diff --git a/ci/Dockerfile b/ci/Dockerfile
index a13dfb1..173ca06 100644
--- a/ci/Dockerfile
+++ b/ci/Dockerfile
@@ -16,7 +16,7 @@ RUN echo '#!/bin/sh' > /usr/sbin/policy-rc.d
 RUN echo 'exit 101' >> /usr/sbin/policy-rc.d
 RUN chmod +x /usr/sbin/policy-rc.d
 
-RUN echo deb-src http://deb.debian.org/debian unstable main >> /etc/apt/sources.list
+RUN echo deb-src http://deb.debian.org/debian testing main >> /etc/apt/sources.list
 RUN apt-get update && \
     apt-get -y install ca-certificates && \
     apt-get -y install --no-install-recommends \