diff --git a/README.md b/README.md
index 6b6562e..a321f7e 100644
--- a/README.md
+++ b/README.md
@@ -19,9 +19,9 @@ for (const edge of iter(maximumCardinalityMatching([[1, 2], [2, 3], [3, 4]]))) {
 // [3,4]
 ```
 
-[![License](https://img.shields.io/github/license/aureooms/js-maximum-matching.svg)](https://raw.githubusercontent.com/aureooms/js-maximum-matching/master/LICENSE)
+[![License](https://img.shields.io/github/license/aureooms/js-maximum-matching.svg)](https://raw.githubusercontent.com/aureooms/js-maximum-matching/main/LICENSE)
 [![Version](https://img.shields.io/npm/v/@aureooms/js-maximum-matching.svg)](https://www.npmjs.org/package/@aureooms/js-maximum-matching)
-[![Build](https://img.shields.io/travis/aureooms/js-maximum-matching/master.svg)](https://travis-ci.org/aureooms/js-maximum-matching/branches)
+[![Build](https://img.shields.io/travis/aureooms/js-maximum-matching/main.svg)](https://travis-ci.org/aureooms/js-maximum-matching/branches)
 [![Dependencies](https://img.shields.io/david/aureooms/js-maximum-matching.svg)](https://david-dm.org/aureooms/js-maximum-matching)
 [![Dev dependencies](https://img.shields.io/david/dev/aureooms/js-maximum-matching.svg)](https://david-dm.org/aureooms/js-maximum-matching?type=dev)
 [![GitHub issues](https://img.shields.io/github/issues/aureooms/js-maximum-matching.svg)](https://github.com/aureooms/js-maximum-matching/issues)
@@ -29,7 +29,7 @@ for (const edge of iter(maximumCardinalityMatching([[1, 2], [2, 3], [3, 4]]))) {
 
 [![Code issues](https://img.shields.io/codeclimate/issues/aureooms/js-maximum-matching.svg)](https://codeclimate.com/github/aureooms/js-maximum-matching/issues)
 [![Code maintainability](https://img.shields.io/codeclimate/maintainability/aureooms/js-maximum-matching.svg)](https://codeclimate.com/github/aureooms/js-maximum-matching/trends/churn)
-[![Code coverage (cov)](https://img.shields.io/codecov/c/gh/aureooms/js-maximum-matching/master.svg)](https://codecov.io/gh/aureooms/js-maximum-matching)
+[![Code coverage (cov)](https://img.shields.io/codecov/c/gh/aureooms/js-maximum-matching/main.svg)](https://codecov.io/gh/aureooms/js-maximum-matching)
 [![Code technical debt](https://img.shields.io/codeclimate/tech-debt/aureooms/js-maximum-matching.svg)](https://codeclimate.com/github/aureooms/js-maximum-matching/trends/technical_debt)
 [![Documentation](https://aureooms.github.io/js-maximum-matching/badge.svg)](https://aureooms.github.io/js-maximum-matching/source.html)
 [![Package size](https://img.shields.io/bundlephobia/minzip/@aureooms/js-maximum-matching)](https://bundlephobia.com/result?p=@aureooms/js-maximum-matching)
diff --git a/doc/manual/example.md b/doc/manual/example.md
index 6cf8248..1744851 100644
--- a/doc/manual/example.md
+++ b/doc/manual/example.md
@@ -1,3 +1,3 @@
 # Examples
 
-> More examples in [the test files](https://github.com/aureooms/js-maximum-matching/tree/master/test/src).
+> More examples in [the test files](https://github.com/aureooms/js-maximum-matching/tree/main/test/src).