diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c267f7ac..76f18b3b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -12,9 +12,14 @@ The format of this *Change Log* is inspired by `keeapachangelog.org`_.
 
 `X.Y.Z`_ @ 2021
 ---------------
-.. _`X.Y.Z`: https://github.com/apalala/tatsu/compare/v5.6.0...master
+.. _`X.Y.Z`: https://github.com/apalala/tatsu/compare/v5.6.1...master
 
 
+`5.6.1`_ @ 2021-03-22
+---------------------
+.. _`5.6.0`: https://github.com/apalala/tatsu/compare/v5.6.0...v5.6.1
+
+*   Fix bug in which rule fields were forced on empty ``AST`` (`@Victorious3`_)
 
 `5.6.0`_ @ 2021-03-21
 ---------------------
@@ -68,7 +73,7 @@ The format of this *Change Log* is inspired by `keeapachangelog.org`_.
 *   Allow empty patterns (``//``) like Python does
 *  `#65`_ Allow initial, consecutive, and trailing ``@namechars``
 *  `#73`_ Allow ``@@whitespace :: None`` and ``@@whitespace :: False``
-*  `#75`_ Complete implemenation of left recursion(`@Victorious3`_)
+*  `#75`_ Complete implemenation of left recursion (`@Victorious3`_)
 *  `#77`_ Allow ``@keyword`` throughout the grammar
 *  `#89`_ Make all attributes defined in the rule present in the resulting ``AST`` or ``Node`` even if the associated expression was not parsed
 *  `#93`_ Fix trace colorization on Windows
diff --git a/README.md b/README.md
index 7586a6ba..8e605b82 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,8 @@
 ``` python
 def WARNING():
     """
-    TatSu==5.6.0 requires Python>=3.8
-    TatSu>=5.7.0 will require Python>=3.9
+    TatSu>=5.6 requires Python>=3.8
+    TatSu>=5.7 will require Python>=3.9
 
     Python 3.8 and 3.9 introduced new language features that allow
     writing better programs more clearly. All code written for
diff --git a/README.rst b/README.rst
index 7005977b..781a45f2 100644
--- a/README.rst
+++ b/README.rst
@@ -22,8 +22,8 @@
 
     def WARNING():
         """
-        TatSu==5.6.0 requires Python>=3.8
-        TatSu>=5.7.0 will require Python>=3.9
+        TatSu>=5.6 requires Python>=3.8
+        TatSu>=5.7 will require Python>=3.9
 
         Python 3.8 and 3.9 introduced new language features that allow
         writing better programs more clearly. All code written for
diff --git a/tatsu/_config.py b/tatsu/_config.py
index 02abfecc..b7c1ad46 100644
--- a/tatsu/_config.py
+++ b/tatsu/_config.py
@@ -1,2 +1,2 @@
 __toolname__ = 'TatSu'
-__version__ = '5.6.0'
+__version__ = '5.6.1'
diff --git a/tatsu/collections/orderedset.py b/tatsu/collections/orderedset.py
index 2c13584c..dd5a10fa 100644
--- a/tatsu/collections/orderedset.py
+++ b/tatsu/collections/orderedset.py
@@ -22,7 +22,7 @@ def __init__(self, iterable: Optional[Iterable[T]] = None):
             self._map = dict.fromkeys(iterable)  # type: Dict[T, int]
         else:
             self._map = {}
-        self._list_cache: Optional[list[T]] = None
+        self._list_cache: Optional[Sequence[T]] = None
 
     def __len__(self):
         return len(self._map)