diff --git a/HISTORY.md b/HISTORY.md
index f2dd739..2457d5c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,5 @@
-unreleased
-==========
+0.5.1 / 2017-09-11
+==================
 
   * Fix handling of modified headers with invalid dates
   * perf: improve ETag match loop
diff --git a/package.json b/package.json
index 7c1e4f4..7ea5f7a 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "fresh",
   "description": "HTTP response freshness testing",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "author": "TJ Holowaychuk <tj@vision-media.ca> (http://tjholowaychuk.com)",
   "contributors": [
     "Douglas Christopher Wilson <doug@somethingdoug.com>",