diff --git a/optimade_client/__init__.py b/optimade_client/__init__.py
index 66961b8f..32019628 100644
--- a/optimade_client/__init__.py
+++ b/optimade_client/__init__.py
@@ -9,7 +9,7 @@
 from .summary import OptimadeSummaryWidget
 
 
-__version__ = "2021.9.17"
+__version__ = "2021.9.28"
 __all__ = (
     "HeaderDescription",
     "OptimadeClientFAQ",
diff --git a/optimade_client/cli/run.py b/optimade_client/cli/run.py
index 5c307a3d..e10f8e5d 100644
--- a/optimade_client/cli/run.py
+++ b/optimade_client/cli/run.py
@@ -12,7 +12,7 @@
 
 
 LOGGING_LEVELS = [logging.getLevelName(level).lower() for level in range(0, 51, 10)]
-VERSION = "2021.9.17"  # Avoid importing optimade-client package
+VERSION = "2021.9.28"  # Avoid importing optimade-client package
 
 
 def main(args: list = None):
diff --git a/optimade_client/informational.py b/optimade_client/informational.py
index 6a38b73d..1757bb77 100644
--- a/optimade_client/informational.py
+++ b/optimade_client/informational.py
@@ -34,7 +34,7 @@ class HeaderDescription(ipw.VBox):
 
     HEADER = f"""<p style="font-size:14px;">
 <b>Currently valid OPTIMADE API version</b>: <code>v{__optimade_version__[0]}</code><br>
-<b>Client version</b>: <code>2021.9.17</code><br>
+<b>Client version</b>: <code>2021.9.28</code><br>
 <b>Source code</b>: <a href="{SOURCE_URL}" target="_blank">GitHub</a>
 </p>
 """
diff --git a/setup.py b/setup.py
index 98728993..831f80c9 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
 
 setup(
     name="optimade-client",
-    version="2021.9.17",
+    version="2021.9.28",
     license="MIT License",
     author="Casper Welzel Andersen",
     author_email="casper.andersen@epfl.ch",