diff --git a/rubberduckvba.Server/GitHubAuthenticationHandler.cs b/rubberduckvba.Server/GitHubAuthenticationHandler.cs
index b9e3a44..c833d74 100644
--- a/rubberduckvba.Server/GitHubAuthenticationHandler.cs
+++ b/rubberduckvba.Server/GitHubAuthenticationHandler.cs
@@ -75,7 +75,9 @@ protected async override Task<AuthenticateResult> HandleAuthenticateAsync()
             }
 
             var signature = xHubSignature256.SingleOrDefault();
-            var payload = new StreamReader(Context.Request.Body).ReadToEnd();
+
+            using var reader = new StreamReader(Context.Request.Body);
+            var payload = reader.ReadToEndAsync().GetAwaiter().GetResult();
 
             if (!IsValidSignature(signature, payload))
             {