diff --git a/python/CHANGELOG.rst b/python/CHANGELOG.rst
index 635fe32e5a..ad91e4e8f7 100644
--- a/python/CHANGELOG.rst
+++ b/python/CHANGELOG.rst
@@ -1,5 +1,5 @@
 --------------------
-[1.0.3] - 2026-XX-XX
+[1.0.3] - 2026-05-14
 --------------------
 
 In development
diff --git a/python/tskit/_version.py b/python/tskit/_version.py
index 2acaacae49..1ca18ddc34 100644
--- a/python/tskit/_version.py
+++ b/python/tskit/_version.py
@@ -1,4 +1,4 @@
 # Definitive location for the version number.
 # During development, should be x.y.z.devN
 # For beta should be x.y.zbN
-tskit_version = "1.0.3.dev1"
+tskit_version = "1.0.3"