diff --git a/core/src/main/java/hudson/model/WorkspaceCleanupThread.java b/core/src/main/java/hudson/model/WorkspaceCleanupThread.java
index d17970bb6a..8159f1f20c 100644
--- a/core/src/main/java/hudson/model/WorkspaceCleanupThread.java
+++ b/core/src/main/java/hudson/model/WorkspaceCleanupThread.java
@@ -143,7 +143,7 @@ public class WorkspaceCleanupThread extends AsyncPeriodicWork {
 
         private final int retentionInDays;
 
-        public CleanupOldWorkspaces(int retentionInDays) {
+        CleanupOldWorkspaces(int retentionInDays) {
             this.retentionInDays = retentionInDays;
         }
 
@@ -171,7 +171,7 @@ public class WorkspaceCleanupThread extends AsyncPeriodicWork {
 
         private final String workspaceBaseName;
 
-        public ShouldBeDeletedFilter(int retentionInDays, String workspaceBaseName) {
+        ShouldBeDeletedFilter(int retentionInDays, String workspaceBaseName) {
             this.retentionInDays = retentionInDays;
             this.workspaceBaseName = workspaceBaseName;
         }
diff --git a/pom.xml b/pom.xml
index d9bada07b6..22f5f8c138 100644
--- a/pom.xml
+++ b/pom.xml
@@ -282,7 +282,7 @@ THE SOFTWARE.
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>10.15.0</version>
+              <version>10.16.0</version>
             </dependency>
           </dependencies>
           <executions>