  # Install dependencies
  RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y \
 diff --git a/tools/dockerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile b/tools/dockerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile
-index 65f67d36502..33a2e54bc1e 100644
+index 65f67d3650..26223753ed 100644
 --- a/tools/dockerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile
 +++ b/tools/dockerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile
 @@ -82,11 +82,10 @@ RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.0.0a2

-RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
-RUN echo "deb http://download.mono-project.com/repo/debian wheezy main" | tee /etc/apt/sources.list.d/mono-xamarin.list
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+RUN echo "deb http://download.mono-project.com/repo/debian jessie main" | tee /etc/apt/sources.list.d/mono-official.list
 RUN echo "deb http://download.mono-project.com/repo/debian wheezy-apache24-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list
 RUN echo "deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list
-RUN echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list

 
 # Install dependencies
 RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y \
@@ -99,7 +98,8 @@ RUN nuget update -self
 
 # Install dotnet SDK based on https://www.microsoft.com/net/core#debian
 RUN apt-get update && apt-get install -y curl libunwind8 gettext
-RUN curl -sSL -o dotnet.tar.gz https://go.microsoft.com/fwlink/?LinkID=809130
+# https://github.com/dotnet/core/blob/master/release-notes/download-archives/1.0.1-preview2-download.md
+RUN curl -sSL -o dotnet.tar.gz https://go.microsoft.com/fwlink/?LinkID=827530
 RUN mkdir -p /opt/dotnet && tar zxf dotnet.tar.gz -C /opt/dotnet
 RUN ln -s /opt/dotnet/dotnet /usr/local/bin
 
