diff --git a/config/config.default.yaml b/config/config.default.yaml
index 255a5c1b1..1e7af9ea9 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -697,7 +697,7 @@ industry:
 # docs in https://pypsa-eur.readthedocs.io/en/latest/configuration.html#costs
 costs:
   year: 2030
-  version: v0.8.1
+  version: v0.9.0
   rooftop_share: 0.14  # based on the potentials, assuming  (0.1 kW/m2 and 10 m2/person)
   social_discountrate: 0.02
   fill_values:
diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index 5d443c6c9..6605f9a45 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -10,6 +10,8 @@ Release Notes
 Upcoming Release
 ================
 
+* The technology-data version was updated to v0.9.0.
+
 * Bugfix to avoid duplicated offshore regions.
 
 * Added option ``industry: HVC_environment_sequestration_fraction:`` to specify