diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c4b7b4..7bbf8a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [0.5.1]
+
+### Fixed
+- Use Timex.DateTime.now, rather than Timex.DateTime.today (thanks to [@radar](https://github.com/radar))
+
 ## [0.5.0]
 
 ### Fixed
diff --git a/mix.exs b/mix.exs
index 7cdf8b6..31d6f65 100644
--- a/mix.exs
+++ b/mix.exs
@@ -3,7 +3,7 @@ defmodule AWSAuth.Mixfile do
 
   def project do
     [app: :aws_auth,
-     version: "0.5.0",
+     version: "0.5.1",
      elixir: "~> 1.0",
      description: description,
      package: package,