diff --git a/README.adoc b/README.adoc
index c4db45e..e51724d 100644
--- a/README.adoc
+++ b/README.adoc
@@ -4,7 +4,7 @@ C# client for Callfire platform API version 2. See link:docs/GettingStarted.adoc
  page for setup instructions.
 
 .*Requirements:*
-* .NET 4.0+
+* .NET 4.5+
 
 .*Dependencies:*
 * Newtonsoft.Json >= 7.0.1
diff --git a/docs/GettingStarted.adoc b/docs/GettingStarted.adoc
index 6ccdf43..85ea2e1 100644
--- a/docs/GettingStarted.adoc
+++ b/docs/GettingStarted.adoc
@@ -146,7 +146,7 @@ http://www.symbolsource.org/Public/Home/VisualStudio
 
 == Platform compatibility
 
-Library was built and tested on OS X with mono 4.2.1 .NET 4 and Windows 7 x64 .NET 4 platform
+Library was built and tested on OS X with mono 4.2.1 .NET 4.5 and Windows 7 x64 .NET 4.5 platform
 
 
 == Troubleshooting
diff --git a/src/CallfireApiClient.IntegrationTests/CallfireApiClient.IntegrationTests.csproj b/src/CallfireApiClient.IntegrationTests/CallfireApiClient.IntegrationTests.csproj
index 76b4efb..e7745bb 100644
--- a/src/CallfireApiClient.IntegrationTests/CallfireApiClient.IntegrationTests.csproj
+++ b/src/CallfireApiClient.IntegrationTests/CallfireApiClient.IntegrationTests.csproj
@@ -9,7 +9,7 @@
     <AssemblyName>IntegrationTests</AssemblyName>
     <UseMSBuildEngine>True</UseMSBuildEngine>
     <ReleaseVersion>1.0.0</ReleaseVersion>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
diff --git a/src/CallfireApiClient.Tests/CallfireApiClient.Tests.csproj b/src/CallfireApiClient.Tests/CallfireApiClient.Tests.csproj
index 3b6c012..b15a08e 100644
--- a/src/CallfireApiClient.Tests/CallfireApiClient.Tests.csproj
+++ b/src/CallfireApiClient.Tests/CallfireApiClient.Tests.csproj
@@ -8,7 +8,7 @@
     <RootNamespace>CallfireApiClient.Tests</RootNamespace>
     <AssemblyName>callfire-api-client-tests</AssemblyName>
     <ReleaseVersion>1.0.0</ReleaseVersion>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
diff --git a/src/CallfireApiClient/CallfireApiClient.csproj b/src/CallfireApiClient/CallfireApiClient.csproj
index 8176e46..ba981ac 100644
--- a/src/CallfireApiClient/CallfireApiClient.csproj
+++ b/src/CallfireApiClient/CallfireApiClient.csproj
@@ -9,7 +9,7 @@
     <AssemblyName>callfire-api-client</AssemblyName>
     <ReleaseVersion>1.0.0</ReleaseVersion>
     <CodePage>65001</CodePage>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">