diff --git a/core-java-8/pom.xml b/core-java-8/pom.xml
index 33585a5667..7968c26810 100644
--- a/core-java-8/pom.xml
+++ b/core-java-8/pom.xml
@@ -14,7 +14,7 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>16.0.1</version>
+			<version>17.0</version>
 		</dependency>
 
 		<dependency>
@@ -26,7 +26,7 @@
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-lang3</artifactId>
-			<version>3.1</version>
+			<version>3.3.2</version>
 		</dependency>
 
 		<!-- web -->
@@ -111,35 +111,34 @@
 		<mysql-connector-java.version>5.1.27</mysql-connector-java.version>
 
 		<!-- marshalling -->
-		<jackson.version>2.3.0</jackson.version>
+		<jackson.version>2.4.0</jackson.version>
 
 		<!-- logging -->
 		<org.slf4j.version>1.7.5</org.slf4j.version>
 		<logback.version>1.0.11</logback.version>
 
 		<!-- various -->
-		<hibernate-validator.version>5.0.1.Final</hibernate-validator.version>
+		<hibernate-validator.version>5.1.1.Final</hibernate-validator.version>
 
 		<!-- util -->
-		<guava.version>15.0</guava.version>
-		<commons-lang3.version>3.1</commons-lang3.version>
+		<guava.version>17.0</guava.version>
+		<commons-lang3.version>3.3.2</commons-lang3.version>
 
 		<!-- testing -->
 		<org.hamcrest.version>1.3</org.hamcrest.version>
 		<junit.version>4.11</junit.version>
 		<mockito.version>1.9.5</mockito.version>
 
-		<httpcore.version>4.3</httpcore.version>
-		<httpclient.version>4.3.1</httpclient.version>
+		<httpcore.version>4.3.2</httpcore.version>
+		<httpclient.version>4.3.4</httpclient.version>
 
-		<rest-assured.version>2.1.0</rest-assured.version>
+		<rest-assured.version>2.3.2</rest-assured.version>
 
 		<!-- maven plugins -->
 		<maven-compiler-plugin.version>3.1</maven-compiler-plugin.version>
 		<maven-war-plugin.version>2.4</maven-war-plugin.version>
-		<maven-surefire-plugin.version>2.16</maven-surefire-plugin.version>
+		<maven-surefire-plugin.version>2.17</maven-surefire-plugin.version>
 		<maven-resources-plugin.version>2.6</maven-resources-plugin.version>
-		<cargo-maven2-plugin.version>1.4.5</cargo-maven2-plugin.version>
 
 	</properties>
 
diff --git a/core-java-8/src/test/java/org/baeldung/java8/Java8CollectionCleanupUnitTest.java b/core-java-8/src/test/java/org/baeldung/java8/Java8CollectionCleanupUnitTest.java
new file mode 100644
index 0000000000..acca829b78
--- /dev/null
+++ b/core-java-8/src/test/java/org/baeldung/java8/Java8CollectionCleanupUnitTest.java
@@ -0,0 +1,41 @@
+package org.baeldung.java8;
+
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+
+public class Java8CollectionCleanupUnitTest {
+
+    // tests -
+
+    @Test
+    public void givenListContainsNulls_whenFilteringParallel_thenCorrect() {
+        final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
+        final List<Integer> listWithoutNulls = list.parallelStream().filter(i -> i != null).collect(Collectors.toList());
+
+        assertThat(listWithoutNulls, hasSize(3));
+    }
+
+    @Test
+    public void givenListContainsNulls_whenFilteringSerial_thenCorrect() {
+        final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
+        final List<Integer> listWithoutNulls = list.stream().filter(i -> i != null).collect(Collectors.toList());
+
+        assertThat(listWithoutNulls, hasSize(3));
+    }
+
+    @Test
+    public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
+        final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
+        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream().distinct().collect(Collectors.toList());
+
+        assertThat(listWithoutDuplicates, hasSize(3));
+    }
+
+}
diff --git a/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java b/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
index 5398198a7b..f6b89dd4c9 100644
--- a/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
+++ b/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
@@ -1,6 +1,5 @@
 package org.baeldung.java8;
 
-import static org.baeldung.java8.entity.Human.compareByNameThenAge;
 import static org.hamcrest.Matchers.equalTo;
 
 import java.util.Collections;