diff --git a/changelog.d/18575.misc b/changelog.d/18575.misc
new file mode 100644
index 00000000000..0033f27df84
--- /dev/null
+++ b/changelog.d/18575.misc
@@ -0,0 +1 @@
+Raise poetry-core version cap to 2.1.3.
diff --git a/pyproject.toml b/pyproject.toml
index a0b89814544..6b1c6e59d59 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -374,7 +374,7 @@ tomli = ">=1.2.3"
 # runtime errors caused by build system changes.
 # We are happy to raise these upper bounds upon request,
 # provided we check that it's safe to do so (i.e. that CI passes).
-requires = ["poetry-core>=1.1.0,<=1.9.1", "setuptools_rust>=1.3,<=1.10.2"]
+requires = ["poetry-core>=1.1.0,<=2.1.3", "setuptools_rust>=1.3,<=1.10.2"]
 build-backend = "poetry.core.masonry.api"