diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index a861647ca0..bd9cf5ad47 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -39,6 +39,12 @@ Changelog
  * Fix: Prevent crash when copying a page from a section where the user has no publish permission (Karl Hobley)
 
 
+2.13.4 (13.07.2021)
+~~~~~~~~~~~~~~~~~~~
+
+ * Fix: Prevent embed thumbnail_url migration from failing on URLs longer than 200 characters (Matt Westcott)
+
+
 2.13.3 (05.07.2021)
 ~~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/releases/2.13.4.rst b/docs/releases/2.13.4.rst
new file mode 100644
index 0000000000..51c57a48a6
--- /dev/null
+++ b/docs/releases/2.13.4.rst
@@ -0,0 +1,16 @@
+============================
+Wagtail 2.13.4 release notes
+============================
+
+.. contents::
+    :local:
+    :depth: 1
+
+
+What's new
+==========
+
+Bug fixes
+~~~~~~~~~
+
+ * Prevent embed thumbnail_url migration from failing on URLs longer than 200 characters (Matt Westcott)
diff --git a/docs/releases/index.rst b/docs/releases/index.rst
index 1804926f9e..36d823f854 100644
--- a/docs/releases/index.rst
+++ b/docs/releases/index.rst
@@ -6,6 +6,7 @@ Release notes
 
    upgrading
    2.14
+   2.13.4
    2.13.3
    2.13.2
    2.13.1