diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 78e70b57..02d360d3 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -74,7 +74,7 @@ repos:
 
   # Format Snakemake rule / workflow files
 - repo: https://github.com/snakemake/snakefmt
-  rev: v0.8.5
+  rev: v0.9.0
   hooks:
   - id: snakefmt
 
diff --git a/doc/release_notes.rst b/doc/release_notes.rst
index be6be9fd..52b2ddc2 100644
--- a/doc/release_notes.rst
+++ b/doc/release_notes.rst
@@ -12,7 +12,7 @@ Upcoming Release
 
 * New configuration option ``everywhere_powerplants`` to build conventional powerplants everywhere, irrespective of existing powerplants locations, in the network (https://github.com/PyPSA/pypsa-eur/pull/850).
 
-* Remove option for wave energy as technology data is not maintained. 
+* Remove option for wave energy as technology data is not maintained.
 
 
 PyPSA-Eur 0.9.0 (5th January 2024)
diff --git a/rules/retrieve.smk b/rules/retrieve.smk
index 7a180e22..5e1e3e59 100644
--- a/rules/retrieve.smk
+++ b/rules/retrieve.smk
@@ -191,7 +191,7 @@ if config["enable"]["retrieve"]:
         input:
             HTTP.remote(
                 "data.open-power-system-data.org/time_series/{version}/time_series_60min_singleindex.csv".format(
-                version="2019-06-05"
+                    version="2019-06-05"
                     if config["snapshots"]["end"] < "2019"
                     else "2020-10-06"
                 ),