diff --git a/PKG-INFO b/PKG-INFO
index 00aeeecea3e860bc2fbf89426f6edc14c2cc7a08..a97b885dbb6ac74bb8697d848cb7f7654ba288c7 100644
--- a/PKG-INFO
+++ b/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: swh.model
-Version: 0.0.39
+Version: 0.0.40
 Summary: Software Heritage data model
 Home-page: https://forge.softwareheritage.org/diffusion/DMOD/
 Author: Software Heritage developers
diff --git a/swh.model.egg-info/PKG-INFO b/swh.model.egg-info/PKG-INFO
index 00aeeecea3e860bc2fbf89426f6edc14c2cc7a08..a97b885dbb6ac74bb8697d848cb7f7654ba288c7 100644
--- a/swh.model.egg-info/PKG-INFO
+++ b/swh.model.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: swh.model
-Version: 0.0.39
+Version: 0.0.40
 Summary: Software Heritage data model
 Home-page: https://forge.softwareheritage.org/diffusion/DMOD/
 Author: Software Heritage developers
diff --git a/swh/model/model.py b/swh/model/model.py
index 1c54004f3b03f2ed0dd34b9076e6e935ae9a04d4..5f2d960a8a7bf6be2dc943c27ebd5deb6c74a287 100644
--- a/swh/model/model.py
+++ b/swh/model/model.py
@@ -12,6 +12,8 @@ import dateutil.parser
 
 from .identifiers import normalize_timestamp
 
+SHA1_SIZE = 20
+
 # TODO: Limit this to 20 bytes
 Sha1Git = bytes
 
diff --git a/version.txt b/version.txt
index 58b0d8f98aed5a73279e7e32838b94ab83cca2a1..f57c086155d813c6da9d5222efe96821263bb513 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-v0.0.39-0-ga92af53
\ No newline at end of file
+v0.0.40-0-g56eb29f
\ No newline at end of file