diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81c14ba..1e81473 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,18 @@ Docs changes in `main` that are *not* in the latest release:
 
 - N/A
 
+## Release v0.5.4
+
+Hi all, this is a small patch release that only includes one change: fixing a style clash between Mermaid's labels and Just the Docs' labels.
+
+*Note: for subsequent patch releases, we will omit migration instructions (for brevity). In all cases, immediate migration should be backwards-compatible. Refer to previous major or minor update instructions for more information.*
+
+### Bugfixes
+
+- Fixed: Mermaid labels inheriting theme `.label` styling by [@mattxwang] in [#1278]
+
+[#1278]: https://github.com/just-the-docs/just-the-docs/pull/1278
+
 ## Release v0.5.3
 
 Hi all, this is a minor patch release that only includes one change: changing all text-based CSS properties to use `rem` instead of hard-coded `px` values. This has two effects:
diff --git a/just-the-docs.gemspec b/just-the-docs.gemspec
index c2c7a7c..6c656c5 100644
--- a/just-the-docs.gemspec
+++ b/just-the-docs.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "just-the-docs"
-  spec.version       = "0.5.3"
+  spec.version       = "0.5.4"
   spec.authors       = ["Patrick Marsceill", "Matthew Wang"]
   spec.email         = ["patrick.marsceill@gmail.com", "matt@matthewwang.me"]