diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e8921741..79793a95 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -19,7 +19,7 @@ $ git checkout -b your-shiny-new-feature origin/main
 
 ...
 
-$ git commit -m 'feat: do whatever for whatever purpose
+$ git commit -s -m 'feat: do whatever for whatever purpose
 
 This adds ... by:
 
@@ -30,6 +30,9 @@ This adds ... by:
 Resolves #ISSUE_NUMBER
 '
 
+Remember to include a `Signed-off-by: Author Name <authoremail@example.com>`
+line in the commit message, either manually or using the `-s` flag.
+
 $ hub fork
 $ git push YOUR_GITHUB_USER your-shiny-new-feature
 $ hub pull-request
diff --git a/go.mod b/go.mod
index a0f54812..d15bbf42 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/helmfile/helmfile
 
-go 1.25.4
+go 1.25.8
 
 require (
 	dario.cat/mergo v1.0.2