diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e3e9dcdb..c4e363a4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -41,12 +41,9 @@ before_script:
       $CI_REGISTRY_IMAGE/builder/$DISTRO-$COMPILER:$CI_COMMIT_SHA
     - docker push $CI_REGISTRY_IMAGE/builder/$DISTRO-$COMPILER:$CI_COMMIT_SHA
 
-pull ubuntu clang-8: *pull_images
 pull ubuntu clang-9: *pull_images
 pull ubuntu clang-10: *pull_images
 pull ubuntu clang-11: *pull_images
-pull ubuntu gcc-5: *pull_images
-pull ubuntu gcc-6: *pull_images
 pull ubuntu gcc-7: *pull_images
 pull ubuntu gcc-8: *pull_images
 pull ubuntu gcc-9: *pull_images
@@ -158,12 +155,9 @@ builder centos7 base:
       docker push
       ${CI_REGISTRY_IMAGE}/builder/$DISTRO-$COMPILER:$CI_COMMIT_REF_SLUG
 
-builder ubuntu clang-8: *docker_builder
 builder ubuntu clang-9: *docker_builder
 builder ubuntu clang-10: *docker_builder
 builder ubuntu clang-11: *docker_builder
-builder ubuntu gcc-5: *docker_builder
-builder ubuntu gcc-6: *docker_builder
 builder ubuntu gcc-7: *docker_builder
 builder ubuntu gcc-8: *docker_builder
 builder ubuntu gcc-9: *docker_builder
@@ -224,15 +218,6 @@ builder centos7 clang-5: *docker_builder
   BUILD_LUA_CAIRO: "ON"
   BUILD_LUA_RSVG: "ON"
 
-ubuntu clang-8:
-  <<: *build_stages
-  variables:
-    <<: *build_variables
-    DISTRO: ubuntu
-    COMPILER: clang-8
-    CC: clang-8
-    CXX: clang++-8
-
 ubuntu clang-9:
   <<: *build_stages
   variables:
@@ -260,24 +245,6 @@ ubuntu clang-11:
     CC: clang-11
     CXX: clang++-11
 
-ubuntu gcc-5:
-  <<: *build_stages
-  variables:
-    <<: *build_variables
-    DISTRO: ubuntu
-    COMPILER: gcc-5
-    CC: gcc-5
-    CXX: g++-5
-
-ubuntu gcc-6:
-  <<: *build_stages
-  variables:
-    <<: *build_variables
-    DISTRO: ubuntu
-    COMPILER: gcc-6
-    CC: gcc-6
-    CXX: g++-6
-
 ubuntu gcc-7:
   <<: *build_stages
   variables:
@@ -575,15 +542,6 @@ centos7 clang-5:
     paths:
       - build/test-conky-coverage-html/
 
-test ubuntu clang-8:
-  <<: *test_stages
-  <<: *test_run
-  variables:
-    DISTRO: ubuntu
-    COMPILER: clang-8
-    CC: clang-8
-    CXX: clang++-8
-
 test ubuntu clang-9:
   <<: *test_stages
   <<: *test_run
@@ -611,24 +569,6 @@ test ubuntu clang-11:
     CC: clang-11
     CXX: clang++-11
 
-test ubuntu gcc-5:
-  <<: *test_stages
-  <<: *test_run
-  variables:
-    DISTRO: ubuntu
-    COMPILER: gcc-5
-    CC: gcc-5
-    CXX: g++-5
-
-test ubuntu gcc-6:
-  <<: *test_stages
-  <<: *test_run
-  variables:
-    DISTRO: ubuntu
-    COMPILER: gcc-6
-    CC: gcc-6
-    CXX: g++-6
-
 test ubuntu gcc-7:
   <<: *test_stages
   <<: *test_run
@@ -872,12 +812,9 @@ push fedora-33 base: *push_base_images
       $CI_REGISTRY_IMAGE/builder/$DISTRO-$COMPILER:latest
     - docker push $CI_REGISTRY_IMAGE/builder/$DISTRO-$COMPILER:latest
 
-push ubuntu clang-8: *push_images
 push ubuntu clang-9: *push_images
 push ubuntu clang-10: *push_images
 push ubuntu clang-11: *push_images
-push ubuntu gcc-5: *push_images
-push ubuntu gcc-6: *push_images
 push ubuntu gcc-7: *push_images
 push ubuntu gcc-8: *push_images
 push ubuntu gcc-9: *push_images
diff --git a/tests/dockerfiles/Dockerfile.ubuntu-clang-8 b/tests/dockerfiles/Dockerfile.ubuntu-clang-8
deleted file mode 100644
index ce7781f4..00000000
--- a/tests/dockerfiles/Dockerfile.ubuntu-clang-8
+++ /dev/null
@@ -1,18 +0,0 @@
-ARG IMAGE=registry.gitlab.com/brndnmtthws-oss/conky
-FROM ${IMAGE}/builder/ubuntu-base:latest
-
-RUN wget -q https://apt.llvm.org/llvm-snapshot.gpg.key \
-  && apt-key add llvm-snapshot.gpg.key \
-  && add-apt-repository 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-8 main' \
-  && DEBIAN_FRONTEND=noninteractive \
-  apt-get install -qy --no-install-recommends \
-  clang-8 \
-  lldb-8 \
-  lld-8 \
-  libc++-8-dev \
-  libc++abi-8-dev \
-  clang-tools-8 \
-  clang-format-8 \
-  clang-tidy-8 \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
diff --git a/tests/dockerfiles/Dockerfile.ubuntu-gcc-5 b/tests/dockerfiles/Dockerfile.ubuntu-gcc-5
deleted file mode 100644
index 81931e49..00000000
--- a/tests/dockerfiles/Dockerfile.ubuntu-gcc-5
+++ /dev/null
@@ -1,11 +0,0 @@
-ARG IMAGE=registry.gitlab.com/brndnmtthws-oss/conky
-FROM ${IMAGE}/builder/ubuntu-base:latest
-
-RUN wget -q https://apt.llvm.org/llvm-snapshot.gpg.key \
-  && apt-key add llvm-snapshot.gpg.key \
-  && add-apt-repository ppa:ubuntu-toolchain-r/test \
-  && DEBIAN_FRONTEND=noninteractive \
-  apt-get install -qy --no-install-recommends \
-  g++-5 \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
diff --git a/tests/dockerfiles/Dockerfile.ubuntu-gcc-6 b/tests/dockerfiles/Dockerfile.ubuntu-gcc-6
deleted file mode 100644
index 1b6a6074..00000000
--- a/tests/dockerfiles/Dockerfile.ubuntu-gcc-6
+++ /dev/null
@@ -1,11 +0,0 @@
-ARG IMAGE=registry.gitlab.com/brndnmtthws-oss/conky
-FROM ${IMAGE}/builder/ubuntu-base:latest
-
-RUN wget -q https://apt.llvm.org/llvm-snapshot.gpg.key \
-  && apt-key add llvm-snapshot.gpg.key \
-  && add-apt-repository ppa:ubuntu-toolchain-r/test \
-  && DEBIAN_FRONTEND=noninteractive \
-  apt-get install -qy --no-install-recommends \
-  g++-6 \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*