diff --git a/packages/serialize/package.json b/packages/serialize/package.json
index 27922d4c4..1658cdb45 100644
--- a/packages/serialize/package.json
+++ b/packages/serialize/package.json
@@ -64,14 +64,14 @@
   },
   "homepage": "https://github.com/jaredwray/keyv",
   "dependencies": {
-    "buffer": "^6.0.1"
+    "buffer": "^6.0.3"
   },
   "devDependencies": {
     "@keyv/test-suite": "*",
     "keyv": "*",
     "ts-node": "^10.9.2",
     "tsd": "^0.31.0",
-    "typescript": "^5.4.3"
+    "typescript": "^5.4.5"
   },
   "tsd": {
     "directory": "test"
diff --git a/packages/serialize/test/test.ts b/packages/serialize/test/test.ts
index 9749f54be..5978401c6 100644
--- a/packages/serialize/test/test.ts
+++ b/packages/serialize/test/test.ts
@@ -1,3 +1,4 @@
+import {Buffer} from 'node:buffer';
 import test from 'ava';
 import {defaultDeserialize, defaultSerialize} from '../src';
 
@@ -19,8 +20,55 @@ test('serialization and deserialization of boolean value', t => {
 	t.is(deserialized.value, true);
 });
 
+test('serialization and deserialization of only string value', t => {
+	const serialized = defaultSerialize('foo');
+	t.is(defaultDeserialize<string>(serialized), 'foo');
+});
+
+test('serialization and deserialization of only string value with colon', t => {
+	const serialized = defaultSerialize(':base64:aGVsbG8gd29ybGQ=');
+	t.is(defaultDeserialize<string>(serialized), ':base64:aGVsbG8gd29ybGQ=');
+});
+
 test('serialization and deserialization of object value', t => {
 	const serialized = defaultSerialize({value: {foo: 'bar', bar: 5, baz: true, def: undefined, nul: null}});
 	const deserialized = defaultDeserialize<{value: {foo: string; bar: number; baz: boolean; def?: string; nul: string | undefined}}>(serialized);
 	t.deepEqual(deserialized.value, {foo: 'bar', bar: 5, baz: true, nul: null});
 });
+
+test('defaultSerialize converts Buffer to base64 JSON string', t => {
+	const buffer = Buffer.from('hello world', 'utf8');
+	const expectedResult = JSON.stringify(':base64:' + buffer.toString('base64'));
+	const result = defaultSerialize(buffer);
+	t.is(result, expectedResult);
+});
+
+test('serialization toJSON is called on object', t => {
+	// eslint-disable-next-line @typescript-eslint/naming-convention
+	const serialized = defaultSerialize({value: {toJSON: () => 'foo'}});
+	const deserialized = defaultDeserialize<{value: string}>(serialized);
+	t.is(deserialized.value, 'foo');
+});
+
+test('serialization with array in array', t => {
+	const serialized = defaultSerialize({value: [[1, 2], [3, 4]]});
+	const deserialized = defaultDeserialize<{value: number[][]}>(serialized);
+	t.deepEqual(deserialized.value, [[1, 2], [3, 4]]);
+});
+
+test('defaultSerialize detects base64 on string', t => {
+	const json = JSON.stringify({
+		encoded: ':base64:aGVsbG8gd29ybGQ=', // "hello world" in base64
+	});
+	const result = defaultDeserialize<{encoded: Buffer}>(json);
+	t.is(result.encoded.toString(), 'hello world');
+});
+
+test('removes the first colon from strings not prefixed by base64', t => {
+	const json = JSON.stringify({
+		simple: ':hello',
+	});
+
+	const result = defaultDeserialize<{simple: string}>(json);
+	t.is(result.simple, 'hello');
+});