diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 13e66f0..3abbbb3 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -9,7 +9,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.14.x, 1.15.x]
+        go-version: [1.20.x, 1.21.x]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/fuzz_test.go b/fuzz_test.go
new file mode 100644
index 0000000..e4892ef
--- /dev/null
+++ b/fuzz_test.go
@@ -0,0 +1,75 @@
+package bip39
+
+import "testing"
+
+func FuzzNewMnemonic(f *testing.F) {
+	if testing.Short() {
+		f.Skip("Running in -short mode")
+	}
+
+	// 1. Firstly add some seeds
+	f.Add([]byte("00000000000000000000000000000000"))
+	f.Add([]byte("7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f"))
+	f.Add([]byte("80808080808080808080808080808080"))
+	f.Add([]byte("18ab19a9f54a9274f03e5209a2ac8a91"))
+	f.Add([]byte("b63a9c59a6e641f288ebc103017f1da9f8290b3da6bdef7b"))
+	f.Add([]byte("18a2e1d81b8ecfb2a333adcb0c17a5b9eb76cc5d05db91a4"))
+	f.Add([]byte("15da872c95a13dd738fbf50e427583ad61f18fd99f628c417a61cf8343c90419"))
+
+	// 2. Now run the fuzzer.
+	f.Fuzz(func(t *testing.T, entropy []byte) {
+		_, _ = NewMnemonic(entropy)
+	})
+}
+
+func FuzzMnemonicToByteArray(f *testing.F) {
+	if testing.Short() {
+		f.Skip("Running in -short mode")
+	}
+
+	// 1. Firstly add some seeds
+	f.Add(" ")
+	f.Add("")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art art")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon agent")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about")
+	f.Add("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon")
+	f.Add("afford alter spike radar gate glance object seek swamp infant panel yellow")
+	f.Add("beyond stage sleep clip because twist token leaf atom beauty genius food business side grid unable middle armed observe pair crouch tonight away coconut")
+	f.Add("board blade invite damage undo sun mimic interest slam gaze truly inherit resist great inject rocket museum chief")
+	f.Add("board flee heavy tunnel powder denial science ski answer betray cargo cat")
+	f.Add("clutch control vehicle tonight unusual clog visa ice plunge glimpse recipe series open hour vintage deposit universe tip job dress radar refuse motion taste")
+	f.Add("dignity pass list indicate nasty swamp pool script soccer toe leaf photo multiply desk host tomato cradle drill spread actor shine dismiss champion exotic")
+	f.Add("dignity pass list indicate nasty")
+	f.Add("exile ask congress lamp submit jacket era scheme attend cousin alcohol catch course end lucky hurt sentence oven short ball bird grab wing top")
+	f.Add("indicate race push merry suffer human cruise dwarf pole review arch keep canvas theme poem divorce alter left")
+	f.Add("jello better achieve collect unaware mountain thought cargo oxygen act hood bridge")
+	f.Add("jelly better achieve collect unaware mountain thought cargo oxygen act hood bridge")
+	f.Add("kiss carry display unusual confirm curtain upgrade antique rotate hello void custom frequent obey nut hole price segment")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal will will will")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal will")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth title")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thank yellow yellow")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thank yellow")
+	f.Add("legal winner thank year wave sausage worth useful legal winner thanks year wave worth useful legal winner thank year wave sausage worth title")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letter advice cage above")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic bless")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter always")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter always.")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letter advice caged above")
+	f.Add("letter advice cage absurd amount doctor acoustic avoid letters advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic bless")
+	f.Add("renew stay biology evidence goat welcome casual join adapt armor shuffle fault little machine walk stumble urge swap")
+	f.Add("turtle front uncle idea crush write shrug there lottery flower risk shell")
+	f.Add("zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong")
+	f.Add("zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo when")
+	f.Add("zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo why")
+	f.Add("zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo vote")
+	f.Add("zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo voted")
+
+	// 2. Now run the fuzzer.
+	f.Fuzz(func(t *testing.T, mnemonic string) {
+		_, _ = MnemonicToByteArray(mnemonic)
+	})
+}