diff --git a/changelog.d/14085.misc b/changelog.d/14085.misc
new file mode 100644
index 000000000000..2d2df70a64ef
--- /dev/null
+++ b/changelog.d/14085.misc
@@ -0,0 +1 @@
+Rename the `url_preview` extra to `url-preview`, for compatability with poetry-core 1.3.0 and [PEP 685](https://peps.python.org/pep-0685/). From-source installations using this extra will need to install using the new name.
diff --git a/pyproject.toml b/pyproject.toml
index 622d6a9e892d..81b2659eb1fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -219,7 +219,7 @@ oidc = ["authlib"]
 # `systemd.journal.JournalHandler`, as is documented in
 # `contrib/systemd/log_config.yaml`.
 systemd = ["systemd-python"]
-url_preview = ["lxml"]
+url-preview = ["lxml"]
 sentry = ["sentry-sdk"]
 opentracing = ["jaeger-client", "opentracing"]
 jwt = ["authlib"]
@@ -250,7 +250,7 @@ all = [
     "pysaml2",
     # oidc and jwt
     "authlib",
-    # url_preview
+    # url-preview
     "lxml",
     # sentry
     "sentry-sdk",
@@ -307,7 +307,12 @@ twine = "*"
 towncrier = ">=18.6.0rc1"
 
 [build-system]
-requires = ["poetry-core==1.2.0", "setuptools_rust==1.5.2"]
+# The upper bounds here are defensive, intended to prevent situations like
+# #13849 and #14079 where we see buildtime or 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>=1.0.0,<=1.3.1", "setuptools_rust>=1.3,<=1.5.2"]
 build-backend = "poetry.core.masonry.api"
 
 
diff --git a/synapse/config/repository.py b/synapse/config/repository.py
index 1033496bb43d..e4759711ed95 100644
--- a/synapse/config/repository.py
+++ b/synapse/config/repository.py
@@ -205,7 +205,7 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None:
         )
         self.url_preview_enabled = config.get("url_preview_enabled", False)
         if self.url_preview_enabled:
-            check_requirements("url_preview")
+            check_requirements("url-preview")
 
             proxy_env = getproxies_environment()
             if "url_preview_ip_range_blacklist" not in config: