diff --git a/CHANGELOG.md b/CHANGELOG.md
index 856c186b..642f2fc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## master
 
+## 4.0.1 (2017-04-25)
+
+* Enhancements
+  * Bump hackney to a version that fixes major bug (#153)
+
 ## 4.0.0 (2017-04-20)
 
 See these [`3.0.0` to `4.0.0` upgrade instructions](https://gist.github.com/mitchellhenke/5248b3073f113309fa25550a0e4126d4) to update your existing app.
diff --git a/mix.exs b/mix.exs
index 63bbde3d..c7f8624e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule Sentry.Mixfile do
   def project do
     [
       app: :sentry,
-      version: "4.0.0",
+      version: "4.0.1",
       elixir: "~> 1.3",
       description: "The Official Elixir client for Sentry",
       package: package(),