diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0bf80eb..69b42639 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.3.4
+
+- CSP: Do not deduplicate alternate schema source expressions (@keithamus): https://github.com/github/secure_headers/pull/478
+
 ## 6.3.3
 
 Fix hash generation for indented helper methods (@rahearn)
diff --git a/lib/secure_headers/version.rb b/lib/secure_headers/version.rb
index 57500044..22169825 100644
--- a/lib/secure_headers/version.rb
+++ b/lib/secure_headers/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module SecureHeaders
-  VERSION = "6.3.3"
+  VERSION = "6.3.4"
 end