diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 6c24c01bfa..584edc6a20 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -9,6 +9,7 @@
         <outputRelativeToContentRoot value="true" />
         <module name="codebank" />
         <module name="core-java-collections-list" />
+        <module name="core-java-io" />
         <module name="core-java-datetime-conversion" />
         <module name="core-java-annotations" />
         <module name="core-java-8" />
@@ -57,7 +58,6 @@
       <module name="core-java-exceptions-4" target="1.8" />
       <module name="core-java-function" target="1.8" />
       <module name="core-java-functional" target="1.8" />
-      <module name="core-java-io" target="1.8" />
       <module name="core-java-io-2" target="1.8" />
       <module name="core-java-io-3" target="1.8" />
       <module name="core-java-io-4" target="1.8" />
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
index 7028930c57..789cc552fc 100644
--- a/.idea/encodings.xml
+++ b/.idea/encodings.xml
@@ -9,6 +9,8 @@
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-collections-list/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-datetime-conversion/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/core-java-datetime-conversion/src/main/resources" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/core-java-modules/core-java-io/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/core-java-modules/core-java-io/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/core-java-modules/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/jackson-modules/jackson-annotations/src/main/java" charset="UTF-8" />
diff --git a/core-java-modules/core-java-io/pom.xml b/core-java-modules/core-java-io/pom.xml
index 19aa11fa15..31937ff946 100644
--- a/core-java-modules/core-java-io/pom.xml
+++ b/core-java-modules/core-java-io/pom.xml
@@ -209,8 +209,7 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>${maven-javadoc-plugin.version}</version>
                 <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
+                    <source>11</source>
                 </configuration>
             </plugin>
 
@@ -287,7 +286,7 @@
         <avaitility.version>1.7.0</avaitility.version>
 
         <!-- maven plugins -->
-        <maven-javadoc-plugin.version>3.3.1</maven-javadoc-plugin.version>
+        <maven-javadoc-plugin.version>3.3.2</maven-javadoc-plugin.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <esapi.version>2.3.0.0</esapi.version>
         <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
diff --git a/core-java-modules/core-java-io/src/test/java/com/ossez/java8/JavaFolderSizeUnitTest.java b/core-java-modules/core-java-io/src/test/java/com/ossez/java8/JavaFolderSizeUnitTest.java
index 67c175401e..c3b429a37f 100644
--- a/core-java-modules/core-java-io/src/test/java/com/ossez/java8/JavaFolderSizeUnitTest.java
+++ b/core-java-modules/core-java-io/src/test/java/com/ossez/java8/JavaFolderSizeUnitTest.java
@@ -72,7 +72,7 @@ public class JavaFolderSizeUnitTest {
     public void whenGetFolderSizeUsingGuava_thenCorrect() {
         final File folder = new File(path);
 
-        final Iterable<File> files = com.google.common.io.Files.fileTreeTraverser().breadthFirstTraversal(folder);
+        final Iterable<File> files = com.google.common.io.Files.fileTraverser().breadthFirst(folder);
         final long size = StreamSupport.stream(files.spliterator(), false).filter(File::isFile).mapToLong(File::length).sum();
 
         assertEquals(EXPECTED_SIZE, size);
diff --git a/core-java-modules/pom.xml b/core-java-modules/pom.xml
index dcd87b8c37..42616c6f5a 100644
--- a/core-java-modules/pom.xml
+++ b/core-java-modules/pom.xml
@@ -19,7 +19,7 @@
         <module>core-java-annotations</module>
         <module>core-java-collections-list</module>
         <module>core-java-datetime-conversion</module>
-        <!--        <module>core-java-io</module>-->
+        <module>core-java-io</module>
     </modules>
 
     <dependencyManagement>