diff --git a/.config/checkstyle/checkstyle.xml b/.config/checkstyle/checkstyle.xml
index dcc19b4..b585880 100644
--- a/.config/checkstyle/checkstyle.xml
+++ b/.config/checkstyle/checkstyle.xml
@@ -87,9 +87,7 @@
 		<module name="IllegalImport"/>
 		<module name="IllegalSymbol"/>
 		<module name="InterfaceIsType"/>
-		<module name="JavadocStyle">
-			<property name="checkFirstSentence" value="false"/>
-		</module>
+		<module name="JavadocContentLocation"/>
 		<module name="LeftCurly">
 			<!-- Default minus Lambda -->
 			<property name="tokens" value="ANNOTATION_DEF, CLASS_DEF, CTOR_DEF, ENUM_CONSTANT_DEF, ENUM_DEF, INTERFACE_DEF, LITERAL_CASE, LITERAL_CATCH, LITERAL_DEFAULT, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, METHOD_DEF, OBJBLOCK, STATIC_INIT, RECORD_DEF, COMPACT_CTOR_DEF"/>
diff --git a/.github/.lycheeignore b/.github/.lycheeignore
index dc88a07..217b0ae 100644
--- a/.github/.lycheeignore
+++ b/.github/.lycheeignore
@@ -1,3 +1,4 @@
 # Ignorefile for broken link check
 localhost
 mvnrepository.com
+stackoverflow.com
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d83b8cf..55fa7ce 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,7 +12,7 @@ We would absolutely love to get the community involved, and we welcome any form
 * **Send pull requests**<br/>If you want to contribute code, check out the development instructions below.
   * However when contributing larger new features, please first discuss the change you wish to make via issue with the owners of this repository before making it.<br/>Otherwise your work might be rejected and your effort was pointless.
 
-We also encourage you to read the [contribution instructions by GitHub](https://docs.github.com/en/get-started/quickstart/contributing-to-projects).
+We also encourage you to read the [contribution instructions by GitHub](https://docs.github.com/en/get-started/exploring-projects-on-github/contributing-to-a-project).
 
 ## Developing
 
@@ -20,7 +20,7 @@ We also encourage you to read the [contribution instructions by GitHub](https://
 You should have the following things installed:
 * Git
 * Java 25 - should be as unmodified as possible (Recommended: [Eclipse Adoptium](https://adoptium.net/temurin/releases/))
-* Maven (Note that the [Maven Wrapper](https://maven.apache.org/wrapper/) is shipped with the repo)
+* Maven (Note that the [Maven Wrapper](https://maven.apache.org/tools/wrapper/) is shipped with the repo)
 
 ### Recommended setup
 * Install `IntelliJ`
diff --git a/README.md b/README.md
index c9250bd..84a831a 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ You can find out how the generated API might be used by having a look at [the te
 [Installation guide for the latest release](https://github.com/xdev-software/mailpit-java-client/releases/latest#Installation)
 
 ## Support
-If you need support as soon as possible and you can't wait for any pull request, feel free to use [our support](https://xdev.software/en/services/support).
+If you need support as soon as possible and you can't wait for any pull request, feel free to use [our support](https://xdev.software/en/services-products/support).
 
 ## Contributing
 See the [contributing guide](./CONTRIBUTING.md) for detailed instructions on how to get started with our project.
diff --git a/mailpit-java-client/pom.xml b/mailpit-java-client/pom.xml
index 2796c10..e94d91b 100644
--- a/mailpit-java-client/pom.xml
+++ b/mailpit-java-client/pom.xml
@@ -515,7 +515,7 @@
 							<dependency>
 								<groupId>com.puppycrawl.tools</groupId>
 								<artifactId>checkstyle</artifactId>
-								<version>13.8.0</version>
+								<version>13.9.0</version>
 							</dependency>
 						</dependencies>
 						<configuration>
diff --git a/pom.xml b/pom.xml
index 399abe2..23cf1cc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
 							<dependency>
 								<groupId>com.puppycrawl.tools</groupId>
 								<artifactId>checkstyle</artifactId>
-								<version>13.8.0</version>
+								<version>13.9.0</version>
 							</dependency>
 						</dependencies>
 						<configuration>