diff --git a/CHANGELOG.md b/CHANGELOG.md
index caaeccc..13a8138 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+### 2.4.0
+- add tab audio indicators for Pale Moon 28.3.0+
+- update in-browser developer tools
+
 ### 2.3.0
 - use non-prefixed -inline syntax
 - cleanup internal files
diff --git a/src/install.rdf b/src/install.rdf
index a02dca5..f774d73 100644
--- a/src/install.rdf
+++ b/src/install.rdf
@@ -9,7 +9,7 @@
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>{d2da57e2-a0d3-4b59-b98e-98e62085837f}</em:id>
-    <em:version>2.3.0</em:version>
+    <em:version>2.4.0</em:version>
     <em:name>Tangomoon</em:name>
     <em:description>Theme with Tango icons for Pale Moon. Fork of "Tangofox" by Haven667</em:description>
     <em:creator>Lootyhoof</em:creator>