diff --git a/src/Slack.Webhooks.Tests/packages.config b/src/Slack.Webhooks.Tests/packages.config
index b5757f0..c274243 100644
--- a/src/Slack.Webhooks.Tests/packages.config
+++ b/src/Slack.Webhooks.Tests/packages.config
@@ -12,7 +12,7 @@
   <package id="System.IO.Compression" version="4.3.0" targetFramework="net45" />
   <package id="System.Linq" version="4.3.0" targetFramework="net45" />
   <package id="System.Linq.Expressions" version="4.3.0" targetFramework="net45" />
-  <package id="System.Net.Http" version="4.3.3" targetFramework="net45" />
+  <package id="System.Net.Http" version="4.3.4" targetFramework="net45" />
   <package id="System.Net.Primitives" version="4.3.0" targetFramework="net45" />
   <package id="System.ObjectModel" version="4.3.0" targetFramework="net45" />
   <package id="System.Reflection" version="4.3.0" targetFramework="net45" />