diff --git a/CHANGES b/CHANGES
index 89c6d9ef..20c79635 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,4 @@
-Development
+5.1.1 (2023-05-16)
 
   * Support lambda functions as shortcuts - #677 #813 #903
   * Support --enable-frozen-string-literal - #851
diff --git a/lib/slim/version.rb b/lib/slim/version.rb
index 34e5ff8e..01325e28 100644
--- a/lib/slim/version.rb
+++ b/lib/slim/version.rb
@@ -2,5 +2,5 @@
 module Slim
   # Slim version string
   # @api public
-  VERSION = '5.1.0'
+  VERSION = '5.1.1'
 end