diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b4e42a1..d15178f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go-version: [1.17, oldstable, stable]
+        go-version: [1.18, oldstable, stable]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/env.go b/env.go
index 99a9484..6d45ec6 100644
--- a/env.go
+++ b/env.go
@@ -191,6 +191,28 @@ func ParseWithOptions(v interface{}, opts Options) error {
 	return parseInternal(v, setField, customOptions(opts))
 }
 
+// ParseAs parses the given struct type containing `env` tags and loads its
+// values from environment variables.
+func ParseAs[T any]() (T, error) {
+	var t T
+	return t, Parse(&t)
+}
+
+// ParseWithOptions parses the given struct type containing `env` tags and
+// loads its values from environment variables.
+func ParseAsWithOptions[T any](opts Options) (T, error) {
+	var t T
+	return t, ParseWithOptions(&t, opts)
+}
+
+// Must panic is if err is not nil, and returns t otherwise.
+func Must[T any](t T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return t
+}
+
 // GetFieldParams parses a struct containing `env` tags and returns information about
 // tags it found.
 func GetFieldParams(v interface{}) ([]FieldParams, error) {
diff --git a/env_generic.go b/env_generic.go
deleted file mode 100644
index d14003e..0000000
--- a/env_generic.go
+++ /dev/null
@@ -1,26 +0,0 @@
-//go:build go1.18
-// +build go1.18
-
-package env
-
-// ParseAs parses the given struct type containing `env` tags and loads its
-// values from environment variables.
-func ParseAs[T any]() (T, error) {
-	var t T
-	return t, Parse(&t)
-}
-
-// ParseWithOptions parses the given struct type containing `env` tags and
-// loads its values from environment variables.
-func ParseAsWithOptions[T any](opts Options) (T, error) {
-	var t T
-	return t, ParseWithOptions(&t, opts)
-}
-
-// Must panic is if err is not nil, and returns t otherwise.
-func Must[T any](t T, err error) T {
-	if err != nil {
-		panic(err)
-	}
-	return t
-}
diff --git a/env_generic_test.go b/env_generic_test.go
deleted file mode 100644
index bed4896..0000000
--- a/env_generic_test.go
+++ /dev/null
@@ -1,46 +0,0 @@
-//go:build go1.18
-// +build go1.18
-
-package env
-
-import "testing"
-
-type Conf struct {
-	Foo string `env:"FOO" envDefault:"bar"`
-}
-
-func TestParseAs(t *testing.T) {
-	config, err := ParseAs[Conf]()
-	isNoErr(t, err)
-	isEqual(t, "bar", config.Foo)
-}
-
-func TestParseAsWithOptions(t *testing.T) {
-	config, err := ParseAsWithOptions[Conf](Options{
-		Environment: map[string]string{
-			"FOO": "not bar",
-		},
-	})
-	isNoErr(t, err)
-	isEqual(t, "not bar", config.Foo)
-}
-
-type ConfRequired struct {
-	Foo string `env:"FOO,required"`
-}
-
-func TestMust(t *testing.T) {
-	t.Run("error", func(t *testing.T) {
-		defer func() {
-			err := recover()
-			isErrorWithMessage(t, err.(error), `env: required environment variable "FOO" is not set`)
-		}()
-		conf := Must(ParseAs[ConfRequired]())
-		isEqual(t, "", conf.Foo)
-	})
-	t.Run("success", func(t *testing.T) {
-		t.Setenv("FOO", "bar")
-		conf := Must(ParseAs[ConfRequired]())
-		isEqual(t, "bar", conf.Foo)
-	})
-}
diff --git a/env_test.go b/env_test.go
index 65628ed..e80075e 100644
--- a/env_test.go
+++ b/env_test.go
@@ -1854,6 +1854,46 @@ func TestGetFieldParamsError(t *testing.T) {
 	isTrue(t, errors.Is(err, NotStructPtrError{}))
 }
 
+type Conf struct {
+	Foo string `env:"FOO" envDefault:"bar"`
+}
+
+func TestParseAs(t *testing.T) {
+	config, err := ParseAs[Conf]()
+	isNoErr(t, err)
+	isEqual(t, "bar", config.Foo)
+}
+
+func TestParseAsWithOptions(t *testing.T) {
+	config, err := ParseAsWithOptions[Conf](Options{
+		Environment: map[string]string{
+			"FOO": "not bar",
+		},
+	})
+	isNoErr(t, err)
+	isEqual(t, "not bar", config.Foo)
+}
+
+type ConfRequired struct {
+	Foo string `env:"FOO,required"`
+}
+
+func TestMust(t *testing.T) {
+	t.Run("error", func(t *testing.T) {
+		defer func() {
+			err := recover()
+			isErrorWithMessage(t, err.(error), `env: required environment variable "FOO" is not set`)
+		}()
+		conf := Must(ParseAs[ConfRequired]())
+		isEqual(t, "", conf.Foo)
+	})
+	t.Run("success", func(t *testing.T) {
+		t.Setenv("FOO", "bar")
+		conf := Must(ParseAs[ConfRequired]())
+		isEqual(t, "bar", conf.Foo)
+	})
+}
+
 func isTrue(tb testing.TB, b bool) {
 	tb.Helper()
 
diff --git a/go.mod b/go.mod
index 67c4c80..5aea115 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/caarlos0/env/v10
 
-go 1.17
+go 1.18