diff --git a/SlackNet.Tests/SlackNet.Tests.csproj b/SlackNet.Tests/SlackNet.Tests.csproj
index 1ef7450..7d34de9 100644
--- a/SlackNet.Tests/SlackNet.Tests.csproj
+++ b/SlackNet.Tests/SlackNet.Tests.csproj
@@ -7,11 +7,11 @@
 
   <ItemGroup>
     <PackageReference Include="EasyAssertions" Version="2.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="3.1.1" />
-    <PackageReference Include="NSubstitute" Version="3.0.1" />
-    <PackageReference Include="NUnit" Version="3.8.1" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.8.0" />
+    <PackageReference Include="NSubstitute" Version="3.1.0" />
+    <PackageReference Include="NUnit" Version="3.9.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.9.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/SlackNet/SlackNet.csproj b/SlackNet/SlackNet.csproj
index 809d8bf..8a009d5 100644
--- a/SlackNet/SlackNet.csproj
+++ b/SlackNet/SlackNet.csproj
@@ -18,7 +18,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
     <PackageReference Include="System.Reactive.Linq" Version="3.1.1" />
-    <PackageReference Include="WebSocket4Net" Version="0.15.0-beta9" />
+    <PackageReference Include="WebSocket4Net" Version="0.15.1" />
   </ItemGroup>
 
 </Project>
\ No newline at end of file