diff --git a/core-java-modules/core-java-datetime-string/pom.xml b/core-java-modules/core-java-datetime-string/pom.xml
index a33114852c..292a38a5af 100644
--- a/core-java-modules/core-java-datetime-string/pom.xml
+++ b/core-java-modules/core-java-datetime-string/pom.xml
@@ -64,7 +64,7 @@
     </build>
 
     <properties>
-        <commons-validator.version>1.6</commons-validator.version>
+        <commons-validator.version>1.7</commons-validator.version>
         <joda-time.version>2.12.5</joda-time.version>
         <hirondelle-date4j.version>RELEASE</hirondelle-date4j.version>
         <maven.compiler.source>1.9</maven.compiler.source>
diff --git a/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java b/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java
index ef273e4b81..1466fece46 100644
--- a/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java
+++ b/core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java
@@ -6,6 +6,7 @@ import java.time.Instant;
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
 import java.time.temporal.UnsupportedTemporalTypeException;
+import java.util.TimeZone;
 
 import org.joda.time.format.DateTimeFormat;
 import org.junit.Test;
@@ -17,7 +18,7 @@ public class FormatInstantUnitTest {
     @Test
     public void givenInstant_whenUsingDateTimeFormatter_thenFormat() {
         DateTimeFormatter formatter = DateTimeFormatter.ofPattern(PATTERN_FORMAT)
-            .withZone(ZoneId.systemDefault());
+            .withZone(TimeZone.getTimeZone("UTC").toZoneId());
 
         Instant instant = Instant.parse("2022-02-15T18:35:24.00Z");
         String formattedInstant = formatter.format(instant);