diff --git a/core-java-modules/core-java-io/src/test/java/com/baeldung/size/JavaFolderSizeUnitTest.java b/core-java-modules/core-java-io/src/test/java/com/baeldung/size/JavaFolderSizeUnitTest.java
index 467da4f76a..7fd7641a61 100644
--- a/core-java-modules/core-java-io/src/test/java/com/baeldung/size/JavaFolderSizeUnitTest.java
+++ b/core-java-modules/core-java-io/src/test/java/com/baeldung/size/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/guava-collections/src/test/java/com/baeldung/guava/joinsplit/GuavaStringUnitTest.java b/guava-collections/src/test/java/com/baeldung/guava/joinsplit/GuavaStringUnitTest.java
index 73c4c3291e..0c480d02a0 100644
--- a/guava-collections/src/test/java/com/baeldung/guava/joinsplit/GuavaStringUnitTest.java
+++ b/guava-collections/src/test/java/com/baeldung/guava/joinsplit/GuavaStringUnitTest.java
@@ -117,7 +117,7 @@ public class GuavaStringUnitTest {
     @Test
     public void whenRemoveSpecialCharacters_thenRemoved() {
         final String input = "H*el.lo,}12";
-        final CharMatcher matcher = CharMatcher.JAVA_LETTER_OR_DIGIT;
+        final CharMatcher matcher = CharMatcher.javaLetterOrDigit();
         final String result = matcher.retainFrom(input);
 
         assertEquals("Hello12", result);
@@ -127,7 +127,7 @@ public class GuavaStringUnitTest {
     public void whenRemoveNonASCIIChars_thenRemoved() {
         final String input = "あhello₤";
 
-        String result = CharMatcher.ASCII.retainFrom(input);
+        String result = CharMatcher.ascii().retainFrom(input);
         assertEquals("hello", result);
 
         result = CharMatcher.inRange('0', 'z').retainFrom(input);
@@ -138,13 +138,13 @@ public class GuavaStringUnitTest {
     public void whenValidateString_thenValid() {
         final String input = "hello";
 
-        boolean result = CharMatcher.JAVA_LOWER_CASE.matchesAllOf(input);
+        boolean result = CharMatcher.javaLowerCase().matchesAllOf(input);
         assertTrue(result);
 
         result = CharMatcher.is('e').matchesAnyOf(input);
         assertTrue(result);
 
-        result = CharMatcher.JAVA_DIGIT.matchesNoneOf(input);
+        result = CharMatcher.javaDigit().matchesNoneOf(input);
         assertTrue(result);
     }
 
diff --git a/parent-java/pom.xml b/parent-java/pom.xml
index f56ffbd7f7..d251adcdd3 100644
--- a/parent-java/pom.xml
+++ b/parent-java/pom.xml
@@ -42,7 +42,7 @@
     </dependencies>
 
     <properties>
-        <guava.version>23.0</guava.version>
+        <guava.version>29.0-jre</guava.version>
         <commons.io.version>2.6</commons.io.version>
         <jmh.version>1.19</jmh.version>
         <modelmapper.version>2.3.7</modelmapper.version>