diff --git a/MessageBird/MessageBird.csproj b/MessageBird/MessageBird.csproj
index 760e141..60e3311 100644
--- a/MessageBird/MessageBird.csproj
+++ b/MessageBird/MessageBird.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net40;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net45;net40;netstandard2.0</TargetFrameworks>
     <Product>MessageBird</Product>
     <Title>MessageBird</Title>
     <Company>MessageBird</Company>
@@ -19,4 +19,4 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/MessageBird/Net/RestClient.cs b/MessageBird/Net/RestClient.cs
index 4b2e2bc..71f67b9 100644
--- a/MessageBird/Net/RestClient.cs
+++ b/MessageBird/Net/RestClient.cs
@@ -257,6 +257,9 @@ private HttpWebRequest PrepareRequest(string method, string requestUriString, st
             // TODO: ##jwp; need to find out why .NET 4.0 under VS2013 refuses to recognize `WebRequest.CreateHttp`.
             // HttpWebRequest request = WebRequest.CreateHttp(uri);
             var request = WebRequest.Create(uri) as HttpWebRequest;
+            #if NET45
+            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
+            #endif
             request.UserAgent = UserAgent;
             const string ApplicationJsonContentType = "application/json"; // http://tools.ietf.org/html/rfc4627
             request.Accept = ApplicationJsonContentType;