diff --git a/HISTORY.md b/HISTORY.md
index 491db91..8a03025 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,5 @@
-unreleased
-==========
+0.5.1 / 2015-02-14
+==================
 
   * Fix preference sorting to be stable for long acceptable lists
 
diff --git a/package.json b/package.json
index c4ea3b3..d5e190c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "negotiator",
   "description": "HTTP content negotiation",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "contributors": [
     "Douglas Christopher Wilson <doug@somethingdoug.com>",
     "Federico Romero <federico.romero@outboxlabs.com>",