diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 08521a83..1fd8d3b2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -57,7 +57,6 @@ pull fedora-29 clang-7: *pull_images
 pull fedora-31 clang-8: *pull_images
 pull fedora-32 clang-10: *pull_images
 pull fedora-33 clang-11: *pull_images
-pull centos6 gcc-7: *pull_images
 pull centos7 gcc-7: *pull_images
 pull centos7 gcc-8: *pull_images
 pull centos7 clang-5: *pull_images
@@ -128,11 +127,6 @@ builder fedora-33 base:
   variables:
     DOCKER_BASE_IMAGE: fedora:33
 
-builder centos6 base:
-  <<: *docker_base_builder
-  variables:
-    DOCKER_BASE_IMAGE: centos:6
-
 builder centos7 base:
   <<: *docker_base_builder
   variables:
@@ -181,7 +175,6 @@ builder fedora-29 clang-7: *docker_builder
 builder fedora-31 clang-8: *docker_builder
 builder fedora-32 clang-10: *docker_builder
 builder fedora-33 clang-11: *docker_builder
-builder centos6 gcc-7: *docker_builder
 builder centos7 gcc-7: *docker_builder
 builder centos7 gcc-8: *docker_builder
 builder centos7 clang-5: *docker_builder
@@ -382,27 +375,6 @@ fedora-33 clang-11:
     CXX: clang++
     BUILD_AUDACIOUS: "OFF"
 
-centos6 gcc-7:
-  <<: *build_stages
-  variables:
-    <<: *build_variables
-    DISTRO: centos6
-    COMPILER: gcc-7
-    CC: gcc
-    CXX: g++
-    CMAKE: cmake3
-    BUILD_AUDACIOUS: "OFF"
-    BUILD_XMMS2: "OFF"
-    BUILD_NVIDIA: "OFF"
-    BUILD_JOURNAL: "OFF"
-    BUILD_LUA_CAIRO: "OFF"
-    BUILD_LUA_RSVG: "OFF"
-    # required because centos6 separates tinfo from ncurses
-    LINKER_FLAGS: "-ltinfo"
-  before_script:
-    - source /opt/rh/devtoolset-7/enable
-    - echo $GCS_STORAGE_KEY > $SCCACHE_GCS_KEY_PATH
-
 centos7 gcc-7:
   <<: *build_stages
   variables:
@@ -758,18 +730,6 @@ test fedora-33 clang-11:
     CC: clang
     CXX: clang++
 
-test centos6 gcc-7:
-  <<: *test_stages
-  <<: *test_run
-  variables:
-    DISTRO: centos7
-    COMPILER: gcc-7
-    CC: gcc
-    CXX: g++
-  before_script:
-    - source /opt/rh/devtoolset-7/enable
-    - echo $GCS_STORAGE_KEY > $SCCACHE_GCS_KEY_PATH
-
 test centos7 clang-5:
   <<: *test_stages
   <<: *test_run
@@ -907,7 +867,6 @@ check clang-format:
     - docker push $CI_REGISTRY_IMAGE/builder/$DISTRO-base:latest
 
 push ubuntu base: *push_base_images
-push centos6 base: *push_base_images
 push centos7 base: *push_base_images
 push fedora-29 base: *push_base_images
 push fedora-31 base: *push_base_images
@@ -949,7 +908,6 @@ push fedora-29 clang-7: *push_images
 push fedora-31 clang-8: *push_images
 push fedora-32 clang-10: *push_images
 push fedora-33 clang-11: *push_images
-push centos6 gcc-7: *push_images
 push centos7 gcc-7: *push_images
 push centos7 gcc-8: *push_images
 push centos7 clang-5: *push_images
diff --git a/tests/dockerfiles/Dockerfile.centos6-base b/tests/dockerfiles/Dockerfile.centos6-base
deleted file mode 100644
index 29518af3..00000000
--- a/tests/dockerfiles/Dockerfile.centos6-base
+++ /dev/null
@@ -1,69 +0,0 @@
-FROM centos:6
-
-ENV SCCACHE_VER=0.2.8
-
-RUN yum update -y -q \
-    && yum -y -q install \
-    epel-release \
-    centos-release-scl \
-    && yum -y -q install \
-    cairo-devel \
-    dbus-glib-devel \
-    docbook2X \
-    freetype-devel \
-    gcc \
-    git \
-    imlib2-devel \
-    lcov \
-    libcurl-devel \
-    libical-devel \
-    libircclient-devel \
-    libmicrohttpd-devel \
-    librsvg2-devel \
-    libX11-devel \
-    libXdamage-devel \
-    libXext-devel \
-    libXft-devel \
-    libXinerama-devel \
-    libxml2-devel \
-    make \
-    man \
-    mysql-devel \
-    ncurses-devel \
-    openssl-devel \
-    patch \
-    pulseaudio-libs-devel \
-    readline-devel \
-    && curl -sL https://github.com/mozilla/sccache/releases/download/${SCCACHE_VER}/sccache-${SCCACHE_VER}-x86_64-unknown-linux-musl.tar.gz -o sccache-${SCCACHE_VER}-x86_64-unknown-linux-musl.tar.gz \
-    && tar xf sccache-${SCCACHE_VER}-x86_64-unknown-linux-musl.tar.gz \
-    && cp sccache-${SCCACHE_VER}-x86_64-unknown-linux-musl/sccache /usr/bin \
-    && rm -rf sccache-${SCCACHE_VER}-x86_64-unknown-linux-musl* \
-    && curl -L https://github.com/Kitware/CMake/releases/download/v3.13.4/cmake-3.13.4-Linux-x86_64.sh -o cmake-3.13.4-Linux-x86_64.sh \
-    && chmod +x cmake-3.13.4-Linux-x86_64.sh \
-    && ./cmake-3.13.4-Linux-x86_64.sh --prefix=/usr --skip-license \
-    && rm cmake-3.13.4-Linux-x86_64.sh \
-    && mkdir /luabuild \
-    && pushd /luabuild \
-    && curl -R -O http://www.lua.org/ftp/lua-5.3.5.tar.gz \
-    && tar zxf lua-5.3.5.tar.gz \
-    && cd lua-5.3.5 \
-    && make -j4 linux MYCFLAGS=-fPIC MYLDFLAGS=-fPIC \
-    && make install INSTALL_TOP=/usr \
-    && popd \
-    && rm -rf /luabuild \
-    && mkdir -p /usr/lib/pkgconfig \
-    && echo $'\
-V= 5.3\n\
-R= 5.3.5\n\
-prefix= /usr\n\
-exec_prefix=${prefix}\n\
-libdir= /usr/lib\n\
-includedir=${prefix}/include\n\
-\n\
-Name: Lua\n\
-Description: An Extensible Extension Language\n\
-Version: ${R}\n\
-Requires:\n\
-Libs: -llua -lm -ldl\n\
-Cflags: -I${includedir}' \
->> /usr/lib64/pkgconfig/lua.pc
diff --git a/tests/dockerfiles/Dockerfile.centos6-gcc-7 b/tests/dockerfiles/Dockerfile.centos6-gcc-7
deleted file mode 100644
index 8aa28a77..00000000
--- a/tests/dockerfiles/Dockerfile.centos6-gcc-7
+++ /dev/null
@@ -1,6 +0,0 @@
-ARG IMAGE=registry.gitlab.com/brndnmtthws-oss/conky
-FROM ${IMAGE}/builder/centos6-base:latest
-
-RUN yum -y -q install \
-    devtoolset-7 \
-    && yum clean all