diff --git a/core/pom.xml b/core/pom.xml
index f0cdcb1a7b..5bc17aa1a9 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -128,8 +128,8 @@
         </dependency>
 
         <dependency>
-            <groupId>org.easymock</groupId>
-            <artifactId>easymock</artifactId>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
             <scope>test</scope>
         </dependency>
 
diff --git a/core/src/test/java/io/undertow/websockets/utils/TestUtils.java b/core/src/test/java/io/undertow/websockets/utils/TestUtils.java
deleted file mode 100644
index 4528f8822a..0000000000
--- a/core/src/test/java/io/undertow/websockets/utils/TestUtils.java
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * JBoss, Home of Professional Open Source.
- * Copyright 2014 Red Hat, Inc., and individual contributors
- * as indicated by the @author tags.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS,
- *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- */
-package io.undertow.websockets.utils;
-
-import static org.easymock.EasyMock.reset;
-import static org.easymock.EasyMock.verify;
-
-import java.nio.ByteBuffer;
-
-/**
- * An utility class which is used for testing
- *
- * @author norman
- */
-public final class TestUtils {
-
-    private TestUtils() {
-        // utility class
-    }
-
-    /**
-     * Return a array of bytes that holds all the readable data of the {@link ByteBuffer}. It will not increase the position
-     * of the given {@link ByteBuffer}
-     */
-    public static byte[] readableBytes(ByteBuffer buffer) {
-        byte[] readBytes = new byte[buffer.remaining()];
-        System.arraycopy(buffer.array(), buffer.arrayOffset() + buffer.position(), readBytes, 0, readBytes.length);
-        return readBytes;
-    }
-
-    /**
-     * Verify and reset the mocks which were created via {@link org.easymock.EasyMock}.
-     */
-    public static void verifyAndReset(Object... objects) {
-        verify(objects);
-        reset(objects);
-    }
-}
diff --git a/pom.xml b/pom.xml
index 94f013bad8..274c274edb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
             For example: <version.org.jboss.as.console>
          -->
         <version.com.h2database>2.1.214</version.com.h2database>
-        <version.easymock>4.3</version.easymock>
+        <version.mockito>5.11.0</version.mockito>
         <version.jakarta.annotation.jakarta-annotation-api>2.1.1</version.jakarta.annotation.jakarta-annotation-api>
         <version.jakarta.servlet.jakarta-servlet-api>6.0.0</version.jakarta.servlet.jakarta-servlet-api>
         <version.jakarta.websocket.jakarta-websocket-api>2.1.0</version.jakarta.websocket.jakarta-websocket-api>
@@ -397,9 +397,9 @@
             </dependency>
 
             <dependency>
-                <groupId>org.easymock</groupId>
-                <artifactId>easymock</artifactId>
-                <version>${version.easymock}</version>
+                <groupId>org.mockito</groupId>
+                <artifactId>mockito-core</artifactId>
+                <version>${version.mockito}</version>
                 <scope>test</scope>
             </dependency>