diff --git a/build.gradle b/build.gradle
index 155ffcc..16d7ada 100644
--- a/build.gradle
+++ b/build.gradle
@@ -42,7 +42,11 @@ dependencies {
 
     testImplementation "org.embulk:embulk-spi:0.11"
     testImplementation "org.msgpack:msgpack-core:0.8.24"
-    testImplementation "junit:junit:4.13.2"
+
+    testImplementation "org.junit.jupiter:junit-jupiter-api:5.9.3"
+    testImplementation "org.junit.jupiter:junit-jupiter-params:5.9.3"
+
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.9.3"
 }
 
 javadoc {
@@ -173,6 +177,7 @@ signing {
 }
 
 test {
+    useJUnitPlatform()
     testLogging {
         events "passed", "skipped", "failed", "standardOut", "standardError"
         exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
diff --git a/src/test/java/org/embulk/util/json/TestJsonParser.java b/src/test/java/org/embulk/util/json/TestJsonParser.java
index 8a9e7ec..19fcd4a 100644
--- a/src/test/java/org/embulk/util/json/TestJsonParser.java
+++ b/src/test/java/org/embulk/util/json/TestJsonParser.java
@@ -16,10 +16,11 @@
 
 package org.embulk.util.json;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;
@@ -27,7 +28,7 @@
 import java.util.Arrays;
 import java.util.Map;
 import java.util.stream.Collectors;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.msgpack.value.Value;
 import org.msgpack.value.ValueFactory;
 
@@ -41,10 +42,11 @@ public void testString() throws Exception {
         assertEquals("foobar", msgpackValue.asStringValue().toString());
     }
 
-    @Test(expected = JsonParseException.class)
     public void testStringUnquoted() throws Exception {
         final JsonParser parser = new JsonParser();
-        parser.parse("foobar");
+        assertThrows(JsonParseException.class, () -> {
+            parser.parse("foobar");
+        });
     }
 
     @Test