diff --git a/.travis.yml b/.travis.yml
index 7ee0a45..45c003b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,5 +14,6 @@ env:
   - DOCKER_TAG=latest
   - DOCKER_TAG=sle12-sp3
   - DOCKER_TAG=sle12-sp4
+  - DOCKER_TAG=sle12-sp5
   - DOCKER_TAG=sle15
 
diff --git a/Dockerfile.latest b/Dockerfile.latest
index 07f4d79..9696b8f 100644
--- a/Dockerfile.latest
+++ b/Dockerfile.latest
@@ -33,7 +33,7 @@ RUN zypper ar -f -p 50 http://download.opensuse.org/repositories/devel:/librarie
 RUN rpm --import https://build.opensuse.org/projects/devel:libraries:libyui/public_key
 
 RUN RUBY_VERSION=ruby:`rpm --eval '%{rb_ver}'` && \
-  zypper --gpg-auto-import-keys --non-interactive in --no-recommends \
+  zypper --non-interactive in --no-recommends \
   boost-devel \
   brp-check-suse \
   brp-extract-appdata \
diff --git a/Dockerfile.sle12-sp3 b/Dockerfile.sle12-sp3
index 8c1a45f..cab9f44 100644
--- a/Dockerfile.sle12-sp3
+++ b/Dockerfile.sle12-sp3
@@ -2,7 +2,7 @@
 # because of some licensing issues, use openSUSE-42.3 as a replacement.
 # It shares the same core packages and should be close enough to SLE12-SP3
 # for running the libyui builds.
-FROM opensuse:42.3
+FROM opensuse/leap:42.3
 
 # ensure the UTF-8 locales are set
 ENV LC_ALL=en_US.UTF-8
@@ -33,7 +33,7 @@ RUN zypper ar -f -p 95 http://download.opensuse.org/repositories/YaST:/SLE-12:/S
 RUN rpm --import https://build.opensuse.org/projects/YaST:SLE-12:SP3/public_key
 
 RUN RUBY_VERSION=`rpm --eval '%{rb_default_ruby_abi}'` && \
-  zypper --gpg-auto-import-keys --non-interactive in --no-recommends \
+  zypper --non-interactive in --no-recommends \
   boost-devel \
   cmake \
   doxygen \
diff --git a/Dockerfile.sle12-sp4 b/Dockerfile.sle12-sp4
index 984804a..a23ffdf 100644
--- a/Dockerfile.sle12-sp4
+++ b/Dockerfile.sle12-sp4
@@ -3,7 +3,7 @@
 # as there is no openSUSE-42.4 release which would be the equivalent to SLES12-SP4.
 # It shares the same core packages and should be close enough to SLE12-SP4
 # for running the libyui builds.
-FROM opensuse:42.3
+FROM opensuse/leap:42.3
 
 # ensure the UTF-8 locales are set
 ENV LC_ALL=en_US.UTF-8
@@ -34,7 +34,7 @@ RUN zypper ar -f -p 95 https://download.opensuse.org/repositories/YaST:/SLE-12:/
 RUN rpm --import https://build.opensuse.org/projects/YaST/public_key
 
 RUN RUBY_VERSION=`rpm --eval '%{rb_default_ruby_abi}'` && \
-  zypper --gpg-auto-import-keys --non-interactive in --no-recommends \
+  zypper --non-interactive in --no-recommends \
   boost-devel \
   cmake \
   doxygen \
diff --git a/Dockerfile.sle12-sp5 b/Dockerfile.sle12-sp5
new file mode 100644
index 0000000..1ef256f
--- /dev/null
+++ b/Dockerfile.sle12-sp5
@@ -0,0 +1,76 @@
+# SLE12-SP5 is officially not available at the Docker Hub
+# because of some licensing issues, use openSUSE-42.3 as a replacement
+# as there is no openSUSE-42.5 release which would be the equivalent to SLES12-SP5.
+# It shares the same core packages and should be close enough to SLE12-SP5
+# for running the libyui builds.
+FROM opensuse/leap:42.3
+
+# ensure the UTF-8 locales are set
+ENV LC_ALL=en_US.UTF-8
+
+# do not install the files marked as documentation (use "rpm --excludedocs")
+RUN sed -i -e "s/^.*rpm.install.excludedocs.*/rpm.install.excludedocs = yes/" /etc/zypp/zypp.conf
+
+# the NON-OSS repo is not needed, save the network bandwidth and some time (~5 seconds) for each refresh
+RUN zypper mr -d "NON OSS"
+
+# we need to install Ruby first to define the %{rb_default_ruby_abi} RPM macro
+# see https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#run
+# https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#/build-cache
+# why we need "zypper clean -a" at the end
+# "curl" is needed for importing the GPG key by "rpm" command
+RUN zypper --non-interactive in --no-recommends \
+  curl ruby && zypper clean -a
+
+# Reuse the YaST SP5 repository, we do not want to maintain extra devel:libraries:libyui:SLE-12:SP5
+# subproject.
+#
+# Set a higher priority for the sle_12_sp5 repo to prefer the packages from
+# this repo even if they have a lower version than the original 42.3 packages.
+RUN zypper ar -f -p 95 https://download.opensuse.org/repositories/YaST:/SLE-12:/SP5/openSUSE_Leap_42.3/ \
+  sle12_sp5
+
+# import the YaST OBS GPG key
+RUN rpm --import https://build.opensuse.org/projects/YaST/public_key
+
+RUN RUBY_VERSION=`rpm --eval '%{rb_default_ruby_abi}'` && \
+  zypper --non-interactive in --no-recommends \
+  boost-devel \
+  cmake \
+  doxygen \
+  fontconfig-devel \
+  gcc-c++ \
+  git \
+  gtk3-devel \
+  libyui-devel \
+  libyui-ncurses-devel \
+  libyui-qt-devel \
+  libzypp-devel \
+  obs-service-source_validator \
+  pkg-config \
+  'pkgconfig(Qt5Core)' \
+  'pkgconfig(Qt5Gui)' \
+  'pkgconfig(Qt5Svg)' \
+  'pkgconfig(Qt5Widgets)' \
+  'pkgconfig(Qt5X11Extras)' \
+  "rubygem($RUBY_VERSION:libyui-rake)" \
+  "rubygem($RUBY_VERSION:rubocop)" \
+  rpm-build \
+  yast2-devtools \
+  which \
+  && zypper clean -a \
+  && rm -rf /usr/lib*/ruby/gems/*/cache \
+  && rm -rf /usr/share/doc/
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY libyui-travis /usr/local/bin
+
+# run some smoke tests to make sure there is no serious issue with the image
+RUN c++ --version
+
+# this is a bit tricky as the libyui/rake loads some files at the initialization
+RUN mkdir -p package && echo > package/test.spec && \
+  echo -e 'SET(VERSION_MAJOR "42")\nSET(VERSION_MINOR "42")\nSET(VERSION_PATCH "42")' \
+  > VERSION.cmake && rake -t -r libyui/rake -V && rm -rf package && rm VERSION.cmake
diff --git a/Dockerfile.sle15 b/Dockerfile.sle15
index b921d60..ce82d81 100644
--- a/Dockerfile.sle15
+++ b/Dockerfile.sle15
@@ -36,7 +36,7 @@ RUN zypper ar -f -p 50 http://download.opensuse.org/repositories/devel:/librarie
 RUN rpm --import https://build.opensuse.org/projects/devel:libraries:libyui/public_key
 
 RUN RUBY_VERSION=ruby:`rpm --eval '%{rb_ver}'` && \
-  zypper --gpg-auto-import-keys --non-interactive in --no-recommends \
+  zypper --non-interactive in --no-recommends \
   boost-devel \
   cmake \
   doxygen \