diff --git a/pom.xml b/pom.xml
index 751bedd..53eb0d4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
     <dependency>
       <groupId>com.puppycrawl.tools</groupId>
       <artifactId>checkstyle</artifactId>
-      <version>6.16.1</version>
+      <version>8.18</version>
     </dependency>
 
     <dependency>
diff --git a/src/main/java/io/netty/build/checkstyle/NewlineCheck.java b/src/main/java/io/netty/build/checkstyle/NewlineCheck.java
index 8e793be..784b7f1 100644
--- a/src/main/java/io/netty/build/checkstyle/NewlineCheck.java
+++ b/src/main/java/io/netty/build/checkstyle/NewlineCheck.java
@@ -20,7 +20,6 @@ import com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck;
 import com.puppycrawl.tools.checkstyle.api.FileText;
 
 import java.io.File;
-import java.util.List;
 import java.util.regex.Pattern;
 
 public class NewlineCheck extends AbstractFileSetCheck {
@@ -57,8 +56,8 @@ public class NewlineCheck extends AbstractFileSetCheck {
     }
 
     @Override
-    protected void processFiltered(File aFile, List<String> aLines) {
-        String text = FileText.fromLines(aFile, aLines).getFullText().toString();
+    protected void processFiltered(File file, FileText fileText) {
+        String text = fileText.getFullText().toString();
 
         switch (NEWLINE_TYPE) {
         case LF:
diff --git a/src/main/java/io/netty/build/checkstyle/SuppressionFilter.java b/src/main/java/io/netty/build/checkstyle/SuppressionFilter.java
index 74998f1..17e2329 100644
--- a/src/main/java/io/netty/build/checkstyle/SuppressionFilter.java
+++ b/src/main/java/io/netty/build/checkstyle/SuppressionFilter.java
@@ -17,6 +17,7 @@ package io.netty.build.checkstyle;
 
 import com.puppycrawl.tools.checkstyle.api.AuditEvent;
 import com.puppycrawl.tools.checkstyle.api.AutomaticBean;
+import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
 import com.puppycrawl.tools.checkstyle.api.Filter;
 
 import java.util.regex.Pattern;
@@ -58,4 +59,9 @@ public class SuppressionFilter extends AutomaticBean implements Filter {
         }
         return true;
     }
+
+    @Override
+    protected void finishLocalSetup() {
+        // NOOP.
+    }
 }