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