diff --git a/pyproject.toml b/pyproject.toml
index 5b3c0d3bc08e5910ff202962516759b046c02861..24698e75f6709d1db6bd78bd960c84ccc1b02ac5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "reference_model"
-version = "0.1.2"
+version = "0.1.3"
 description = "Example VIPS model, showcasing functionality"
 readme = "README.md"
 authors = [{ name="Tor-Einar Skog", email="tor-einar.skog@nibio.no" }]
@@ -24,9 +24,11 @@ dependencies = [
 
 requires-python = ">=3.9"
 
+[project.optional-dependencies]
+dev = ["bumpver", "pytest"]
 
 [tool.bumpver]
-current_version = "0.1.2"
+current_version = "0.1.3"
 version_pattern = "MAJOR.MINOR.PATCH"
 commit_message = "bump version {old_version} -> {new_version}"
 commit = true