diff --git a/src/test/java/org/kohsuke/github/ArchTests.java b/src/test/java/org/kohsuke/github/ArchTests.java
index 6c70dcdf82..fceae8c316 100644
--- a/src/test/java/org/kohsuke/github/ArchTests.java
+++ b/src/test/java/org/kohsuke/github/ArchTests.java
@@ -37,6 +37,7 @@
 import static com.tngtech.archunit.core.domain.JavaCall.Predicates.target;
 import static com.tngtech.archunit.core.domain.JavaClass.Predicates.assignableTo;
 import static com.tngtech.archunit.core.domain.JavaClass.Predicates.resideInAPackage;
+import static com.tngtech.archunit.core.domain.JavaClass.Predicates.simpleNameContaining;
 import static com.tngtech.archunit.core.domain.JavaClass.Predicates.type;
 import static com.tngtech.archunit.core.domain.JavaMember.Predicates.declaredIn;
 import static com.tngtech.archunit.core.domain.JavaModifier.STATIC;
@@ -90,8 +91,6 @@ public boolean test(T input) {
         }
     }
 
-    private static final JavaClasses apacheCommons = new ClassFileImporter().importPackages("org.apache.commons.lang3");
-
     private static final JavaClasses classFiles = new ClassFileImporter()
             .withImportOption(new ImportOption.DoNotIncludeTests())
             .importPackages("org.kohsuke.github");
@@ -197,8 +196,6 @@ public static <T> DescribedPredicate<T> unless(DescribedPredicate<? super T> fir
         return new UnlessPredicate(first, second);
     }
 
-    private DescribedPredicate<JavaField> and;
-
     /**
      * Default constructor.
      */
@@ -227,12 +224,12 @@ public void testRequireFollowingNamingConvention() {
         var notStaticFinalFields = DescribedPredicate.<JavaField>not(modifier(STATIC).and(modifier(STATIC)));
         var notEnumOrStaticFinalFields = DescribedPredicate.<JavaField>and(not(enumConstants()), notStaticFinalFields);
 
-        final ArchRule instanceFieldsShouldNotBePublic = fields().that(notEnumOrStaticFinalFields)
-                .should(notHaveModifier(JavaModifier.PUBLIC))
+        final ArchRule instanceFieldsShouldNotBePublic = noFields().that(notEnumOrStaticFinalFields)
+                .should(haveModifier(JavaModifier.PUBLIC))
                 .because("This project does not allow public instance fields.");
 
         final ArchRule instanceFieldsShouldFollowConvention = noFields().that(notEnumOrStaticFinalFields)
-                .should(haveNamesContainingUnless("_"))
+                .should(have(nameContaining("_")))
                 .because("This project follows standard java naming conventions for fields.");
 
         @SuppressWarnings("AccessStaticViaInstance")
@@ -253,7 +250,7 @@ public void testRequireFollowingNamingConvention() {
                         declaredIn(GHRelease.class).and(name("getPublished_at"))))
                 .because(reason);
 
-        final ArchRule classesNotFollowingConvention = noClasses().should(haveNamesContainingUnless("_"))
+        final ArchRule classesNotFollowingConvention = noClasses().should(have(simpleNameContaining("_")))
                 .because(reason);
 
         enumsShouldFollowConvention.check(classFiles);