diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a673eb..ef8233b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## 0.4.0 (2018-12-30)
+
+* Revert swich from proto2 to proto3
+* Verify authenticity of signed payload
+* Add `repo_verify_origin` config option
+
 ## 0.3.0 (2018-12-14)
 
 * Swich from proto2 to proto3
diff --git a/doc/tpl.html b/doc/tpl.html
index 0df9d5c..3b552fb 100644
--- a/doc/tpl.html
+++ b/doc/tpl.html
@@ -20,7 +20,7 @@ <h1 style="margin-top: 0;margin-bottom: 0;text-align:center;">
             <span style="color: #3d3d3d;font-weight: 300;font-size: 20px;">hex_core</span>
           </h1>
           <h2 style="margin-top: 0;margin-bottom: 0;text-align:center;">
-            <span style="color: #3d3d3d;font-weight: 300;font-size: 18px;">v0.3.0</span>
+            <span style="color: #3d3d3d;font-weight: 300;font-size: 18px;">v0.4.0</span>
           </h2>
         </div>
 
diff --git a/src/hex_core.app.src b/src/hex_core.app.src
index 79046f9..14cf425 100644
--- a/src/hex_core.app.src
+++ b/src/hex_core.app.src
@@ -1,6 +1,6 @@
 {application, hex_core, [
   {description, "Reference implementation of Hex specifications"},
-  {vsn, "0.3.0"},
+  {vsn, "0.4.0"},
   {registered, []},
   {applications, [kernel, stdlib]},
   {licenses, ["Apache 2.0"]},
diff --git a/src/hex_core.hrl b/src/hex_core.hrl
index a998a07..533fb43 100644
--- a/src/hex_core.hrl
+++ b/src/hex_core.hrl
@@ -1 +1 @@
--define(HEX_CORE_VERSION, "0.2.0").
+-define(HEX_CORE_VERSION, "0.4.0").