diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4be852c..dad5bf7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,12 +2,15 @@
 
 Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) convention.
 
+## [0.1.7] - 2023-11-30
+
++ Allow null value for `session_datetime` in `session_with_id`
+
 ## [0.1.6] - 2023-09-18
 
 + Update - NWB export checks for activated session schema to allow use of both
   `session_with_id` and `session_with_datetime`
 
-
 ## [0.1.5] - 2023-06-20
 
 + Update - GitHub Actions workflows
@@ -45,6 +48,7 @@ Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and
 + Add - GitHub Action release process
 + Add - `session` schema
 
+[0.1.7]: https://github.com/datajoint/element-session/releases/tag/0.1.7
 [0.1.6]: https://github.com/datajoint/element-session/releases/tag/0.1.6
 [0.1.5]: https://github.com/datajoint/element-session/releases/tag/0.1.5
 [0.1.4]: https://github.com/datajoint/element-session/releases/tag/0.1.4
diff --git a/element_session/session_with_id.py b/element_session/session_with_id.py
index 880ffdc..dfc5330 100644
--- a/element_session/session_with_id.py
+++ b/element_session/session_with_id.py
@@ -54,14 +54,14 @@ class Session(dj.Manual):
     Attributes:
         Subject (foreign key): Key for Subject table
         session_id (int): Unique numeric session ID
-        session_datetime (datetime): date and time of the session
+        session_datetime (datetime, optional): date and time of the session
     """
 
     definition = """
     -> Subject
     session_id: int
     ---
-    session_datetime: datetime
+    session_datetime=null: datetime
     """
 
     class Attribute(dj.Part):
diff --git a/element_session/version.py b/element_session/version.py
index 7350757..f5d1ec6 100644
--- a/element_session/version.py
+++ b/element_session/version.py
@@ -1,2 +1,2 @@
 """Package metadata."""
-__version__ = "0.1.6"
+__version__ = "0.1.7"