diff --git a/LICENSE b/LICENSE.txt
similarity index 100%
rename from LICENSE
rename to LICENSE.txt
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 000000000..66e96e78b
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,3 @@
+include LICENSE.txt
+include metadata.json
+include setup.json
diff --git a/aiidalab_widgets_base/__init__.py b/aiidalab_widgets_base/__init__.py
index 7db3fd458..7a6b6e8a0 100644
--- a/aiidalab_widgets_base/__init__.py
+++ b/aiidalab_widgets_base/__init__.py
@@ -12,4 +12,4 @@
 from .structures import StructureUploadWidget  # noqa
 from .structures_multi import MultiStructureUploadWidget  # noqa
 
-__version__ = "0.4.0b1"
+__version__ = "0.4.0b2"
diff --git a/metadata.json b/metadata.json
index c6409cbc7..d0272354e 100644
--- a/metadata.json
+++ b/metadata.json
@@ -2,7 +2,7 @@
     "title": "AiiDA Lab Widgets",
     "description": "Reusable widgets for applications in the AiiDA Lab.",
     "authors": "AiiDA Team",
-    "version": "0.4.0b1",
+    "version": "0.4.0b2",
     "logo": "miscellaneous/logos/aiidalab.png",
     "state": "stable"
 }