diff --git a/src/ImageProcessor.UnitTests/ImageProcessor.UnitTests.csproj b/src/ImageProcessor.UnitTests/ImageProcessor.UnitTests.csproj
index f7a94845a..b01589d57 100644
--- a/src/ImageProcessor.UnitTests/ImageProcessor.UnitTests.csproj
+++ b/src/ImageProcessor.UnitTests/ImageProcessor.UnitTests.csproj
@@ -37,11 +37,13 @@
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="FluentAssertions">
-      <HintPath>..\packages\FluentAssertions.3.2.1\lib\net45\FluentAssertions.dll</HintPath>
+    <Reference Include="FluentAssertions, Version=3.3.0.0, Culture=neutral, PublicKeyToken=33f2691a05b67b6a, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\FluentAssertions.3.3.0\lib\net45\FluentAssertions.dll</HintPath>
     </Reference>
-    <Reference Include="FluentAssertions.Core">
-      <HintPath>..\packages\FluentAssertions.3.2.1\lib\net45\FluentAssertions.Core.dll</HintPath>
+    <Reference Include="FluentAssertions.Core, Version=3.3.0.0, Culture=neutral, PublicKeyToken=33f2691a05b67b6a, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\FluentAssertions.3.3.0\lib\net45\FluentAssertions.Core.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Drawing" />
diff --git a/src/ImageProcessor.UnitTests/Imaging/Helpers/ImageMathsUnitTests.cs b/src/ImageProcessor.UnitTests/Imaging/Helpers/ImageMathsUnitTests.cs
index f8d56fd54..aa20d9b51 100644
--- a/src/ImageProcessor.UnitTests/Imaging/Helpers/ImageMathsUnitTests.cs
+++ b/src/ImageProcessor.UnitTests/Imaging/Helpers/ImageMathsUnitTests.cs
@@ -45,7 +45,7 @@
         [TestCase(200, 100, 45, 2.12f)]
         [TestCase(600, 450, 20, 1.39f)]
         [TestCase(600, 450, 45, 1.64f)]
-        [TestCase(100, 200, -45, 1.22f)]
+        [TestCase(100, 200, -45, 2.12f)]
         public void RotationZoomIsCalculated(int imageWidth, int imageHeight, float angle, float expected)
         {
             float result = ImageMaths.ZoomAfterRotation(imageWidth, imageHeight, angle);
diff --git a/src/ImageProcessor.UnitTests/packages.config b/src/ImageProcessor.UnitTests/packages.config
index 266c399ff..29c465218 100644
--- a/src/ImageProcessor.UnitTests/packages.config
+++ b/src/ImageProcessor.UnitTests/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="FluentAssertions" version="3.2.1" targetFramework="net45" />
+  <package id="FluentAssertions" version="3.3.0" targetFramework="net45" />
   <package id="NUnit" version="2.6.3" targetFramework="net451" />
 </packages>
\ No newline at end of file