diff --git a/pom.xml b/pom.xml
index 7e5bb26..37c2b3c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -85,7 +85,7 @@
 		<version.org.apache.maven.plugin.api>3.2.5</version.org.apache.maven.plugin.api>
 		<version.org.apache.maven.plugins.compiler>3.13.0</version.org.apache.maven.plugins.compiler>
 		<version.org.apache.maven.plugins.deploy>3.1.3</version.org.apache.maven.plugins.deploy>
-		<version.org.apache.maven.plugins.gpg>3.2.5</version.org.apache.maven.plugins.gpg>
+		<version.org.apache.maven.plugins.gpg>3.2.6</version.org.apache.maven.plugins.gpg>
 		<version.org.apache.maven.plugins.install>3.1.3</version.org.apache.maven.plugins.install>
 		<version.org.apache.maven.plugins.invoker>3.8.0</version.org.apache.maven.plugins.invoker>
 		<version.org.apache.maven.plugins.javadoc>3.10.0</version.org.apache.maven.plugins.javadoc>
@@ -264,6 +264,17 @@
 										</ignoreVersion>
 									</ignoreVersions>
 								</rule>
+								<!-- slf4j is provided by maven -->
+								<rule>
+									<groupId>org.slf4j</groupId>
+									<artifactId>slf4j-api</artifactId>
+									<ignoreVersions>
+										<ignoreVersion>
+											<type>regex</type>
+											<version>.*</version>
+										</ignoreVersion>
+									</ignoreVersions>
+								</rule>
 							</rules>
 						</ruleSet>
 					</configuration>