diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index ca7b472..4cdb7d1 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,8 +12,8 @@ jobs:
     strategy:
       matrix:
         go:
-          - "1.23"
-          - "1.24"
+          - "1.25"
+          - "1.26"
     steps:
       - uses: actions/checkout@v3
 
@@ -29,8 +29,8 @@ jobs:
     strategy:
       matrix:
         go:
-          - "1.23"
-          - "1.24"
+          - "1.25"
+          - "1.26"
     steps:
     - uses: actions/checkout@v3
 
diff --git a/fmttests/datadriven_test.go b/fmttests/datadriven_test.go
index 77b9568..728c682 100644
--- a/fmttests/datadriven_test.go
+++ b/fmttests/datadriven_test.go
@@ -105,7 +105,7 @@ var leafCommands = map[string]commandFn{
 	},
 
 	"unimplemented": func(_ error, args []arg) error {
-		return issuelink.UnimplementedErrorf(issuelink.IssueLink{IssueURL: "https://mysite", Detail: "issuedetails"}, strfy(args))
+		return issuelink.UnimplementedErrorf(issuelink.IssueLink{IssueURL: "https://mysite", Detail: "issuedetails"}, "%s", strfy(args))
 	},
 }
 
diff --git a/go.mod b/go.mod
index 7297c44..d4215fc 100644
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,6 @@
 module github.com/cockroachdb/errors
 
-go 1.23.0
-
-toolchain go1.23.8
+go 1.25.0
 
 require (
 	github.com/cockroachdb/datadriven v1.0.2