diff --git a/image/Dockerfile b/image/Dockerfile
index d6ca089..6b41c60 100644
--- a/image/Dockerfile
+++ b/image/Dockerfile
@@ -44,10 +44,6 @@ RUN apt-get update && apt-get -y install \
     libeigen3-dev    \
     libboost-dev
 
-# Activate backports for more recent version of CMake
-RUN echo "deb http://deb.debian.org/debian buster-backports main" > /etc/apt/sources.list.d/backports.list && apt-get update
-RUN apt-get -t buster-backports -y install cmake                   # from https://packages.debian.org/buster-backports/cmake
-
 # Make symlinks to avoid adding /usr/include to include dirs.
 RUN mkdir -p /project/dependencies/include && mkdir -p /project/dependencies/lib && \
     ln -s /usr/include/boost   /project/dependencies/include/boost  && \