diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 81869436..c629f344 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.19.x, 1.20.x]
+        go-version: [1.20.x, 1.21.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     name: "Build ${{ matrix.go-version }} test on ${{ matrix.platform }}"
diff --git a/README.md b/README.md
index ecf4f785..c4da5dfa 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ Please see our [Docker documentation](doc/docker.md).
 
 ### Installation from source or Git
 
-You need the Go compiler (1.19+). You can get it at the [Go
+You need the Go compiler (1.20+). You can get it at the [Go
 website](https://golang.org).
 
 The easiest way is via `go install`:
diff --git a/pkg/geoipupdate/config_test.go b/pkg/geoipupdate/config_test.go
index 0c4b1227..7f3cea86 100644
--- a/pkg/geoipupdate/config_test.go
+++ b/pkg/geoipupdate/config_test.go
@@ -828,7 +828,8 @@ func TestValidateConfig(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.Description, func(t *testing.T) {
-			err := validateConfig(&test.Config)
+			config := test.Config
+			err := validateConfig(&config)
 			if test.Err == "" {
 				assert.NoError(t, err, test.Description)
 			} else {