diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..e7d4bb5
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,503 @@
+kind: pipeline
+type: docker
+name: build
+
+steps:
+- name: restore ASDF cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'asdf-{{ os }}-{{ arch }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - .asdf
+
+- name: restore build cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'elixir-{{ checksum "mix.lock" }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - deps
+    - _build
+    - .hex
+    - .mix
+    - .rebar3
+
+- name: install dependencies
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+    ASDF_DIR: /root/.asdf
+  depends_on:
+  - restore ASDF cache
+  - restore build cache
+  commands:
+  - asdf_install
+  - rm -rf .asdf/downloads
+  - . $ASDF_DIR/asdf.sh
+  - mix local.hex --if-missing --force
+  - mix local.rebar --if-missing --force
+  - mix deps.get
+  - mix deps.compile
+
+- name: store ASDF cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  depends_on:
+  - install dependencies
+  settings:
+    rebuild: true
+    override: false
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'asdf-{{ os }}-{{ arch }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - .asdf
+
+- name: store build cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  depends_on:
+  - install dependencies
+  settings:
+    rebuild: true
+    override: false
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'elixir-{{ checksum "mix.lock" }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - deps
+    - _build
+    - .hex
+    - .mix
+    - .rebar3
+
+---
+
+kind: pipeline
+type: docker
+name: test
+
+depends_on:
+  - build
+
+steps:
+- name: restore ASDF cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'asdf-{{ os }}-{{ arch }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - .asdf
+
+- name: restore build cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'elixir-{{ checksum "mix.lock" }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - deps
+    - _build
+    - .hex
+    - .mix
+    - .rebar3
+
+- name: mix compile
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - restore ASDF cache
+  - restore build cache
+  commands:
+  - asdf mix compile --warnings-as-errors
+
+- name: mix test
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix test
+
+- name: mix credo
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix credo --strict
+
+- name: mix hex.audit
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix hex.audit
+
+- name: mix format
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix format --check-formatted
+
+- name: mix deps.unlock
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix deps.unlock --check-unused
+
+- name: mix doctor
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - asdf mix doctor --full
+
+- name: mix git_ops.check_message
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+  depends_on:
+  - mix compile
+  commands:
+  - git log -1 --format=%s > .last_commit_message
+  - asdf mix git_ops.check_message .last_commit_message
+
+---
+kind: pipeline
+type: docker
+name: git ops
+
+trigger:
+  branch:
+  - main
+  event:
+  - push
+
+depends_on:
+  - test
+
+steps:
+- name: restore ASDF cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'asdf-{{ os }}-{{ arch }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - .asdf
+
+- name: restore build cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'elixir-{{ checksum "mix.lock" }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - deps
+    - _build
+    - .hex
+    - .mix
+    - .rebar3
+
+- name: mix git_ops.release
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  depends_on:
+  - restore ASDF cache
+  - restore build cache
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+    ASDF_DIR: /root/.asdf
+    DRONE_TOKEN:
+      from_secret: DRONE_TOKEN
+  commands:
+    - git fetch --tags
+    - . $ASDF_DIR/asdf.sh
+    - mix git_ops.project_info --format=shell > before.env
+    - mix git_ops.release --yes --no-major || true
+    - mix git_ops.project_info --format=shell > after.env
+    - . ./before.env
+    - export OLD_APP_VERSION=$${APP_VERSION}
+    - . ./after.env
+    - export NEW_APP_VERSION=$${APP_VERSION}
+    - if [ "v$${OLD_APP_VERSION}" != "v$${NEW_APP_VERSION}" ]; then
+    -   export GIT_URL=$(echo $DRONE_GIT_HTTP_URL | sed -e "s/:\\/\\//:\\/\\/$DRONE_REPO_OWNER:$DRONE_TOKEN@/")
+    -   git push $${GIT_URL} "HEAD:${DRONE_COMMIT_REF}" "refs/tags/v$${NEW_APP_VERSION}"
+    - fi
+
+---
+
+kind: pipeline
+type: docker
+name: release
+
+trigger:
+  ref:
+    include:
+    - refs/tags/v**
+
+depends_on:
+  - test
+
+steps:
+- name: restore ASDF cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'asdf-{{ os }}-{{ arch }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - .asdf
+
+- name: restore build cache
+  image: meltwater/drone-cache
+  pull: "always"
+  environment:
+    AWS_ACCESS_KEY_ID:
+      from_secret: ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY:
+      from_secret: SECRET_ACCESS_KEY
+    AWS_PLUGIN_PATH_STYLE: true
+  settings:
+    restore: true
+    endpoint:
+      from_secret: S3_ENDPOINT
+    bucket:
+      from_secret: CACHE_BUCKET
+    region: us-east-1
+    path-style: true
+    cache_key: 'elixir-{{ checksum "mix.lock" }}-{{ checksum ".tool-versions" }}'
+    mount:
+    - deps
+    - _build
+    - .hex
+    - .mix
+    - .rebar3
+
+- name: build artifacts
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  depends_on:
+  - restore ASDF cache
+  - restore build cache
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+    ASDF_DIR: /root/.asdf
+  commands:
+    - . $ASDF_DIR/asdf.sh
+    - mix git_ops.project_info --format=shell > app.env
+    - . ./app.env
+    - mkdir artifacts
+    - mix hex.build -o "artifacts/$${APP_NAME}-$${APP_VERSION}-pkg.tar"
+    - gzip "artifacts/$${APP_NAME}-$${APP_VERSION}-pkg.tar"
+    - mix docs
+    - tar zcvf "artifacts/$${APP_NAME}-$${APP_VERSION}-docs.tar.gz" doc/
+    - git tag -l --format='%(contents:subject)' v$${APP_VERSION} > tag_subject
+    - git tag -l --format='%(contents:body)' v$${APP_VERSION} > tag_body
+
+- name: gitea release
+  image: plugins/gitea-release
+  depends_on:
+  - build artifacts
+  settings:
+    api_key:
+      from_secret: DRONE_TOKEN
+    base_url: https://code.harton.nz
+    files: artifacts/*.tar.gz
+    checksum: sha256
+    title: tag_subject
+    note: tag_body
+
+- name: hex release
+  image: code.harton.nz/james/asdf_container:latest
+  pull: "always"
+  depends_on:
+  - restore ASDF cache
+  - restore build cache
+  environment:
+    MIX_ENV: test
+    HEX_HOME: /drone/src/.hex
+    MIX_HOME: /drone/src/.mix
+    REBAR_BASE_DIR: /drone/src/.rebar3
+    ASDF_DATA_DIR: /drone/src/.asdf
+    ASDF_DIR: /root/.asdf
+    HEX_API_KEY:
+      from_secret: HEX_API_KEY
+  commands:
+    - . $ASDF_DIR/asdf.sh
+    - mix hex.publish --yes
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index 4e47061..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,138 +0,0 @@
-stages:
-  - build
-  - test
-  - release
-
-variables:
-  MIX_ENV: "test"
-  PACKAGE_REGISTRY_URL: "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/generic/"
-  HEX_HOME: "$CI_PROJECT_DIR/.hex"
-  MIX_HOME: "$CI_PROJECT_DIR/.mix"
-
-build:
-  image: elixir:latest
-  stage: build
-  cache:
-    key: "$CI_JOB_NAME"
-    paths:
-      - deps
-      - _build
-      - .hex
-      - .mix
-  script:
-    - mix local.hex --force
-    - mix local.rebar --force
-    - mix deps.get
-    - mix deps.compile
-    - mix git_ops.project_info -f dotenv > project_info.env
-  artifacts:
-    paths:
-      - _build/
-      - deps/
-      - .hex
-      - .mix
-    reports:
-      dotenv: project_info.env
-
-test:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: test
-  script:
-    - mix test
-
-credo:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: test
-  script:
-    - mix credo
-
-audit:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: test
-  script:
-    - mix hex.audit
-
-format:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: test
-  script:
-    - mix format --check-formatted
-
-pages:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: release
-  script:
-    - mix docs -o public
-  artifacts:
-    paths:
-      - public
-  only:
-    - main@jimsy/heap
-
-git_ops:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: release
-  only:
-    - main@jimsy/heap
-  except:
-    variables:
-      - $CI_COMMIT_MESSAGE =~ /chore\:\ release version/
-  script:
-    - |
-      export OLD_APP_VERSION=$APP_VERSION
-      mkdir -p artifacts
-      git config --global user.name "Gitlab Runner for ${GITLAB_USER_NAME}"
-      git config --global user.email "${GITLAB_USER_EMAIL}"
-      mix git_ops.release --yes || true
-      mix git_ops.project_info -f shell > artifacts/env
-      source artifacts/env
-      if [ "v${OLD_APP_VERSION}" != "v${APP_VERSION}" ]; then
-        mix hex.build -o "artifacts/${APP_NAME}-${APP_VERSION}.tar"
-        gzip "artifacts/${APP_NAME}-${APP_VERSION}.tar"
-        mix docs && tar zcvf "artifacts/${APP_NAME}-${APP_VERSION}-docs.tar.gz" doc/
-        curl --header "JOB_TOKEN: ${CI_JOB_TOKEN}" --upload-file "artifacts/${APP_NAME}-${APP_VERSION}.tar.gz" "${PACKAGE_REGISTRY_URL}/${APP_NAME}/${APP_VERSION}/${APP_NAME}-${APP_VERSION}.tar.gz"
-        curl --header "JOB_TOKEN: ${CI_JOB_TOKEN}" --upload-file "artifacts/${APP_NAME}-${APP_VERSION}-docs.tar.gz" "${PACKAGE_REGISTRY_URL}/${APP_NAME}/${APP_VERSION}/${APP_NAME}-${APP_VERSION}-docs.tar.gz"
-        git push "https://project_${CI_PROJECT_ID}_bot:${RELEASE_TOKEN}@gitlab.com/${CI_PROJECT_PATH}.git" "HEAD:${CI_COMMIT_REF_NAME}" "refs/tags/v${APP_VERSION}"
-      fi
-  artifacts:
-    paths:
-      - artifacts/*
-
-release-gitlab:
-  image: registry.gitlab.com/gitlab-org/release-cli:latest
-  dependencies:
-    - build
-  stage: release
-  only:
-    - tags@jimsy/heap
-    - /^v\d+\.\d+\.\d+(-\w+)?$/
-  script:
-    - release-cli create \
-      --name "Release ${APP_NAME} ${APP_VERSION}" \
-      --description "./CHANGELOG.md" \
-      --tag-name "v${APP_VERSION}" \
-      --assets-link "{\"name\":\"${APP_NAME}-${APP_VERSION}.tar.gz\",\"url\":\"${PACKAGE_REGISTRY_URL}/${APP_NAME}/${APP_VERSION}/${APP_NAME}-${APP_VERSION}.tar.gz\"}" \
-      --assets-link "{\"name\":\"${APP_NAME}-${APP_VERSION}-docs.tar.gz\",\"url\":\"${PACKAGE_REGISTRY_URL}/${APP_NAME}/${APP_VERSION}/${APP_NAME}-${APP_VERSION}-docs.tar.gz\"}"
-
-release-hex:
-  image: elixir:latest
-  dependencies:
-    - build
-  stage: release
-  only:
-    - tags@jimsy/heap
-    - /^v\d+\.\d+\.\d+(-\w+)?$/
-  script:
-    - mix hex.publish --yes
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..44acbf0
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,2 @@
+erlang 26.0.2
+elixir 1.15.4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a0b888..ef2dbbf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,14 +5,10 @@ See [Conventional Commits](Https://conventionalcommits.org) for commit guideline
 
 <!-- changelog -->
 
-## [v3.0.0](https://gitlab.com/jimsy/heap/compare/v2.0.2...v3.0.0) (2023-01-16)
+## [v3.0.0](https://code.harton.nz/james/heap/compare/v2.0.2...v3.0.0) (2023-01-16)
+
 ### Breaking Changes:
 
-* Relicense to HL3-FULL.
-
-
-
-## [v2.0.2](https://gitlab.com/jimsy/heap/compare/v2.0.2...v2.0.2) (2020-12-28)
-
-
+- Relicense to HL3-FULL.
 
+## [v2.0.2](https://code.harton.nz/james/heap/compare/v2.0.2...v2.0.2) (2020-12-28)
diff --git a/README.md b/README.md
index a049d1c..46689a4 100644
--- a/README.md
+++ b/README.md
@@ -1,32 +1,32 @@
 # Heap
-[![pipeline status](https://gitlab.com/jimsy/heap/badges/main/pipeline.svg)](https://gitlab.com/jimsy/heap/commits/main)
+
+[![Build Status](https://drone.harton.nz/api/badges/james/heap/status.svg?ref=refs/heads/main)](https://drone.harton.nz/james/heap)
 [![Hex.pm](https://img.shields.io/hexpm/v/heap.svg)](https://hex.pm/packages/heap)
 [![Hippocratic License HL3-FULL](https://img.shields.io/static/v1?label=Hippocratic%20License&message=HL3-FULL&labelColor=5e2751&color=bc8c3d)](https://firstdonoharm.dev/version/3/0/full.html)
 
 A Heap is a very useful data structure, because it sorts, quickly, at insert time.
 
-
 See also: https://en.wikipedia.org/wiki/Heap_(data_structure)
 
 You can use it for things like:
 
-  - Help with scientific computing
-  - Quickly sorting
-  - Priority queues
+- Help with scientific computing
+- Quickly sorting
+- Priority queues
 
 ## Installation
 
 This package is [available in Hex](https://hex.pm/packages/heap):
 
-  1. Add heap to your list of dependencies in `mix.exs`:
+1. Add heap to your list of dependencies in `mix.exs`:
 
-        ```elixir
-        def deps do
-          [{:heap, "~> 2.0"}]
-        end
-        ```
+   ```elixir
+   def deps do
+     [{:heap, "~> 2.0"}]
+   end
+   ```
 
-  2. Run `mix deps.get`
+2. Run `mix deps.get`
 
 ## Deprecation warning
 
@@ -105,7 +105,7 @@ This software is licensed under the terms of the
 this package for the terms.
 
 This license actively proscribes this software being used by and for some
-industries, countries and activities.  If your usage of this software doesn't
+industries, countries and activities. If your usage of this software doesn't
 comply with the terms of this license, then [contact me](mailto:james@harton.nz)
 with the details of your use-case to organise the purchase of a license - the
 cost of which may include a donation to a suitable charity or NGO.
diff --git a/config/config.exs b/config/config.exs
index 7975d41..bbc7fd2 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -3,7 +3,7 @@ import Config
 config :git_ops,
   mix_project: Mix.Project.get!(),
   changelog_file: "CHANGELOG.md",
-  repository_url: "https://gitlab.com/jimsy/heap",
+  repository_url: "https://code.harton.nz/james/heap",
   manage_mix_version?: true,
   manage_readme_version: "README.md",
   version_tag_prefix: "v"
diff --git a/lib/heap.ex b/lib/heap.ex
index cd0ce4b..861f7a0 100644
--- a/lib/heap.ex
+++ b/lib/heap.ex
@@ -7,7 +7,7 @@ defmodule Heap do
   See also: [Heap (data structure) on Wikipedia](https://en.wikipedia.org/wiki/Heap_(data_structure)).
   """
 
-  @type t() :: %Heap{
+  @type t :: %Heap{
           data: tuple() | nil,
           size: non_neg_integer(),
           comparator: :> | :< | (any(), any() -> boolean())
@@ -26,7 +26,7 @@ defmodule Heap do
       ...>   |> Heap.root()
       1
   """
-  @spec min() :: t
+  @spec min :: t
   def min, do: Heap.new(:<)
 
   @doc """
@@ -42,7 +42,7 @@ defmodule Heap do
       ...>   |> Heap.root()
       10
   """
-  @spec max() :: t
+  @spec max :: t
   def max, do: Heap.new(:>)
 
   @doc """
@@ -56,7 +56,7 @@ defmodule Heap do
       ...>   |> Heap.comparator()
       :<
   """
-  @spec new() :: t
+  @spec new :: t
   def new, do: %Heap{comparator: :<}
 
   @doc """
@@ -91,10 +91,9 @@ defmodule Heap do
         ...>   |> Enum.map(fn {_, what} -> what end)
         [:milk, :jam, :bread, :eggs]
   """
-  @spec new(:> | :<) :: t
+  @spec new(:> | :< | (any, any -> boolean)) :: t
   def new(:>), do: %Heap{comparator: :>}
   def new(:<), do: %Heap{comparator: :<}
-  @spec new((any, any -> boolean)) :: t
   def new(fun) when is_function(fun, 2), do: %Heap{comparator: fun}
 
   @doc """
@@ -214,7 +213,7 @@ defmodule Heap do
       ...>   |> Heap.comparator()
       :<
   """
-  @spec comparator(t) :: :< | :>
+  @spec comparator(t) :: :< | :> | (any, any -> boolean)
   def comparator(%Heap{comparator: d}), do: d
 
   @doc """
diff --git a/mix.exs b/mix.exs
index 098a830..19ae10e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -32,7 +32,7 @@ defmodule Heap.Mixfile do
       maintainers: ["James Harton <james@harton.nz>"],
       licenses: ["HL3-FULL"],
       links: %{
-        "Repository" => "https://gitlab.com/jimsy/heap",
+        "Repository" => "https://code.harton.nz/james/heap",
         "Docs" => "https://hexdocs.pm/heap"
       }
     ]
@@ -48,11 +48,17 @@ defmodule Heap.Mixfile do
   #
   # Type "mix help deps" for more examples and options
   defp deps do
+    opts = [only: ~w[dev test]a, runtime: false]
+
     [
-      {:ex_doc, "~> 0.30", only: ~w[dev test]a},
-      {:earmark, "~> 1.4", only: ~w[dev test]a},
-      {:credo, "~> 1.6", only: ~w[dev test]a, runtime: false},
-      {:git_ops, "~> 2.4", only: ~w[dev test]a, runtime: false}
+      {:credo, "~> 1.7", opts},
+      {:dialyxir, "~> 1.3", opts},
+      {:doctor, "~> 0.21", opts},
+      {:earmark, ">= 0.0.0", opts},
+      {:ex_check, "~> 0.15", opts},
+      {:ex_doc, ">= 0.0.0", opts},
+      {:git_ops, "~> 2.6", opts},
+      {:mix_audit, "~> 2.1", opts}
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index 90e2df6..7b9bcff 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,21 +1,23 @@
 %{
-  "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm", "7af5c7e09fe1d40f76c8e4f9dd2be7cebd83909f31fee7cd0e9eadc567da8353"},
-  "credo": {:hex, :credo, "1.6.1", "7dc76dcdb764a4316c1596804c48eada9fff44bd4b733a91ccbf0c0f368be61e", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2.8", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "698607fb5993720c7e93d2d8e76f2175bba024de964e160e2f7151ef3ab82ac5"},
-  "dialyxir": {:hex, :dialyxir, "1.0.0-rc.4", "71b42f5ee1b7628f3e3a6565f4617dfb02d127a0499ab3e72750455e986df001", [:mix], [{:erlex, "~> 0.1", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm"},
+  "bunt": {:hex, :bunt, "0.2.1", "e2d4792f7bc0ced7583ab54922808919518d0e57ee162901a16a1b6664ef3b14", [:mix], [], "hexpm", "a330bfb4245239787b15005e66ae6845c9cd524a288f0d141c148b02603777a5"},
+  "credo": {:hex, :credo, "1.7.0", "6119bee47272e85995598ee04f2ebbed3e947678dee048d10b5feca139435f75", [:mix], [{:bunt, "~> 0.2.1", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2.8", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "6839fcf63d1f0d1c0f450abc8564a57c43d644077ab96f2934563e68b8a769d7"},
+  "decimal": {:hex, :decimal, "2.1.1", "5611dca5d4b2c3dd497dec8f68751f1f1a54755e8ed2a966c2633cf885973ad6", [:mix], [], "hexpm", "53cfe5f497ed0e7771ae1a475575603d77425099ba5faef9394932b35020ffcc"},
+  "dialyxir": {:hex, :dialyxir, "1.3.0", "fd1672f0922b7648ff9ce7b1b26fcf0ef56dda964a459892ad15f6b4410b5284", [:mix], [{:erlex, ">= 0.2.6", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "00b2a4bcd6aa8db9dcb0b38c1225b7277dca9bc370b6438715667071a304696f"},
+  "doctor": {:hex, :doctor, "0.21.0", "20ef89355c67778e206225fe74913e96141c4d001cb04efdeba1a2a9704f1ab5", [:mix], [{:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm", "a227831daa79784eb24cdeedfa403c46a4cb7d0eab0e31232ec654314447e4e0"},
   "earmark": {:hex, :earmark, "1.4.19", "3854a17305c880cc46305af15fb1630568d23a709aba21aaa996ced082fc29d7", [:mix], [{:earmark_parser, ">= 1.4.18", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "d5a8c9f9e37159a8fdd3ea8437fb4e229eaf56d5129b9a011dc4780a4872079d"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.33", "3c3fd9673bb5dcc9edc28dd90f50c87ce506d1f71b70e3de69aa8154bc695d44", [:mix], [], "hexpm", "2d526833729b59b9fdb85785078697c72ac5e5066350663e5be6a1182da61b8f"},
-  "erlex": {:hex, :erlex, "0.1.6", "c01c889363168d3fdd23f4211647d8a34c0f9a21ec726762312e08e083f3d47e", [:mix], [], "hexpm"},
-  "espec": {:hex, :espec, "0.8.28", "f002710673d215876c4ca6fc74cbf5e330954badea7389d2284d2050940f1779", [:mix], [{:meck, "~> 0.8.4", [hex: :meck, optional: false]}]},
+  "erlex": {:hex, :erlex, "0.2.6", "c7987d15e899c7a2f34f5420d2a2ea0d659682c06ac607572df55a43753aa12e", [:mix], [], "hexpm", "2ed2e25711feb44d52b17d2780eabf998452f6efda104877a3881c2f8c0c0c75"},
+  "ex_check": {:hex, :ex_check, "0.15.0", "074b94c02de11c37bba1ca82ae5cc4926e6ccee862e57a485b6ba60fca2d8dc1", [:mix], [], "hexpm", "33848031a0c7e4209c3b4369ce154019788b5219956220c35ca5474299fb6a0e"},
   "ex_doc": {:hex, :ex_doc, "0.30.0", "ed94bf5183f559d2f825e4f866cc0eab277bbb17da76aff40f8e0f149656943e", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "6743fe46704fe27e2f2558faa61f00e5356528768807badb2092d38476d6dac2"},
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
   "git_cli": {:hex, :git_cli, "0.3.0", "a5422f9b95c99483385b976f5d43f7e8233283a47cda13533d7c16131cb14df5", [:mix], [], "hexpm", "78cb952f4c86a41f4d3511f1d3ecb28edb268e3a7df278de2faa1bd4672eaf9b"},
-  "git_ops": {:hex, :git_ops, "2.4.5", "185a724dfde3745edd22f7571d59c47a835cf54ded67e9ccbc951920b7eec4c2", [:mix], [{:git_cli, "~> 0.2", [hex: :git_cli, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "e323a5b01ad53bc8c19c3a444be3e61ed7803ecd2e95530446ae9327d0143ecc"},
-  "inch_ex": {:hex, :inch_ex, "2.0.0", "24268a9284a1751f2ceda569cd978e1fa394c977c45c331bb52a405de544f4de", [:mix], [{:bunt, "~> 0.2", [hex: :bunt, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "96d0ec5ecac8cf63142d02f16b7ab7152cf0f0f1a185a80161b758383c9399a8"},
-  "jason": {:hex, :jason, "1.2.2", "ba43e3f2709fd1aa1dce90aaabfd039d000469c05c56f0b8e31978e03fa39052", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "18a228f5f0058ee183f29f9eae0805c6e59d61c3b006760668d8d18ff0d12179"},
+  "git_ops": {:hex, :git_ops, "2.6.0", "e0791ee1cf5db03f2c61b7ebd70e2e95cba2bb9b9793011f26609f22c0900087", [:mix], [{:git_cli, "~> 0.2", [hex: :git_cli, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "b98fca849b18aaf490f4ac7d1dd8c6c469b0cc3e6632562d366cab095e666ffe"},
+  "jason": {:hex, :jason, "1.4.1", "af1504e35f629ddcdd6addb3513c3853991f694921b1b9368b0bd32beb9f1b63", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "fbb01ecdfd565b56261302f7e1fcc27c4fb8f32d56eab74db621fc154604a7a1"},
   "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.1", "cc9e3ca312f1cfeccc572b37a09980287e243648108384b97ff2b76e505c3555", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "e127a341ad1b209bd80f7bd1620a15693a9908ed780c3b763bccf7d200c767c6"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.2", "ad87296a092a46e03b7e9b0be7631ddcf64c790fa68a9ef5323b6cbb36affc72", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "f3f5a1ca93ce6e092d92b6d9c049bcda58a3b617a8d888f8e7231c85630e8108"},
-  "meck": {:hex, :meck, "0.8.8", "eeb3efe811d4346e1a7f65b2738abc2ad73cbe1a2c91b5dd909bac2ea0414fa6", [:rebar3], []},
+  "mix_audit": {:hex, :mix_audit, "2.1.1", "653aa6d8f291fc4b017aa82bdb79a4017903902ebba57960ef199cbbc8c008a1", [:make, :mix], [{:jason, "~> 1.1", [hex: :jason, repo: "hexpm", optional: false]}, {:yaml_elixir, "~> 2.9", [hex: :yaml_elixir, repo: "hexpm", optional: false]}], "hexpm", "541990c3ab3a7bb8c4aaa2ce2732a4ae160ad6237e5dcd5ad1564f4f85354db1"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.3.1", "2c54013ecf170e249e9291ed0a62e5832f70a476c61da16f6aac6dca0189f2af", [:mix], [], "hexpm", "2682e3c0b2eb58d90c6375fc0cc30bc7be06f365bf72608804fb9cffa5e1b167"},
-  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
+  "yamerl": {:hex, :yamerl, "0.10.0", "4ff81fee2f1f6a46f1700c0d880b24d193ddb74bd14ef42cb0bcf46e81ef2f8e", [:rebar3], [], "hexpm", "346adb2963f1051dc837a2364e4acf6eb7d80097c0f53cbdc3046ec8ec4b4e6e"},
+  "yaml_elixir": {:hex, :yaml_elixir, "2.9.0", "9a256da867b37b8d2c1ffd5d9de373a4fda77a32a45b452f1708508ba7bbcb53", [:mix], [{:yamerl, "~> 0.10", [hex: :yamerl, repo: "hexpm", optional: false]}], "hexpm", "0cb0e7d4c56f5e99a6253ed1a670ed0e39c13fc45a6da054033928607ac08dfc"},
 }
diff --git a/renovate.json b/renovate.json
deleted file mode 100644
index a932bc9..0000000
--- a/renovate.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "extends": ["gitlab>jimsy/renovate"]
-}