diff --git a/14221.patch b/14221.patch
deleted file mode 100644
index b98ae85..0000000
--- a/14221.patch
+++ /dev/null
@@ -1,71 +0,0 @@
-From ce2c268f22ab30ef589a8370b691703dad44819f Mon Sep 17 00:00:00 2001
-From: David Robertson <davidr@element.io>
-Date: Tue, 18 Oct 2022 12:08:50 +0100
-Subject: [PATCH 1/2] Fix `track_memory_usage` on poetry-core 1.3.x
- installations
-
-The same kind of problem as discussed in #14085:
-
-1. we defined an extra with an underscore
-2. we look it up at runtime with an underscore
-3. but poetry-core 1.3.x. installs it with a dash, causing (2) to fail.
-
-Fix by using a dash everywhere.
----
- pyproject.toml          | 4 ++--
- synapse/config/cache.py | 2 +-
- 2 files changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/pyproject.toml b/pyproject.toml
-index 78ff799e8ec..aa1b816b264 100644
---- a/pyproject.toml
-+++ b/pyproject.toml
-@@ -227,7 +227,7 @@ jwt = ["authlib"]
- # (if it is not installed, we fall back to slow code.)
- redis = ["txredisapi", "hiredis"]
- # Required to use experimental `caches.track_memory_usage` config option.
--cache_memory = ["pympler"]
-+cache-memory = ["pympler"]
- test = ["parameterized", "idna"]
- 
- # The duplication here is awful. I hate hate hate hate hate it. However, for now I want
-@@ -258,7 +258,7 @@ all = [
-     "jaeger-client", "opentracing",
-     # redis
-     "txredisapi", "hiredis",
--    # cache_memory
-+    # cache-memory
-     "pympler",
-     # omitted:
-     #   - test: it's useful to have this separate from dev deps in the olddeps job
-diff --git a/synapse/config/cache.py b/synapse/config/cache.py
-index 2db8cfb0052..eb4194a5a91 100644
---- a/synapse/config/cache.py
-+++ b/synapse/config/cache.py
-@@ -159,7 +159,7 @@ def read_config(self, config: JsonDict, **kwargs: Any) -> None:
- 
-         self.track_memory_usage = cache_config.get("track_memory_usage", False)
-         if self.track_memory_usage:
--            check_requirements("cache_memory")
-+            check_requirements("cache-memory")
- 
-         expire_caches = cache_config.get("expire_caches", True)
-         cache_entry_ttl = cache_config.get("cache_entry_ttl", "30m")
-
-From 011ec6c4f2f0a4323a4fcb2949c0e2875b4dad3c Mon Sep 17 00:00:00 2001
-From: David Robertson <davidr@element.io>
-Date: Tue, 18 Oct 2022 12:58:54 +0100
-Subject: [PATCH 2/2] Changelog
-
----
- changelog.d/14221.misc | 1 +
- 1 file changed, 1 insertion(+)
- create mode 100644 changelog.d/14221.misc
-
-diff --git a/changelog.d/14221.misc b/changelog.d/14221.misc
-new file mode 100644
-index 00000000000..fe7afac245f
---- /dev/null
-+++ b/changelog.d/14221.misc
-@@ -0,0 +1 @@
-+Rename the `cache_memory` extra to `cache-memory`, 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.