diff --git a/templates/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile.template b/templates/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile.template
index 35782d6665fd0f7f2103cbfcfe4c73d106f8454f..9bf7794247b946ffe84512e19015e79f25671dbf 100644
--- a/templates/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile.template
+++ b/templates/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile.template
@@ -29,7 +29,7 @@
   # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   
-  FROM microsoft/dotnet:1.0.0-preview1
+  FROM microsoft/dotnet:1.0.0-preview2-sdk
   
   <%include file="../../apt_get_basic.include"/>
   <%include file="../../run_tests_addons.include"/>
diff --git a/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile b/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile
index 9dfc040d7361e04cc04e35856db04e46889ace08..d499a708b071e38c162f60a962f37a00332734fa 100644
--- a/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile
+++ b/tools/dockerfile/test/csharp_coreclr_x64/Dockerfile
@@ -27,7 +27,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-FROM microsoft/dotnet:1.0.0-preview1
+FROM microsoft/dotnet:1.0.0-preview2-sdk
 
 # Install Git and basic packages.
 RUN apt-get update && apt-get install -y \