1 files changed, 8 insertions, 17 deletions
diff --git a/templates/tools/dockerfile/csharp_deps.include b/templates/tools/dockerfile/csharp_deps.include
index 7ed0074867..fdede9e840 100644
--- a/templates/tools/dockerfile/csharp_deps.include
+++ b/templates/tools/dockerfile/csharp_deps.include
@@ -1,24 +1,15 @@
 #================
 # C# dependencies
 
-# Update to a newer version of mono
-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
-
-# Install dependencies
-RUN apt-get update && apt-get -y dist-upgrade && apt-get install -y ${'\\'}
+# cmake >=3.6 needed to build grpc_csharp_ext
+RUN apt-get update && apt-get install -y cmake && apt-get clean
+
+# Install mono
+RUN apt-get update && apt-get install -y apt-transport-https dirmngr && apt-get clean
+RUN apt-key adv --no-tty --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+RUN echo "deb https://download.mono-project.com/repo/debian stable-stretch main" | tee /etc/apt/sources.list.d/mono-official-stable.list
+RUN apt-get update && apt-get install -y ${'\\'}
     mono-devel ${'\\'}
     ca-certificates-mono ${'\\'}
     nuget ${'\\'}
     && apt-get clean
-
-RUN nuget update -self
-
-#=================
-# Use cmake 3.6 from jessie-backports
-# needed to build grpc_csharp_ext with cmake
-
-RUN echo "deb http://ftp.debian.org/debian jessie-backports main" | tee /etc/apt/sources.list.d/jessie-backports.list
-RUN apt-get update && apt-get install -t jessie-backports -y cmake && apt-get clean