diff --git a/CHANGES.md b/CHANGES.md
index 78498c10b..6618378c0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,8 +1,20 @@
-Synapse 1.55.0rc1 (2022-03-15)
-==============================
+Synapse 1.55.0 (2022-03-22)
+===========================
 
 This release removes a workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. **This breaks compatibility with Mjolnir 1.3.1 and earlier. ([\#11700](https://github.com/matrix-org/synapse/issues/11700))**; Mjolnir users should upgrade Mjolnir before upgrading Synapse to this version.
 
+This release also moves the location of the `synctl` script; see the [upgrade notes](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#synctl-script-has-been-moved) for more details.
+
+
+Internal Changes
+----------------
+
+- Tweak copy for default Single Sign-On account details template to better adhere to mobile app store guidelines. ([\#12265](https://github.com/matrix-org/synapse/issues/12265), [\#12260](https://github.com/matrix-org/synapse/issues/12260))
+
+
+Synapse 1.55.0rc1 (2022-03-15)
+==============================
+
 Features
 --------
 
@@ -38,6 +50,7 @@ Deprecations and Removals
 -------------------------
 
 - **Remove workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. Breaks compatibility with Mjolnir 1.3.1 and earlier. ([\#11700](https://github.com/matrix-org/synapse/issues/11700))**
+- **`synctl` has been moved into into `synapse._scripts` and is exposed as an entry point; see [upgrade notes](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#synctl-script-has-been-moved). ([\#12140](https://github.com/matrix-org/synapse/issues/12140))
 - Remove backwards compatibilty with pagination tokens from the `/relations` and `/aggregations` endpoints generated from Synapse < v1.52.0. ([\#12138](https://github.com/matrix-org/synapse/issues/12138))
 - The groups/communities feature in Synapse has been deprecated. ([\#12200](https://github.com/matrix-org/synapse/issues/12200))
 
@@ -56,7 +69,6 @@ Internal Changes
 - Fix CI not attaching source distributions and wheels to the GitHub releases. ([\#12131](https://github.com/matrix-org/synapse/issues/12131))
 - Remove unused mocks from `test_typing`. ([\#12136](https://github.com/matrix-org/synapse/issues/12136))
 - Give `scripts-dev` scripts suffixes for neater CI config. ([\#12137](https://github.com/matrix-org/synapse/issues/12137))
-- Move `synctl` into `synapse._scripts` and expose as an entry point. ([\#12140](https://github.com/matrix-org/synapse/issues/12140))
 - Move the snapcraft configuration file to `contrib`. ([\#12142](https://github.com/matrix-org/synapse/issues/12142))
 - Enable [MSC3030](https://github.com/matrix-org/matrix-doc/pull/3030) Complement tests in CI. ([\#12144](https://github.com/matrix-org/synapse/issues/12144))
 - Enable [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) Complement tests in CI. ([\#12145](https://github.com/matrix-org/synapse/issues/12145))
diff --git a/changelog.d/12260.misc b/changelog.d/12260.misc
deleted file mode 100644
index deacf034d..000000000
--- a/changelog.d/12260.misc
+++ /dev/null
@@ -1 +0,0 @@
-Reword 'Choose your user name' as 'Choose your account name' in the SSO registration template, in order to comply with SIWA guidelines.
\ No newline at end of file
diff --git a/debian/changelog b/debian/changelog
index 09ef24ebb..7eed6c5b4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.55.0) stable; urgency=medium
+
+  * New synapse release 1.55.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 22 Mar 2022 13:59:26 +0000
+
 matrix-synapse-py3 (1.55.0~rc1) stable; urgency=medium
 
   * New synapse release 1.55.0~rc1.
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 870707f47..f0f224d0b 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -68,7 +68,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.55.0rc1"
+__version__ = "1.55.0"
 
 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
diff --git a/synapse/res/templates/sso_auth_account_details.html b/synapse/res/templates/sso_auth_account_details.html
index b231aace0..1ba850369 100644
--- a/synapse/res/templates/sso_auth_account_details.html
+++ b/synapse/res/templates/sso_auth_account_details.html
@@ -130,13 +130,13 @@
   </head>
   <body>
     <header>
-      <h1>Choose your account name</h1>
-      <p>This is required to create your account on {{ server_name }}, and you can't change this later.</p>
+      <h1>Create your account</h1>
+      <p>This is required. Continue to create your account on {{ server_name }}. You can't change this later.</p>
     </header>
     <main>
       <form method="post" class="form__input" id="form">
         <div class="username_input" id="username_input">
-          <label for="field-username">Username</label>
+          <label for="field-username">Username (required)</label>
           <div class="prefix">@</div>
           <input type="text" name="username" id="field-username" value="{{ user_attributes.localpart }}" autofocus>
           <div class="postfix">:{{ server_name }}</div>
@@ -145,7 +145,7 @@
         <input type="submit" value="Continue" class="primary-button">
         {% if user_attributes.avatar_url or user_attributes.display_name or user_attributes.emails %}
         <section class="idp-pick-details">
-          <h2>{% if idp.idp_icon %}<img src="{{ idp.idp_icon | mxc_to_http(24, 24) }}"/>{% endif %}Information from {{ idp.idp_name }}</h2>
+          <h2>{% if idp.idp_icon %}<img src="{{ idp.idp_icon | mxc_to_http(24, 24) }}"/>{% endif %}Optional data from {{ idp.idp_name }}</h2>
           {% if user_attributes.avatar_url %}
           <label class="idp-detail idp-avatar" for="idp-avatar">
             <div class="check-row">
diff --git a/synapse/res/templates/sso_auth_account_details.js b/synapse/res/templates/sso_auth_account_details.js
index 3c45df907..82438519a 100644
--- a/synapse/res/templates/sso_auth_account_details.js
+++ b/synapse/res/templates/sso_auth_account_details.js
@@ -62,7 +62,7 @@ function validateUsername(username) {
     usernameField.parentElement.classList.remove("invalid");
     usernameOutput.classList.remove("error");
     if (!username) {
-        return reportError("Please provide a username");
+        return reportError("This is required. Please provide a username");
     }
     if (username.length > 255) {
         return reportError("Too long, please choose something shorter");
diff --git a/synapse/res/templates/sso_footer.html b/synapse/res/templates/sso_footer.html
index 588a3d508..b46e0d83f 100644
--- a/synapse/res/templates/sso_footer.html
+++ b/synapse/res/templates/sso_footer.html
@@ -15,5 +15,5 @@
               </g>
           </g>
       </svg>
-      <p>An open network for secure, decentralized communication.<br>© 2021 The Matrix.org Foundation C.I.C.</p>
+      <p>An open network for secure, decentralized communication.<br>© 2022 The Matrix.org Foundation C.I.C.</p>
 </footer>
\ No newline at end of file