diff --git a/.gitlab-ci.d/code-quality.yaml b/.gitlab-ci.d/code-quality.yaml
index 73a000acd..9f1fd4faa 100644
--- a/.gitlab-ci.d/code-quality.yaml
+++ b/.gitlab-ci.d/code-quality.yaml
@@ -1,63 +1,63 @@
 .code_quality_common:
   stage: code_quality
   allow_failure: true
   rules:
     - if: "$CODE_QUALITY_DISABLED"
       when: never
     - if: "$CI_COMMIT_TAG || $CI_COMMIT_BRANCH"
 
 .code_quality_gitlab_template:
   extends:
     - .code_quality_common
-  image: docker:19.03.12
+  image: docker:20.10.21
   allow_failure: true
   services:
-    - docker:19.03.12-dind
+    - docker:20.10.21-dind
   variables:
     DOCKER_DRIVER: overlay2
     DOCKER_TLS_CERTDIR: ""
     CODE_QUALITY_IMAGE: "registry.gitlab.com/gitlab-org/ci-cd/codequality:0.85.24"
   needs: []
   script:
     - export SOURCE_CODE=$PWD
     - |
       if ! docker info &>/dev/null; then
         if [ -z "$DOCKER_HOST" -a "$KUBERNETES_PORT" ]; then
           export DOCKER_HOST='tcp://localhost:2375'
         fi
       fi
     - | # this is required to avoid undesirable reset of Docker image ENV variables being set on build stage
       function propagate_env_vars() {
         CURRENT_ENV=$(printenv)
 
         for VAR_NAME; do
           echo $CURRENT_ENV | grep "${VAR_NAME}=" > /dev/null && echo "--env $VAR_NAME "
         done
       }
     - docker pull --quiet "$CODE_QUALITY_IMAGE"
     - |
       docker run --rm \
         $(propagate_env_vars \
           SOURCE_CODE \
           TIMEOUT_SECONDS \
           CODECLIMATE_DEBUG \
           CODECLIMATE_DEV \
           REPORT_STDOUT \
           REPORT_FORMAT \
           ENGINE_MEMORY_LIMIT_BYTES \
           CODECLIMATE_PREFIX \
         ) \
         --volume "$PWD":/code \
         --volume /var/run/docker.sock:/var/run/docker.sock \
         "$CODE_QUALITY_IMAGE" /code
 
 .clang_tools:
   extends:
     - .code_quality_common
     - .debian_bullseye_clang
   before_script:
     - if [ 'x${CI_MERGE_REQUEST_ID}' != 'x' ]; then
     - git fetch origin $CI_MERGE_REQUEST_TARGET_BRANCH_NAME
     - git diff --name-only $CI_COMMIT_SHA $CI_MERGE_REQUEST_TARGET_BRANCH_NAME > file_list
     - FILE_LIST_ARG='-f file_list'
     - fi
diff --git a/.gitlab-ci.d/images.yaml b/.gitlab-ci.d/images.yaml
index 5970b3fce..716e7253d 100644
--- a/.gitlab-ci.d/images.yaml
+++ b/.gitlab-ci.d/images.yaml
@@ -1,109 +1,109 @@
 .docker_build:
-  image: "docker:19.03.11"
+  image: "docker:20.10.21"
   stage: .pre
   services:
-    - docker:19.03.11-dind
+    - docker:20.10.21-dind
   variables:
     # Use TLS https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#tls-enabled
     DOCKER_HOST: tcp://docker:2376
     DOCKER_TLS_CERTDIR: "/certs"
   before_script:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
   script:
     - cd test/ci/${IMAGE_NAME}/
     - docker build --no-cache -t registry.gitlab.com/akantu/akantu/${IMAGE_NAME} .
     - docker push registry.gitlab.com/akantu/akantu/${IMAGE_NAME}
   rules:
     - changes:
         - test/ci/${IMAGE_NAME}/*
 
 # ------------------------------------------------------------------------------
 .cache_build:
   variables:
     CCACHE_BASEDIR: ${CI_PROJECT_DIR}/
     CCACHE_DIR: ${CI_PROJECT_DIR}/.ccache
     CCACHE_MAXSIZE: 1Gi
   cache:
     key: ${output}_${BUILD_TYPE}
     policy: pull-push
     paths:
       - .ccache/
       - third-party/google-test
       - third-party/pybind11
   before_script:
     - ccache --zero-stats || true
   after_script:
     - ccache --show-stats || true
 
 # ------------------------------------------------------------------------------
 .image_debian_bullseye:
   image: registry.gitlab.com/akantu/akantu/debian:bullseye
 
 .image_ubuntu_lts:
   image: registry.gitlab.com/akantu/akantu/ubuntu:lts
 
 .image_manylinux:
   image: registry.gitlab.com/akantu/akantu/manylinux:2010_x86_64
 
 # ------------------------------------------------------------------------------
 .compiler_gcc:
   variables:
     CC: /usr/lib/ccache/gcc
     CXX: /usr/lib/ccache/g++
     FC: gfortran
     GCOV_EXECUTABLE: gcov
 
 .compiler_clang:
   variables:
     CC: /usr/lib/ccache/clang
     CXX: /usr/lib/ccache/clang++
     FC: gfortran
     GCOV_EXECUTABLE: llvm-cov gcov
 
 .build_coverage:
   variables:
     TEST_EXAMPLES: "FALSE"
     BUILD_TYPE: "Coverage"
 
 .build_release:
   variables:
     TEST_EXAMPLES: "TRUE"
     BUILD_TYPE: "Release"
 
 .build_valgrind:
   variables:
     TEST_EXAMPLES: "FALSE"
     BUILD_TYPE: "Valgrind"
 
 # ------------------------------------------------------------------------------
 .debian_bullseye_gcc:
   variables:
     output: debian_bullseye_gcc
   extends:
     - .compiler_gcc
     - .image_debian_bullseye
     - .cache_build
 
 .debian_bullseye_clang:
   variables:
     output: debian_bullseye_clang
   extends:
     - .compiler_clang
     - .image_debian_bullseye
     - .cache_build
 
 .ubuntu_lts_gcc:
   variables:
     output: ubuntu_lts_gcc
   extends:
     - .compiler_gcc
     - .image_ubuntu_lts
     - .cache_build
 
 .manylinux_2010_x64_gcc:
   variables:
     output: manylinux_2010_x64_gcc
   extends:
     - .compiler_gcc
     - .image_manylinux
     - .cache_build