dc43c5ca6a7b3e" }
 dependencies = [
     { name = "attrs" },
     { name = "frozendict" },