diff --git a/TESTGUIDE.md b/TESTGUIDE.md
index 844c470489..e869e561e9 100644
--- a/TESTGUIDE.md
+++ b/TESTGUIDE.md
@@ -22,9 +22,8 @@ The test cases for this suite reside next to the Visual F# Tools code, at `vsint
 In order to run all of the tests, you will need to install
 
 * [Perl](http://www.perl.org/get.html) (ActiveState Perl 5.16.3 is known to work fine)
-* [NUnit](http://nunit.org/?p=download) (2.6.3 is known to work fine)
 
-Perl and NUnit must be included in the `%PATH%` for the below steps to work.  It is also recommended that you run tests from an elevated command prompt, as there are a couple of test cases which modify the GAC, and this requires administrative privileges.
+Perl must be included in the `%PATH%` for the below steps to work.  It is also recommended that you run tests from an elevated command prompt, as there are a couple of test cases which modify the GAC, and this requires administrative privileges.
 
 Before running tests, make sure you have successfully built all required projects as specified in the 'Prepare For Tests' section of the [DEVGUIDE](DEVGUIDE.md).
 
diff --git a/packages.config b/packages.config
index f3c92a29a4..a7462f8425 100644
--- a/packages.config
+++ b/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="NUnit" version="2.6.3" targetFramework="net40" />
-  <package id="NUnit.Runners" version="2.6.3" />
+  <package id="NUnit" version="2.6.4" targetFramework="net40" />
+  <package id="NUnit.Runners" version="2.6.4" />
 </packages>
\ No newline at end of file
diff --git a/src/FSharpSource.targets b/src/FSharpSource.targets
index 884080b828..27b47b1c00 100644
--- a/src/FSharpSource.targets
+++ b/src/FSharpSource.targets
@@ -98,8 +98,8 @@
   </PropertyGroup>  
   
   <PropertyGroup>
-    <NUnitVersion>2.6.3</NUnitVersion>
-    <NUnitFullVersion>2.6.3.13283</NUnitFullVersion>
+    <NUnitVersion>2.6.4</NUnitVersion>
+    <NUnitFullVersion>2.6.4.14350</NUnitFullVersion>
     <NUnitLibDir>$(FSharpSourcesRoot)\..\packages\NUnit.$(NUnitVersion)\lib\</NUnitLibDir>
     <NunitToolsLibDir>$(FSharpSourcesRoot)\..\packages\NUnit.Runners.$(NUnitVersion)\tools\lib\</NunitToolsLibDir>
   </PropertyGroup>
diff --git a/tests/RunTests.cmd b/tests/RunTests.cmd
index 1ea4eb6568..b5b7f23c49 100644
--- a/tests/RunTests.cmd
+++ b/tests/RunTests.cmd
@@ -10,7 +10,7 @@ goto :USAGE
 
 :flavor_ok
 
-set NUNITPATH=%~dp0%..\packages\NUnit.Runners.2.6.3\tools\
+set NUNITPATH=%~dp0%..\packages\NUnit.Runners.2.6.4\tools\
 if not exist "%NUNITPATH%" (
     pushd %~dp0..
     .\.nuget\nuget.exe restore packages.config -PackagesDirectory packages