diff --git a/app.py b/app.py
index 3929f5a..72ef7ad 100644
--- a/app.py
+++ b/app.py
@@ -20,7 +20,7 @@
 
 __major_version__ = "0"
 __minor_version__ = "2"
-__change_version__ = "5"
+__change_version__ = "6"
 __version__ = ".".join(
     (__major_version__, __minor_version__, __change_version__)
 )
@@ -41,7 +41,7 @@
     __application_name__,
     external_scripts=os.environ.get("COLOUR_DASH_JS", "").split(","),
     external_stylesheets=os.environ.get("COLOUR_DASH_CSS", "").split(","),
-    server=SERVER,
+    server=SERVER,  # pyright: ignore
 )
 """
 *Dash* app.
diff --git a/apps/rgb_colourspace_transformation_matrix.py b/apps/rgb_colourspace_transformation_matrix.py
index f6c85cd..10ced94 100644
--- a/apps/rgb_colourspace_transformation_matrix.py
+++ b/apps/rgb_colourspace_transformation_matrix.py
@@ -245,7 +245,7 @@ def _uid(id_):
 def set_RGB_to_RGB_matrix_output(
     input_colourspace: str,
     output_colourspace: str,
-    chromatic_adaptation_transform: str,
+    chromatic_adaptation_transform: str | None,
     formatter: str,
     decimals: int,
 ) -> str:
diff --git a/index.py b/index.py
index 774044d..7006ed9 100644
--- a/index.py
+++ b/index.py
@@ -3,6 +3,7 @@
 =====
 """
 
+import dash
 from dash.dependencies import Input, Output
 from dash.dcc import Link, Location, Markdown
 from dash.html import A, Div, H3, P
@@ -24,7 +25,7 @@
 
 
 @APP.callback(Output("apps", "children"), [Input("url", "pathname")])
-def load_app(app: APP):
+def load_app(app: dash.Dash):
     """
     Load given app into the appropriate :class:`Div` class instance.
 
diff --git a/pyproject.toml b/pyproject.toml
index ac40e32..cb9d8aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "colour-dash"
-version = "0.2.5"
+version = "0.2.6"
 description = "Various colour science Dash apps built on top of Colour"
 license = "BSD-3-Clause"
 authors = [ "Colour Developers <colour-developers@colour-science.org>" ]