diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6394408b..2a7617a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 #### Changed
 
 * [#492](https://github.com/shlinkio/shlink/issues/492) Updated to monolog 2, together with other dependencies, like Symfony 5 and infection-php.
+* [#527](https://github.com/shlinkio/shlink/issues/527) Increased minimum required mutation score for unit tests to 80%.
 
 #### Deprecated
 
diff --git a/composer.json b/composer.json
index fd3840bb..0ded66fe 100644
--- a/composer.json
+++ b/composer.json
@@ -130,9 +130,9 @@
         "test:db:postgres": "DB_DRIVER=postgres composer test:db:sqlite",
         "test:api": "bin/test/run-api-tests.sh",
         "test:unit:pretty": "phpdbg -qrr vendor/bin/phpunit --order-by=random --colors=always --coverage-html build/coverage",
-        "infect": "infection --threads=4 --min-msi=75 --log-verbosity=default --only-covered",
-        "infect:ci": "infection --threads=4 --min-msi=75 --log-verbosity=default --only-covered --coverage=build",
-        "infect:show": "infection --threads=4 --min-msi=75 --log-verbosity=default --only-covered --show-mutations",
+        "infect": "infection --threads=4 --min-msi=80 --log-verbosity=default --only-covered",
+        "infect:ci": "infection --threads=4 --min-msi=80 --log-verbosity=default --only-covered --coverage=build",
+        "infect:show": "infection --threads=4 --min-msi=80 --log-verbosity=default --only-covered --show-mutations",
         "infect:test": [
             "@test:unit:ci",
             "@infect:ci"