diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c289e56..06cf311 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: actions/setup-go@v7
         with:
-          go-version: stable
+          go-version: 1.27.1
       - run: go version
       - run: go vet ./...
       - run: go build ./...
@@ -51,7 +51,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: actions/setup-go@v7
         with:
-          go-version: stable
+          go-version: 1.27.1
       - run: go env GOARCH && go test ./...
 
   arch-qemu:
@@ -69,7 +69,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: actions/setup-go@v7
         with:
-          go-version: stable
+          go-version: 1.27.1
       - run: sudo apt-get update && sudo apt-get install -y qemu-user-static
       - name: Test under qemu (${{ matrix.goarch }})
         run: GOARCH=${{ matrix.goarch }} go test -exec=${{ matrix.qemu }} ./...
@@ -85,6 +85,6 @@ jobs:
       - uses: actions/checkout@v7
       - uses: actions/setup-go@v7
         with:
-          go-version: stable
+          go-version: 1.27.1
       - name: Build ${{ matrix.goos }}/wasm
         run: GOOS=${{ matrix.goos }} GOARCH=wasm go build ./...
diff --git a/benchmarks/go.mod b/benchmarks/go.mod
index e2158dc..f09fcd4 100644
--- a/benchmarks/go.mod
+++ b/benchmarks/go.mod
@@ -5,7 +5,7 @@
 // from inside this directory, or via `benchmarks/run.sh`.
 module github.com/go-ruby-parser/parser/benchmarks
 
-go 1.26.4
+go 1.27.1
 
 require github.com/go-ruby-parser/parser v0.8.0
 
diff --git a/go.mod b/go.mod
index 3c23ad4..cf36984 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/go-ruby-parser/parser
 
-go 1.26.4
+go 1.27.1