diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b6674b395..9f744b8ca 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: ['1.21.x']
+        go-version: [1.19.x, 1.20.x, 1.21.x]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -23,7 +23,7 @@ jobs:
     - name: Install Go
       uses: actions/setup-go@v4
       with:
-        go-version: '1.21.x'
+        go-version: 1.21.x
     - name: Checkout code
       uses: actions/checkout@v3
     - uses: actions/cache@v2
diff --git a/go.mod b/go.mod
index 5dc56ea3d..c64a19120 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/xyproto/algernon
 
-go 1.20
+go 1.19
 
 require (
 	github.com/caddyserver/certmagic v0.19.2