diff --git a/jackson-modules/jackson-custom-conversions/pom.xml b/jackson-modules/jackson-custom-conversions/pom.xml
index c319891da9..78894bb403 100644
--- a/jackson-modules/jackson-custom-conversions/pom.xml
+++ b/jackson-modules/jackson-custom-conversions/pom.xml
@@ -23,6 +23,13 @@
             <artifactId>jackson-datatype-joda</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>2.10.1</version>
+        </dependency>
+
+
     </dependencies>
 
     <build>
diff --git a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/deserialization/CustomDeserializationUnitTest.java b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/deserialization/CustomDeserializationUnitTest.java
index f2a2502c3e..17016149a2 100644
--- a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/deserialization/CustomDeserializationUnitTest.java
+++ b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/deserialization/CustomDeserializationUnitTest.java
@@ -60,8 +60,6 @@ public class CustomDeserializationUnitTest {
         String converted = objectMapper.writeValueAsString(now);
         // restore an instance of ZonedDateTime from String
         ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class);
-        System.out.println("serialized: " + now);
-        System.out.println("restored: " + restored);
         assertThat(now, is(not(restored)));
     }
 
@@ -70,15 +68,14 @@ public class CustomDeserializationUnitTest {
         ObjectMapper objectMapper = new ObjectMapper();
         objectMapper.findAndRegisterModules();
         objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+        objectMapper.enable(SerializationFeature.WRITE_DATES_WITH_ZONE_ID);
         objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);
         // construct a new instance of ZonedDateTime
         ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Europe/Berlin"));
         String converted = objectMapper.writeValueAsString(now);
         // restore an instance of ZonedDateTime from String
         ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class);
-        System.out.println("serialized: " + now);
-        System.out.println("restored: " + restored);
-        assertThat(now, is(restored));
+        assertThat(restored, is(now));
     }
 
 }
diff --git a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/serialization/CustomSerializationUnitTest.java b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/serialization/CustomSerializationUnitTest.java
index 6cb4019fa2..9c46a86fd8 100644
--- a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/serialization/CustomSerializationUnitTest.java
+++ b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/serialization/CustomSerializationUnitTest.java
@@ -24,7 +24,6 @@ public class CustomSerializationUnitTest {
     public final void whenSerializing_thenNoExceptions() throws JsonGenerationException, JsonMappingException, IOException {
         final Item myItem = new Item(1, "theItem", new User(2, "theUser"));
         final String serialized = new ObjectMapper().writeValueAsString(myItem);
-        System.out.println(serialized);
     }
 
     @Test
@@ -38,7 +37,6 @@ public class CustomSerializationUnitTest {
         mapper.registerModule(simpleModule);
 
         final String serialized = mapper.writeValueAsString(myItem);
-        System.out.println(serialized);
     }
 
     @Test
@@ -46,7 +44,6 @@ public class CustomSerializationUnitTest {
         final ItemWithSerializer myItem = new ItemWithSerializer(1, "theItem", new User(2, "theUser"));
 
         final String serialized = new ObjectMapper().writeValueAsString(myItem);
-        System.out.println(serialized);
     }
 
 }
diff --git a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/IgnoreFieldsWithFilterUnitTest.java b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/IgnoreFieldsWithFilterUnitTest.java
index e71f31bc6a..ec753019b2 100644
--- a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/IgnoreFieldsWithFilterUnitTest.java
+++ b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/IgnoreFieldsWithFilterUnitTest.java
@@ -37,7 +37,6 @@ public class IgnoreFieldsWithFilterUnitTest {
         assertThat(dtoAsString, not(containsString("intValue")));
         assertThat(dtoAsString, containsString("booleanValue"));
         assertThat(dtoAsString, containsString("stringValue"));
-        System.out.println(dtoAsString);
     }
 
     @Test
@@ -83,7 +82,6 @@ public class IgnoreFieldsWithFilterUnitTest {
         assertThat(dtoAsString, not(containsString("intValue")));
         assertThat(dtoAsString, containsString("booleanValue"));
         assertThat(dtoAsString, containsString("stringValue"));
-        System.out.println(dtoAsString);
     }
 
 }
diff --git a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/JacksonDynamicIgnoreUnitTest.java b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/JacksonDynamicIgnoreUnitTest.java
index 6ba14f7476..2fd59e2a82 100644
--- a/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/JacksonDynamicIgnoreUnitTest.java
+++ b/jackson-modules/jackson-custom-conversions/src/test/java/com/baeldung/skipfields/JacksonDynamicIgnoreUnitTest.java
@@ -51,8 +51,6 @@ public class JacksonDynamicIgnoreUnitTest {
         assertTrue(result.contains("john"));
         assertTrue(result.contains("address"));
         assertTrue(result.contains("usa"));
-
-        System.out.println("Not Hidden = " + result);
     }
 
     @Test
@@ -65,8 +63,6 @@ public class JacksonDynamicIgnoreUnitTest {
         assertTrue(result.contains("john"));
         assertFalse(result.contains("address"));
         assertFalse(result.contains("usa"));
-
-        System.out.println("Address Hidden = " + result);
     }
 
     @Test
@@ -76,8 +72,6 @@ public class JacksonDynamicIgnoreUnitTest {
         final String result = mapper.writeValueAsString(person);
 
         assertTrue(result.length() == 0);
-
-        System.out.println("All Hidden = " + result);
     }
 
     @Test
@@ -90,7 +84,5 @@ public class JacksonDynamicIgnoreUnitTest {
         final Person p3 = new Person("adam", ad3, false);
 
         final String result = mapper.writeValueAsString(Arrays.asList(p1, p2, p3));
-
-        System.out.println(result);
     }
 }