diff --git a/ChangeLog.md b/ChangeLog.md
index 23d828c..71e62a9 100755
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -3,6 +3,12 @@ XML streams to objects
 
 ## ?.?.? / ????-??-??
 
+## 6.1.1 / 2024-03-29
+
+* Fixed "Implicitly marking parameter ... as nullable is deprecated"
+  warnings
+  (@thekid)
+
 ## 6.1.0 / 2024-03-24
 
 * Made compatible with XP 12 - @thekid
diff --git a/src/main/php/util/address/Iteration.class.php b/src/main/php/util/address/Iteration.class.php
index 2967e9b..f5bdf0b 100755
--- a/src/main/php/util/address/Iteration.class.php
+++ b/src/main/php/util/address/Iteration.class.php
@@ -26,10 +26,10 @@ public function path() { return $this->it->valid() ? $this->it->key() : null; }
   /**
    * Returns the next value according to the given definition.
    *
-   * @param  util.address.Definition $definition
+   * @param  ?util.address.Definition $definition
    * @return var
    */
-  public function next(Definition $definition= null) {
+  public function next($definition= null) {
     $this->tokens[]= $this->it->token;
 
     $value= null === $definition ? $this->it->current() : $this->it->value($definition, false);
diff --git a/src/main/php/util/address/Pointer.class.php b/src/main/php/util/address/Pointer.class.php
index 0f89ae0..3eec216 100755
--- a/src/main/php/util/address/Pointer.class.php
+++ b/src/main/php/util/address/Pointer.class.php
@@ -14,11 +14,11 @@ public function streaming() { return $this->streaming; }
   /**
    * Returns the current value according to the given definition
    *
-   * @param  util.address.Definition $definition
+   * @param  ?util.address.Definition $definition
    * @return var
    * @throws util.NoSuchElementException if there are no more elements
    */
-  public function value(Definition $definition= null) {
+  public function value($definition= null) {
     $it= $this->streaming->getIterator(true);
     return null === $definition ? $it->current() : $it->value($definition, $this->streaming, true);
   }
diff --git a/src/main/php/util/address/Streaming.class.php b/src/main/php/util/address/Streaming.class.php
index dc59b89..ae647ea 100755
--- a/src/main/php/util/address/Streaming.class.php
+++ b/src/main/php/util/address/Streaming.class.php
@@ -95,11 +95,11 @@ public function path() {
   /**
    * Returns the current value according to the given definition
    *
-   * @param  util.address.Definition $definition
+   * @param  ?util.address.Definition $definition
    * @return var
    * @throws util.NoSuchElementException if there are no more elements
    */
-  public function value(Definition $definition= null) {
+  public function value($definition= null) {
     $it= $this->getIterator(true);
     if ($it->valid()) {
       return null === $definition ? $it->current() : $it->value($definition, true);
@@ -111,11 +111,11 @@ public function value(Definition $definition= null) {
   /**
    * Returns the next value according to the given definition
    *
-   * @param  util.address.Definition $definition
+   * @param  ?util.address.Definition $definition
    * @return var
    * @throws util.NoSuchElementException if there are no more elements
    */
-  public function next(Definition $definition= null) {
+  public function next($definition= null) {
     $it= $this->getIterator(true);
     if ($it->valid()) {
       $value= null === $definition ? $it->current() : $it->value($definition, false);