diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 16a8780..203bd39 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15.x
+          go-version: 1.13.x
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Run linters
@@ -25,7 +25,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ 1.15.x ]
+        go-version: [ 1.13.x ]
         platform: [ ubuntu-latest, macos-latest, windows-latest ]
     runs-on: ${{ matrix.platform }}
     steps:
@@ -46,7 +46,7 @@ jobs:
         if: success()
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15.x
+          go-version: 1.13.x
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Calc coverage
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ff3af42..fe9d592 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -18,7 +18,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15
+          go-version: 1.13
       -
         name: Cache Go modules
         uses: actions/cache@v1
diff --git a/go.mod b/go.mod
index 5eb3c79..dbb77b8 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/csueiras/reinforcer
 
-go 1.15
+go 1.13
 
 require (
 	github.com/dave/jennifer v1.4.1
diff --git a/internal/generator/generator_test.go b/internal/generator/generator_test.go
index 3184256..9ff7958 100644
--- a/internal/generator/generator_test.go
+++ b/internal/generator/generator_test.go
@@ -517,7 +517,7 @@ func loadInterface(t *testing.T, filesCode map[string]input) []*generator.FileCo
 		},
 	}
 	exported := packagestest.Export(t, packagestest.GOPATH, mods)
-	t.Cleanup(exported.Cleanup)
+	defer exported.Cleanup()
 
 	l := loader.NewLoader(func(cfg *packages.Config, patterns ...string) ([]*packages.Package, error) {
 		exported.Config.Mode = cfg.Mode
diff --git a/internal/loader/loader_test.go b/internal/loader/loader_test.go
index 963f841..300afb2 100644
--- a/internal/loader/loader_test.go
+++ b/internal/loader/loader_test.go
@@ -22,7 +22,7 @@ type Service interface {
 }
 `,
 		}}})
-	t.Cleanup(exported.Cleanup)
+	defer exported.Cleanup()
 
 	l := loader.NewLoader(func(cfg *packages.Config, patterns ...string) ([]*packages.Package, error) {
 		exported.Config.Mode = cfg.Mode
@@ -60,7 +60,7 @@ type NotAnInterface struct {
 }
 `,
 		}}})
-	t.Cleanup(exported.Cleanup)
+	defer exported.Cleanup()
 
 	t.Run("RegEx", func(t *testing.T) {
 		l := loader.NewLoader(func(cfg *packages.Config, patterns ...string) ([]*packages.Package, error) {