diff --git a/empa_molecules/version.py b/empa_molecules/version.py
index c259932..94e255b 100644
--- a/empa_molecules/version.py
+++ b/empa_molecules/version.py
@@ -3,4 +3,4 @@
 
 """This module contains project version information."""
 
-__version__ = "v22.01.0a0"
+__version__ = "v22.01.0a1"
diff --git a/setup.cfg b/setup.cfg
index 018147a..2c60871 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = aiidalab_empa_molecules
-version = 22.01.0a0
+version = 22.01.0a1
 description = App to compute molecular properties.
 long_description = file: README.md
 long_description_content_type = text/markdown
@@ -47,7 +47,7 @@ ignore =
     E203  # Whitespace before ':', preferred formatting for black.
 
 [bumpver]
-current_version = "v22.01.0a0"
+current_version = "v22.01.0a1"
 version_pattern = "v0Y.0M.PATCH[PYTAGNUM]"
 commit_message = "Bump version {old_version} -> {new_version}."
 commit = True