diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9887576d..5f7f438f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,15 +11,15 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: ["1.18.x"]
+        go-version: ["1.22.x"]
         os: ["ubuntu-latest"]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - name: Check style
diff --git a/cmd/test_gen/main.go b/cmd/test_gen/main.go
index 49399927..87867137 100644
--- a/cmd/test_gen/main.go
+++ b/cmd/test_gen/main.go
@@ -1,11 +1,10 @@
-//go:generate go run main.go -go -out ../../internal/examples/semantics/generated_test.go ../../internal/examples/semantics
+//go:generate go run main.go -go -out ../../testdata/examples/semantics/generated_test.go ../../testdata/examples/semantics
 package main
 
 import (
 	"bufio"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"regexp"
@@ -96,7 +95,7 @@ func main() {
 		os.Exit(1)
 	}
 	srcDir := flag.Arg(0)
-	files, err := ioutil.ReadDir(srcDir)
+	files, err := os.ReadDir(srcDir)
 	if err != nil {
 		panic(err)
 	}
diff --git a/examples_test.go b/examples_test.go
index 6408eef2..3d5bdc47 100644
--- a/examples_test.go
+++ b/examples_test.go
@@ -19,7 +19,6 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"io/ioutil"
 	"os"
 	"path"
 	"regexp"
@@ -85,7 +84,7 @@ func (t positiveTest) ActualFile() string {
 
 // Gold returns the contents of the gold Ast as a string
 func (t positiveTest) Gold() string {
-	expected, err := ioutil.ReadFile(t.GoldFile())
+	expected, err := os.ReadFile(t.GoldFile())
 	if err != nil {
 		return ""
 	}
@@ -94,7 +93,7 @@ func (t positiveTest) Gold() string {
 
 // UpdateGold updates the gold output with real results
 func (t positiveTest) UpdateGold(actual string) {
-	err := ioutil.WriteFile(t.GoldFile(), []byte(actual), 0644)
+	err := os.WriteFile(t.GoldFile(), []byte(actual), 0644)
 	if err != nil {
 		panic(err)
 	}
@@ -102,7 +101,7 @@ func (t positiveTest) UpdateGold(actual string) {
 
 // PutActual updates the actual test output with the real results
 func (t positiveTest) PutActual(actual string) {
-	err := ioutil.WriteFile(t.ActualFile(), []byte(actual), 0644)
+	err := os.WriteFile(t.ActualFile(), []byte(actual), 0644)
 	if err != nil {
 		panic(err)
 	}
diff --git a/machine/filesys/filesys_test.go b/machine/filesys/filesys_test.go
index 01fba654..e8ebbe5e 100644
--- a/machine/filesys/filesys_test.go
+++ b/machine/filesys/filesys_test.go
@@ -2,7 +2,6 @@ package filesys_test
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"sort"
 	"testing"
@@ -23,7 +22,7 @@ func (s *FilesysSuite) SetupTest() {
 		s.fs = filesys.NewMemFs()
 	} else {
 		var err error
-		s.dir, err = ioutil.TempDir("", "test.dir")
+		s.dir, err = os.MkdirTemp("", "test.dir")
 		if err != nil {
 			panic(err)
 		}