diff --git a/composer.json b/composer.json
index a6cc9e4..72618c9 100755
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
   "description" : "Reads and writes JSON to and from various input sources",
   "keywords": ["module", "xp"],
   "require" : {
-    "xp-framework/core": "^12.0 | ^11.0 | ^10.0",
+    "xp-framework/core": "^12.11 | ^11.11",
     "php" : ">=7.4.0"
   },
   "require-dev" : {
diff --git a/src/main/php/text/json/MultiByteSource.class.php b/src/main/php/text/json/MultiByteSource.class.php
index ac2bfbd..fd89975 100755
--- a/src/main/php/text/json/MultiByteSource.class.php
+++ b/src/main/php/text/json/MultiByteSource.class.php
@@ -1,6 +1,6 @@
 <?php namespace text\json;
 
-use io\IOException;
+use io\NotSupported;
 use io\streams\{InputStream, Seekable, Streams};
 
 class MultiByteSource implements InputStream, Seekable {
@@ -39,7 +39,7 @@ public function seek($offset, $whence= SEEK_SET) {
     if ($this->in instanceof Seekable) {
       $this->in->seek($offset, $whence);
     } else {
-      throw new IOException('Cannot seek '.$this->in->toString());
+      throw new NotSupported('Cannot seek '.$this->in->toString());
     }
   }
 
diff --git a/src/main/php/text/json/StreamInput.class.php b/src/main/php/text/json/StreamInput.class.php
index b9d54f4..51b7374 100755
--- a/src/main/php/text/json/StreamInput.class.php
+++ b/src/main/php/text/json/StreamInput.class.php
@@ -1,6 +1,6 @@
 <?php namespace text\json;
 
-use io\IOException;
+use io\NotSupported;
 use io\streams\{InputStream, Seekable};
 use lang\FormatException;
 
@@ -79,7 +79,7 @@ public function __construct(InputStream $in, $encoding= \xp::ENCODING, $maximumN
    * Resets input
    *
    * @return void
-   * @throws io.IOException If this input cannot be reset
+   * @throws io.NotSupported If this input cannot be reset
    */
   public function reset() {
     if ($this->in instanceof Seekable) {
@@ -89,7 +89,7 @@ public function reset() {
       $this->pos= 0;
       $this->firstToken= null;
     } else {
-      throw new IOException('Cannot seek streams of type '.typeof($this->in)->getName());
+      throw new NotSupported('Cannot seek streams of type '.typeof($this->in)->getName());
     }
   }
 
diff --git a/src/test/php/text/json/unittest/StreamInputTest.class.php b/src/test/php/text/json/unittest/StreamInputTest.class.php
index 9a3de36..4f30a5b 100755
--- a/src/test/php/text/json/unittest/StreamInputTest.class.php
+++ b/src/test/php/text/json/unittest/StreamInputTest.class.php
@@ -1,6 +1,6 @@
 <?php namespace text\json\unittest;
 
-use io\IOException;
+use io\NotSupported;
 use io\streams\{InputStream, MemoryInputStream};
 use test\{Assert, Test, Values};
 use text\json\StreamInput;
@@ -76,7 +76,7 @@ public function available() { return true; }
       public function close() { }
     });
     Assert::equals([1], iterator_to_array($input->elements()), '#1');
-    Assert::throws(IOException::class, function() use($input) {
+    Assert::throws(NotSupported::class, function() use($input) {
       $input->reset();
       iterator_to_array($input->elements());
     });