diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3ee148d..9254312 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,11 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version-file: 'go.mod'
+          # go.mod pins a `toolchain` newer than the `go` line, so setup-go
+          # installs the older Go and GOTOOLCHAIN downloads the toolchain into
+          # the module cache; setup-go's cache tar then collides on those
+          # read-only toolchain files (tar: .../cgo: File exists). Skip caching.
+          cache: false
       - name: Build
         run: go build ./...
       - name: Vet
diff --git a/go.mod b/go.mod
index aff3cad..f1b01b3 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module github.com/codefly-dev/service-s3
 
 go 1.26
 
+toolchain go1.26.6
+
 require (
 	github.com/codefly-dev/core v0.3.4
 	google.golang.org/grpc v1.83.0