diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9637a73874919221d02ab2de2235c34c99ddbb14..0cecc25485609966a12dc73fdf900c366d526e18 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,9 +18,6 @@ before_script:
     - make -C ${CI_JOB_NAME}
     - '[ "$CI_COMMIT_REF_NAME" != master ] || make -C ${CI_JOB_NAME} push'
 
-'42.3':
-  <<: *build_job
-
 '15.0':
   <<: *build_job
 
diff --git a/42.3/Dockerfile b/42.3/Dockerfile
deleted file mode 100644
index 9e78f518d34d86d3e40981e88cac5b9dda716785..0000000000000000000000000000000000000000
--- a/42.3/Dockerfile
+++ /dev/null
@@ -1,36 +0,0 @@
-FROM opensuse/leap:42.3
-
-RUN zypper refresh -f \
- && zypper update -y \
- && zypper clean
-
-RUN zypper --non-interactive install --no-recommends \
-  sudo wget curl which tar expect git \
-  make patch rpm-build rpmlint \
- && zypper clean
-
-RUN zypper --non-interactive install --no-recommends \
-  cmake libopenssl-devel ccache \
- && zypper clean
-
-RUN OBS_DIST=openSUSE_Leap_42.3 \
- && zypper --non-interactive addrepo --refresh https://download.opensuse.org/repositories/home:/lazyfrosch:/devel:/languages:/go/"${OBS_DIST}"/home:lazyfrosch:devel:languages:go.repo \
- && zypper --non-interactive addrepo --refresh https://download.opensuse.org/repositories/home:/lazyfrosch:/devel:/tools/"${OBS_DIST}"/home:lazyfrosch:devel:tools.repo \
- && zypper --gpg-auto-import-keys --non-interactive install spectool createrepo \
- && zypper clean -a
-
-RUN rpm --import https://packages.icinga.com/icinga.key \
- && zypper --non-interactive addrepo --refresh https://packages.icinga.com/openSUSE/ICINGA-release.repo \
- && zypper --non-interactive refresh \
- && zypper clean -a
-
-RUN groupadd -g 1000 build \
- && useradd -u 1000 -g 1000 -m build \
- && echo 'Defaults:build !requiretty' | tee -a /etc/sudoers \
- && echo 'build ALL=(ALL:ALL) NOPASSWD: ALL' | tee -a /etc/sudoers \
- && chown build.build /usr/local/bin
-
-USER build
-RUN git clone https://git.icinga.com/build-docker/scripts.git /usr/local/bin
-ENTRYPOINT ["/usr/local/bin/icinga-build-entrypoint"]
-CMD ["icinga-build-package"]
diff --git a/42.3/Makefile b/42.3/Makefile
deleted file mode 100644
index f451fe153997996b75db9be5b1b9b967fad97fc4..0000000000000000000000000000000000000000
--- a/42.3/Makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-VARIANT := x86_64
-include ../image.mk
diff --git a/Makefile b/Makefile
index 0905417c3c30bcd2d12d53be680f69930608910e..32d27a30477f2ab25c34e128786c300b1d7abb20 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,9 @@
 all:
-	$(MAKE) -C 42.3
 	$(MAKE) -C 15.0
 	$(MAKE) -C 15.1
 	$(MAKE) -C 15.2
 
 push:
-	$(MAKE) -C 42.3 push
 	$(MAKE) -C 15.0 push
 	$(MAKE) -C 15.1 push
 	$(MAKE) -C 15.2 push