diff --git a/src/test/java/tools/jackson/core/Base64VariantTest.java b/src/test/java/tools/jackson/core/Base64VariantTest.java
index e24e3f1a57..0c93921b2a 100644
--- a/src/test/java/tools/jackson/core/Base64VariantTest.java
+++ b/src/test/java/tools/jackson/core/Base64VariantTest.java
@@ -1,6 +1,6 @@
 package tools.jackson.core;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import tools.jackson.core.util.BufferRecycler;
 import tools.jackson.core.util.ByteArrayBuilder;
diff --git a/src/test/java/tools/jackson/core/util/ByteArrayBuilderTest.java b/src/test/java/tools/jackson/core/util/ByteArrayBuilderTest.java
index f84029ce73..e32529a561 100644
--- a/src/test/java/tools/jackson/core/util/ByteArrayBuilderTest.java
+++ b/src/test/java/tools/jackson/core/util/ByteArrayBuilderTest.java
@@ -2,8 +2,6 @@
 
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Assert;
-
 import tools.jackson.core.*;
 import tools.jackson.core.base.GeneratorBase;
 import tools.jackson.core.io.IOContext;
@@ -16,7 +14,7 @@ public class ByteArrayBuilderTest extends JUnit5TestBase
     public void testSimple() throws Exception
     {
         ByteArrayBuilder b = new ByteArrayBuilder(null, 20);
-        Assert.assertArrayEquals(new byte[0], b.toByteArray());
+        assertArrayEquals(new byte[0], b.toByteArray());
 
         b.write((byte) 0);
         b.append(1);