diff --git a/build/NuSpecs/UmbracoCms.Core.nuspec b/build/NuSpecs/UmbracoCms.Core.nuspec
index c4aaf7344e..d043483c96 100644
--- a/build/NuSpecs/UmbracoCms.Core.nuspec
+++ b/build/NuSpecs/UmbracoCms.Core.nuspec
@@ -40,7 +40,8 @@
       <dependency id="semver" version="[1.1.2, 3.0.0)" />
 	    <!-- Markdown can not be updated due to: https://github.com/hey-red/markdownsharp/issues/71#issuecomment-233585487 -->
       <dependency id="Markdown" version="[1.14.7, 2.0.0)" />
-      <dependency id="System.Threading.Tasks.Dataflow" version="[4.7.0, 5.0.0)" />
+      <dependency id="System.Threading.Tasks.Dataflow" version="[4.7.0, 5.0.0)" />
+      <dependency id="Slack.Webhooks" version="[0.1.7, 1.0.0)" />
     </dependencies>
   </metadata>
   <files>