diff --git a/doc/build/changelog.rst b/doc/build/changelog.rst
index ea46e6c0..35a7253a 100644
--- a/doc/build/changelog.rst
+++ b/doc/build/changelog.rst
@@ -8,7 +8,16 @@ Changelog
 
 .. changelog::
     :version: 1.3.1
-    :include_notes_from: unreleased
+    :released: Mon Jan 22 2024
+
+    .. change::
+        :tags: bug, lexer
+        :tickets: 323
+
+        Fixed parsing issue where attempting to render a single percent sign ``%``
+        using an escaped percent ``%%`` would not function correctly if the escaped
+        percent were not the first character on a line.  Pull request courtesy Hai
+        Zhu.
 
 .. changelog::
     :version: 1.3.0
diff --git a/doc/build/conf.py b/doc/build/conf.py
index 6c756981..6cdfbbce 100644
--- a/doc/build/conf.py
+++ b/doc/build/conf.py
@@ -87,8 +87,8 @@
 # The short X.Y version.
 version = mako.__version__
 # The full version, including alpha/beta/rc tags.
-release = "1.3.0"
-release_date = "Wed Nov 8 2023"
+release = "1.3.1"
+release_date = "Mon Jan 22 2024"
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 # language = None
diff --git a/doc/build/unreleased/323.rst b/doc/build/unreleased/323.rst
deleted file mode 100644
index 8f23d8be..00000000
--- a/doc/build/unreleased/323.rst
+++ /dev/null
@@ -1,8 +0,0 @@
-.. change::
-    :tags: bug, lexer
-    :tickets: 323
-
-    Fixed parsing issue where attempting to render a single percent sign ``%``
-    using an escaped percent ``%%`` would not function correctly if the escaped
-    percent were not the first character on a line.  Pull request courtesy Hai
-    Zhu.