diff --git a/.github/workflows/go_test.yml b/.github/workflows/go_test.yml
index 1c38eb4..235bfca 100644
--- a/.github/workflows/go_test.yml
+++ b/.github/workflows/go_test.yml
@@ -6,7 +6,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ '1.24.x', '1.25.x' ]
+        go-version: [ '1.25.x', '1.26.x' ]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index 4e9dd9b..3807f14 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -18,5 +18,5 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9.2.0
         with:
-          version: v2.1.6
+          version: v2.11.4
           args: --timeout=8m
diff --git a/go.mod b/go.mod
index fa10a79..aa1ce89 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/transparency-dev/formats
 
-go 1.24.0
+go 1.25.0
 
 require (
 	github.com/google/go-cmp v0.7.0
diff --git a/log/checkpoint_test.go b/log/checkpoint_test.go
index 52a4e11..0549b11 100644
--- a/log/checkpoint_test.go
+++ b/log/checkpoint_test.go
@@ -172,7 +172,7 @@ type moonLogCheckpoint struct {
 func (m moonLogCheckpoint) Marshal() []byte {
 	b := bytes.Buffer{}
 	b.Write(m.Checkpoint.Marshal())
-	b.WriteString(fmt.Sprintf("%x\n%s\n", m.Timestamp, m.Phase))
+	fmt.Fprintf(&b, "%x\n%s\n", m.Timestamp, m.Phase)
 	return b.Bytes()
 }