diff --git a/pyproject.toml b/pyproject.toml
index c9cd7ce..3789cdc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "giant"
-version = "0.3.0"
+version = "0.3.1"
 description = "Geant4 step-function surrogate via conditional flow matching"
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/uv.lock b/uv.lock
index 97f81e7..c4e2c8e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -633,7 +633,7 @@ wheels = [
 
 [[package]]
 name = "giant"
-version = "0.3.0"
+version = "0.3.1"
 source = { editable = "." }
 dependencies = [
     { name = "numpy" },