diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 3a1b760d..a45a2ba5 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.27.1
+current_version = 0.28.0
 commit = True
 tag = True
 
diff --git a/CITATION.cff b/CITATION.cff
index 6e0d2896..b68d4ca2 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -8,5 +8,5 @@ authors:
     orcid: https://orcid.org/0000-0002-6349-818X
 title: "dfm_tools: A Python package for pre- and postprocessing D-FlowFM model input and output files"
 type: software
-version: 0.27.1
+version: 0.28.0
 doi: https://doi.org/10.5281/zenodo.7857393
diff --git a/dfm_tools/__init__.py b/dfm_tools/__init__.py
index 047e370f..d1df9ff6 100644
--- a/dfm_tools/__init__.py
+++ b/dfm_tools/__init__.py
@@ -4,7 +4,7 @@
 
 __author__ = """Jelmer Veenstra"""
 __email__ = "jelmer.veenstra@deltares.nl"
-__version__ = "0.27.1"
+__version__ = "0.28.0"
 
 from dfm_tools.deprecated import *
 from dfm_tools.download import *
diff --git a/docs/whats-new.md b/docs/whats-new.md
index 64f1395b..9fba1eba 100644
--- a/docs/whats-new.md
+++ b/docs/whats-new.md
@@ -1,9 +1,10 @@
 # What's new
 
-## UNRELEASED
+## 0.28.0 (2024-09-26)
 
 ### Fix
 - more robust CDS/ECMWF authentication check and support for new cdsapi versions in [#1004](https://github.com/Deltares/dfm_tools/pull/1004)
+- set default copernicusmarine buffer to 0.5 instead of 0 in [#1009](https://github.com/Deltares/dfm_tools/pull/1009)
 
 
 ## 0.27.0 (2024-09-09)
diff --git a/pyproject.toml b/pyproject.toml
index bcb49717..254bfa13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "dfm_tools"
-version = "0.27.1"
+version = "0.28.0"
 maintainers = [{ name = "Jelmer Veenstra", email = "jelmer.veenstra@deltares.nl" }]
 description = "dfm_tools are pre- and post-processing tools for Delft3D FM"
 readme = "README.md"