diff --git a/.github/dependabot.yml b/.github/dependabot.yml
deleted file mode 100644
index eeb6a75..0000000
--- a/.github/dependabot.yml
+++ /dev/null
@@ -1,36 +0,0 @@
----
-version: 2
-updates:
-- package-ecosystem: pip
-  directory: "/"
-  schedule:
-    interval: weekly
-    day: thursday
-    time: '14:00'
-    timezone: Europe/Berlin
-  pull-request-branch-name:
-    separator: "-"
-  open-pull-requests-limit: 99
-  commit-message:
-    prefix: "module:"
-  target-branch: three
-  versioning-strategy: lockfile-only
-  allow:
-  - dependency-type: direct
-  - dependency-type: indirect
-- package-ecosystem: pip
-  directory: "/"
-  schedule:
-    interval: weekly
-    day: thursday
-    time: '14:00'
-    timezone: Europe/Berlin
-  pull-request-branch-name:
-    separator: "-"
-  open-pull-requests-limit: 99
-  commit-message:
-    prefix: "module:"
-  versioning-strategy: lockfile-only
-  allow:
-  - dependency-type: direct
-  - dependency-type: indirect
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index 1e442f6..0000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,44 +0,0 @@
----
-name: ci
-
-on:
-  push:
-    branches: [master, three]
-  pull_request:
-    branches: [master, three]
-  workflow_dispatch:
-  schedule:
-  - cron: '37 4 * * 4'  # weekly on thursday morning
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version:
-        - '2.7'
-        # Python 3.4 on GHA doesn't work due to fastdiff==0.2.0 failing with:
-        #   pkg_resources.DistributionNotFound: The 'setuptools_scm>=1.15.0' distribution was not found and is required by the application
-        #- '3.4'
-        - '3.5'
-        - '3.7'
-        - '3.9'
-    steps:
-    - uses: actions/checkout@v2
-    - run: python -m pip install --upgrade pip
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install Poetry
-      run: |
-        pip install poetry==1.0.10
-    - name: Install dependencies
-      run: |
-        poetry install
-    - name: Lint
-      run: |
-        make lint
-    - name: Test
-      run: |
-        make test
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 2a7716a..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,13 +0,0 @@
----
-os: linux
-language: python
-python:
-- "3.4"
-
-install:
-- pip install poetry==1.0.10
-- poetry install
-
-script:
-- make lint
-- make test
diff --git a/Makefile b/Makefile
index 8552437..a9fece6 100644
--- a/Makefile
+++ b/Makefile
@@ -21,17 +21,6 @@ lint: ## Lint all source code
 test: ## Run all tests
 	poetry run pytest
 
-.PHONY: rebase-three-branch
-rebase-three-branch: ## Rebase the py3 branch with master contents
-	git stash
-	git checkout master
-	git pull
-	git checkout three
-	git rebase -i origin/master
-	git push --force-with-lease
-	git checkout master
-	git stash pop
-
 .PHONY: help
 help: ## Print this help text
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-15s\033[0m %s\n", $$1, $$2}'
diff --git a/README.md b/README.md
index 1e500b2..1596d1e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # python-veml6070
 
-![ci](https://github.com/cmur2/python-veml6070/workflows/ci/badge.svg?branch=master) [![Build Status](https://travis-ci.com/cmur2/python-veml6070.svg?branch=master)](https://travis-ci.com/cmur2/python-veml6070)
+**Note: This `legacy` branch is unmaintained and contains the Python 2.7 compatible code.**
 
 A Python library for accessing the [VEML6070 digital UV light sensor](http://www.vishay.com/docs/84277/veml6070.pdf) from Vishay via `python-smbus` using the I2C interface.