diff --git a/tools/dockerfile/interoptest/grpc_interop_ruby/Dockerfile b/tools/dockerfile/interoptest/grpc_interop_ruby/Dockerfile
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index 88b5130..7ae9f7d 100644
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--- a/tools/dockerfile/interoptest/grpc_interop_ruby/Dockerfile
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+++ b/tools/dockerfile/interoptest/grpc_interop_ruby/Dockerfile
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@@ -70,12 +70,12 @@ RUN apt-get update && apt-get install -y time && apt-get clean
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RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
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RUN \curl -sSL https://get.rvm.io | bash -s stable
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-# Install Ruby 2.1
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-RUN /bin/bash -l -c "rvm install ruby-2.1"
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-RUN /bin/bash -l -c "rvm use --default ruby-2.1"
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+# Install Ruby 2.1.8
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+RUN /bin/bash -l -c "rvm install ruby-2.1.8"
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+RUN /bin/bash -l -c "rvm use --default ruby-2.1.8"
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RUN /bin/bash -l -c "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"
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RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
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-RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.1' >> ~/.bashrc"
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+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.1.8' >> ~/.bashrc"
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RUN /bin/bash -l -c "gem install bundler --no-ri --no-rdoc"
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# Prepare ccache
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diff --git a/tools/dockerfile/interoptest/grpc_interop_ruby/build_interop.sh b/tools/dockerfile/interoptest/grpc_interop_ruby/build_interop.sh
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index 97b3860..cec046d 100755
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--- a/tools/dockerfile/interoptest/grpc_interop_ruby/build_interop.sh
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+++ b/tools/dockerfile/interoptest/grpc_interop_ruby/build_interop.sh
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@@ -38,7 +38,7 @@ git clone --recursive /var/local/jenkins/grpc /var/local/git/grpc
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cp -r /var/local/jenkins/service_account $HOME || true
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cd /var/local/git/grpc
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-rvm --default use ruby-2.1
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+rvm --default use ruby-2.1.8
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# build Ruby interop client and server
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(cd src/ruby && gem update bundler && bundle && rake compile)
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