diff --git a/aiidalab_ispg/__init__.py b/aiidalab_ispg/__init__.py
index 5213695..4294c78 100644
--- a/aiidalab_ispg/__init__.py
+++ b/aiidalab_ispg/__init__.py
@@ -1 +1 @@
-__version__ = "0.2.0a3"
+__version__ = "0.2.0a4"
diff --git a/pyproject.toml b/pyproject.toml
index 15e047a..0780e7c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ target-version = "py39"
 ignore = ["E501", "S101", "PT004", "PTH123"]
 
 [tool.bumpver]
-current_version = "v0.2.0a3"
+current_version = "v0.2.0a4"
 version_pattern = "vMAJOR.MINOR.PATCH[PYTAGNUM]"
 commit_message = "bump version {old_version} -> {new_version}"
 commit = true
diff --git a/setup.cfg b/setup.cfg
index 3ee967a..48b3acb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,7 +5,7 @@ categories = quantum
 
 [metadata]
 name = aiidalab-ispg
-version = 0.2.0a3
+version = 0.2.0a4
 author = Daniel Hollas
 author_email = daniel.hollas@bristol.ac.uk
 description = ISPG applications in AiiDALab