diff --git a/jackson/src/test/java/org/baeldung/jackson/date/CustomDateDeserializer.java b/jackson/src/test/java/org/baeldung/jackson/date/CustomDateDeserializer.java
index bbd039f6ae..eb1866026f 100644
--- a/jackson/src/test/java/org/baeldung/jackson/date/CustomDateDeserializer.java
+++ b/jackson/src/test/java/org/baeldung/jackson/date/CustomDateDeserializer.java
@@ -12,7 +12,7 @@ import com.fasterxml.jackson.databind.JsonDeserializer;
 
 public class CustomDateDeserializer extends JsonDeserializer<Date> {
 
-    private static SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
+    private SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
 
     @Override
     public Date deserialize(final JsonParser jsonparser, final DeserializationContext context) throws IOException, JsonProcessingException {
diff --git a/jackson/src/test/java/org/baeldung/jackson/date/CustomDateSerializer.java b/jackson/src/test/java/org/baeldung/jackson/date/CustomDateSerializer.java
index fc7cbb2db1..40aad21482 100644
--- a/jackson/src/test/java/org/baeldung/jackson/date/CustomDateSerializer.java
+++ b/jackson/src/test/java/org/baeldung/jackson/date/CustomDateSerializer.java
@@ -11,7 +11,7 @@ import com.fasterxml.jackson.databind.SerializerProvider;
 
 public class CustomDateSerializer extends JsonSerializer<Date> {
 
-    private static SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
+    private SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
 
     @Override
     public void serialize(final Date value, final JsonGenerator gen, final SerializerProvider arg2) throws IOException, JsonProcessingException {