diff --git a/.circleci/config.yml b/.circleci/config.yml
index fedba9ea4..ed9f399d4 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,7 +4,7 @@ parameters:
 defaults: &defaults
   resource_class: large
   docker:
-      - image: bepsays/ci-hugoreleaser:1.22600.20500
+      - image: bepsays/ci-hugoreleaser:1.22700.20000
 environment: &buildenv
       GOMODCACHE: /root/project/gomodcache
 version: 2
@@ -58,7 +58,7 @@ jobs:
     environment:
         <<: [*buildenv]
     docker:
-    - image: bepsays/ci-hugoreleaser-linux-arm64:1.22600.20500
+    - image: bepsays/ci-hugoreleaser-linux-arm64:1.22700.20000
     steps:
       - *restore-cache
       - &attach-workspace
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1c104cf5e..8646415e8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.26.x]
+        go-version: [1.27.x]
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/go.mod b/go.mod
index e10b249d2..db3f24bcf 100644
--- a/go.mod
+++ b/go.mod
@@ -186,4 +186,4 @@ require (
 	software.sslmate.com/src/go-pkcs12 v0.7.0 // indirect
 )
 
-go 1.26.0
+go 1.27.0
diff --git a/scripts/fork_go_templates/main.go b/scripts/fork_go_templates/main.go
index b1af8621a..6787e1dab 100644
--- a/scripts/fork_go_templates/main.go
+++ b/scripts/fork_go_templates/main.go
@@ -15,8 +15,16 @@ import (
 )
 
 func main() {
-	// The current is built with 2dc996f71b0ebafb77e64433e58333e049488a3c go1.26.3
-	// TODO(bep) preserve the staticcheck.conf file.
+	/*
+		Previously: with 2dc996f71b0ebafb77e64433e58333e049488a3c go1.26.3
+		Current:  8af21751f0 [release-branch.go1.27] go1.27.0
+
+		Note that the upgrade here is mostly automatic, but there are some manual steps:
+
+		* There's some unrelevant test codes that depends on some some internals in Go: Remove or stub these out to make it build.
+		* There's one failing test case as we have slightly cbhanged the meaning of isTrue.
+		* We're only patching the execution part of the template packages, so it's also good to check the execution package's Git history to check for valuable changes in our patched files.
+	*/
 	fmt.Println("Forking ...")
 	defer fmt.Println("Done ...")
 
@@ -37,7 +45,6 @@ func main() {
 }
 
 const (
-	// TODO(bep)
 	goSource = "/Users/bep/dev/go/misc/go/src"
 	forkRoot = "../../tpl/internal/go_templates"
 )
@@ -140,10 +147,18 @@ var fs = afero.NewOsFs()
 
 // Removes all non-Hugo files in the go_templates folder.
 func cleanFork() {
+	keepRe := regexp.MustCompile(`(?i)hugo|staticcheck\.conf`)
 	must(filepath.Walk(filepath.Join(forkRoot), func(path string, info os.FileInfo, err error) error {
-		if !info.IsDir() && len(path) > 10 && !strings.Contains(path, "hugo") {
-			must(fs.Remove(path))
+		if info.IsDir() || len(path) <= 10 {
+			return nil
 		}
+
+		if keepRe.MatchString(info.Name()) {
+			return nil
+		}
+
+		must(fs.Remove(path))
+
 		return nil
 	}))
 }