diff --git a/.bumpversion.toml b/.bumpversion.toml
index 481a4ba..d94c390 100644
--- a/.bumpversion.toml
+++ b/.bumpversion.toml
@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "0.3.8"
+current_version = "0.3.9"
 parse = "(?P<major>\\d+)\\.(?P<minor>\\d+)\\.(?P<patch>\\d+)"
 serialize = ["{major}.{minor}.{patch}"]
 search = "{current_version}"
diff --git a/pyproject.toml b/pyproject.toml
index 1202040..a7eec11 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "giant"
-version = "0.3.8"
+version = "0.3.9"
 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 fb3ee2a..33d4ed2 100644
--- a/uv.lock
+++ b/uv.lock
@@ -675,7 +675,7 @@ wheels = [
 
 [[package]]
 name = "giant"
-version = "0.3.8"
+version = "0.3.9"
 source = { editable = "." }
 dependencies = [
     { name = "numpy" },