diff --git a/go.mod b/go.mod
index 9709a07..c154ca5 100644
--- a/go.mod
+++ b/go.mod
@@ -5,9 +5,9 @@ go 1.20
 require (
 	github.com/fatih/color v1.13.0
 	github.com/gofrs/flock v0.8.1
+	github.com/liamg/memoryfs v1.6.0
 	github.com/mattn/go-isatty v0.0.16
 	github.com/platformsh/platformify v0.1.2
-	github.com/spf13/afero v1.9.5
 	github.com/spf13/cobra v1.6.1
 	github.com/spf13/viper v1.15.0
 	github.com/stretchr/testify v1.8.1
@@ -40,6 +40,7 @@ require (
 	github.com/pelletier/go-toml/v2 v2.0.6 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/shopspring/decimal v1.2.0 // indirect
+	github.com/spf13/afero v1.9.5 // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
diff --git a/go.sum b/go.sum
index 181dc22..1424593 100644
--- a/go.sum
+++ b/go.sum
@@ -170,6 +170,8 @@ github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/liamg/memoryfs v1.6.0 h1:jAFec2HI1PgMTem5gR7UT8zi9u4BfG5jorCRlLH06W8=
+github.com/liamg/memoryfs v1.6.0/go.mod h1:z7mfqXFQS8eSeBBsFjYLlxYRMRyiPktytvYCYTb3BSk=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
diff --git a/internal/file/file.go b/internal/file/file.go
index 18a14ba..345d02d 100644
--- a/internal/file/file.go
+++ b/internal/file/file.go
@@ -6,9 +6,8 @@ import (
 	"encoding/hex"
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
-
-	"github.com/spf13/afero"
 )
 
 const hashExt = ".sha256"
@@ -46,12 +45,12 @@ func CheckSize(filename string, size int) (bool, error) {
 	return stat.Size() == int64(size), nil
 }
 
-var testableFS = afero.NewOsFs()
+var testableFS = os.DirFS("/")
 
 // CheckHash checks if a file has the given SHA256 hash.
 // It supports reading the file's current hash from a static file saved next to it with the hashExt extension.
 func CheckHash(filename, hash string) (bool, error) {
-	if fh, err := afero.ReadFile(testableFS, filename+hashExt); err == nil {
+	if fh, err := fs.ReadFile(testableFS, filename+hashExt); err == nil {
 		return string(fh) == hash, nil
 	}
 	fh, err := sha256Sum(testableFS, filename)
@@ -69,8 +68,8 @@ func SaveHash(filename, hash string) error {
 }
 
 // sha256Sum calculates the SHA256 hash of a file.
-func sha256Sum(fs afero.Fs, filename string) (string, error) {
-	f, err := fs.Open(filename)
+func sha256Sum(filesystem fs.FS, filename string) (string, error) {
+	f, err := filesystem.Open(filename)
 	if err != nil {
 		return "", err
 	}
diff --git a/internal/file/file_test.go b/internal/file/file_test.go
index b10c7a5..9620f4f 100644
--- a/internal/file/file_test.go
+++ b/internal/file/file_test.go
@@ -4,18 +4,18 @@ import (
 	"os"
 	"testing"
 
-	"github.com/spf13/afero"
+	"github.com/liamg/memoryfs"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func TestCheckHash(t *testing.T) {
 	// Temporarily swap to a memory filesystem.
-	testableFS = afero.NewMemMapFs()
+	testableFS = memoryfs.New()
 	defer func() {
-		testableFS = afero.NewOsFs()
+		testableFS = os.DirFS("/")
 	}()
-	fs := testableFS
+	filesystem := testableFS.(*memoryfs.FS)
 
 	mockContent := "hello world\n"
 	mockContentHash := "a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447"
@@ -54,14 +54,12 @@ func TestCheckHash(t *testing.T) {
 		},
 	}
 
-	filename := "test"
 	for _, c := range cases {
-		require.NoError(t, removeIfExists(fs, filename))
-		require.NoError(t, removeIfExists(fs, filename+hashExt))
 		t.Run(c.name, func(t *testing.T) {
-			require.NoError(t, afero.WriteFile(fs, filename, []byte(c.content), 0o644))
+			filename := c.name
+			require.NoError(t, filesystem.WriteFile(filename, []byte(c.content), 0o644))
 			if c.writeHash != "" {
-				require.NoError(t, afero.WriteFile(fs, filename+hashExt, []byte(c.writeHash), 0o644))
+				require.NoError(t, filesystem.WriteFile(filename+hashExt, []byte(c.writeHash), 0o644))
 			}
 			hashOK, err := CheckHash(filename, c.checkHash)
 			assert.NoError(t, err)
@@ -69,10 +67,3 @@ func TestCheckHash(t *testing.T) {
 		})
 	}
 }
-
-func removeIfExists(fs afero.Fs, filename string) error {
-	if err := fs.Remove(filename); err != nil && !os.IsNotExist(err) {
-		return err
-	}
-	return nil
-}