diff --git a/docs/advanced-reading/code-quality.md b/docs/advanced-reading/code-quality.md
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+++ b/docs/advanced-reading/code-quality.md
@@ -5,7 +5,6 @@ We monitor the general source code quality at three places:
 * [codacy](https://www.codacy.com/) is a hosted service to monitor code quality. It thereby combines the results of available open source code quality checkers such as [Checkstyle](https://checkstyle.sourceforge.io/) or [PMD](https://pmd.github.io/). The code quality analysis for JabRef is available at [https://app.codacy.com/gh/JabRef/jabref/dashboard](https://app.codacy.com/gh/JabRef/jabref/dashboard), especially the [list of open issues](https://app.codacy.com/gh/JabRef/jabref/issues/index). In case a rule feels wrong, it is most likely a PMD rule. The JabRef team can change the configuration at [https://app.codacy.com/p/306789/patterns/list?engine=9ed24812-b6ee-4a58-9004-0ed183c45b8f](https://app.codacy.com/p/306789/patterns/list?engine=9ed24812-b6ee-4a58-9004-0ed183c45b8f).
 * [codecov](https://codecov.io/) is a solution to check code coverage of test cases. The code coverage metrics for JabRef are available at [https://codecov.io/github/JabRef/jabref](https://codecov.io/github/JabRef/jabref).
 * [Teamscale](https://www.cqse.eu/de/produkte/teamscale/landing/) is a popular German product analyzing code quality. The analysis results are available at [https://demo.teamscale.com/findings.html\#/jabref/?](https://demo.teamscale.com/findings.html#/jabref/?).
-* [SonarQube](https://www.sonarqube.org/) is a popular service analyzing code quality. The results are available at [https://sonarcloud.io/dashboard?id=JabRef\_jabref](https://sonarcloud.io/dashboard?id=JabRef_jabref).
 
 We strongly recommend to read following two books on code quality: