diff --git a/CHANGES.md b/CHANGES.md
index 6618378c06..58775e3519 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,14 @@
+Synapse 1.55.1 (2022-03-24)
+===========================
+
+This is a patch release that fixes an incompatibility with version 3.1.0 of the Jinja2 library, released on March 24th, 2022. Deployments of Synapse using the official Docker images or Debian packages are not affected.
+
+Internal Changes
+----------------
+
+- Remove uses of the long-deprecated `Jinja2.Markup` which would prevent Synapse from starting with Jinja2 3.1.0 or above installed. ([\#12289](https://github.com/matrix-org/synapse/issues/12289))
+
+
 Synapse 1.55.0 (2022-03-22)
 ===========================
 
diff --git a/changelog.d/12289.misc b/changelog.d/12289.misc
deleted file mode 100644
index f80ccf3284..0000000000
--- a/changelog.d/12289.misc
+++ /dev/null
@@ -1 +0,0 @@
-Remove uses of the long-deprecated `Jinja2.Markup` which would prevent Synapse from starting with Jinja2 3.1.0 or above installed. This does not affect deployments of Synapse using our Docker images or Debian packages.
\ No newline at end of file
diff --git a/debian/changelog b/debian/changelog
index 7eed6c5b4a..f3ac279302 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.55.1) stable; urgency=medium
+
+  * New synapse release 1.55.1.
+
+ -- Synapse Packaging team <packages@matrix.org>  Thu, 24 Mar 2022 17:44:23 +0000
+
 matrix-synapse-py3 (1.55.0) stable; urgency=medium
 
   * New synapse release 1.55.0.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index f0f224d0bb..70f56824f9 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -68,7 +68,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.55.0"
+__version__ = "1.55.1"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when