diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 41af4a1..cfd7404 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -16,8 +16,7 @@ jobs:
     strategy:
       matrix:
         go:
-          - '1.21' # minimum supported version
-          - 'stable'
+          - '1.20' # Go version of Ikemen GO
     name: "build with Go ${{ matrix.go }}"
     steps:
       - uses: actions/checkout@v4
diff --git a/go.mod b/go.mod
index bb517fd..1a28405 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/gopxl/beep/v2
 
-go 1.21
+go 1.20
 
 require (
 	github.com/ebitengine/oto/v3 v3.2.0