diff --git a/abstract-document/pom.xml b/abstract-document/pom.xml
index bdcdd170a43a..c3f783184d33 100644
--- a/abstract-document/pom.xml
+++ b/abstract-document/pom.xml
@@ -29,7 +29,7 @@
java-design-patterns
com.iluwatar
- 1.21.0-SNAPSHOT
+ 1.22.0-SNAPSHOT
abstract-document
diff --git a/abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java b/abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java
index 36a946cc9eca..fccc23d83b7b 100644
--- a/abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java
+++ b/abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java
@@ -54,17 +54,16 @@ public Object get(String key) {
@Override
public Stream children(String key, Function