diff --git a/CHANGELOG.md b/CHANGELOG.md
index c08e03f3e..6760ef33f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@
     * Added `theme_var` and `body_class` Twig functions that are useful for themes
 1. [](#improved)
     * Updated vendor libraries to latest version
+1. [](#bugfix)
+    * Fixed `BadMethodCallException` thrown in GPM updates [#1784](https://github.com/getgrav/grav/issues/1784)
 
 # v1.4.0-beta.1
 ## 12/11/2017
diff --git a/system/src/Grav/Common/GPM/Common/Package.php b/system/src/Grav/Common/GPM/Common/Package.php
index 468ca9e9c..ce25d57d2 100644
--- a/system/src/Grav/Common/GPM/Common/Package.php
+++ b/system/src/Grav/Common/GPM/Common/Package.php
@@ -35,7 +35,7 @@ class Package {
     }
 
     public function __set($key, $value) {
-        throw new \BadMethodCallException('Not Implemented');
+        $this->data->set($key, $value);
     }
 
     public function __toString() {