diff --git a/CHANGES b/CHANGES
index 2a353d9..26ba11d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,13 @@ Changes
 Here you can see the full list of changes between each Flask-IIIF
 release.
 
+Version 1.0.0 (released 2023-10-27)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+- api: fix resize of greyscale source images
+- bump flask to >=2.0, pin Werkzeug <3.0
+- fix deprecated use of ``attachment_filename``
+
 Version 0.6.3 (released 2022-07-08)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/flask_iiif/__init__.py b/flask_iiif/__init__.py
index 55d73d6..ab0fb1f 100644
--- a/flask_iiif/__init__.py
+++ b/flask_iiif/__init__.py
@@ -166,7 +166,7 @@ def protect_api():
         self.api_decorator_callback = callback
 
 
-__version__ = "0.6.3"
+__version__ = "1.0.0"
 
 __all__ = (
     "IIIF",