diff --git a/bun.lockb b/bun.lockb
index 12d2ffb..c40c716 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/libs/as-sdk-integration-tests/assembly/index.ts b/libs/as-sdk-integration-tests/assembly/index.ts
index b456a0c..80d09f4 100644
--- a/libs/as-sdk-integration-tests/assembly/index.ts
+++ b/libs/as-sdk-integration-tests/assembly/index.ts
@@ -32,6 +32,7 @@ import {
 	TestHttpSuccess,
 	TestPostHttpSuccess,
 } from "./http";
+import { TestInvalidAttribute } from "./invalid-json";
 import { TestGenerateProxyMessage, TestProxyHttpFetch } from "./proxy-http";
 import { TestTallyVmReveals, TestTallyVmRevealsFiltered } from "./tally";
 import { TestTallyVmHttp, TestTallyVmMode } from "./vm-tests";
@@ -97,6 +98,8 @@ if (args === "testHttpRejection") {
 	new TestLogNull().run();
 } else if (args === "testLogFloat") {
 	new TestLogFloat().run();
+} else if (args === "testInvalidAttribute") {
+	new TestInvalidAttribute().run();
 }
 
 Process.error(Bytes.fromUtf8String("No argument given"));
diff --git a/libs/as-sdk-integration-tests/assembly/invalid-json.ts b/libs/as-sdk-integration-tests/assembly/invalid-json.ts
new file mode 100644
index 0000000..0d002ab
--- /dev/null
+++ b/libs/as-sdk-integration-tests/assembly/invalid-json.ts
@@ -0,0 +1,15 @@
+import { Bytes, OracleProgram, Process } from "../../as-sdk/assembly";
+
+@json
+class InvalidAttribute {
+	value!: string;
+}
+
+export class TestInvalidAttribute extends OracleProgram {
+	execution(): void {
+		const result =
+			Bytes.fromUtf8String(`{"value":0}`).toJSON<InvalidAttribute>();
+
+		Process.success(Bytes.fromJSON(result));
+	}
+}
diff --git a/libs/as-sdk-integration-tests/src/invalid-json.test.ts b/libs/as-sdk-integration-tests/src/invalid-json.test.ts
new file mode 100644
index 0000000..54f50d3
--- /dev/null
+++ b/libs/as-sdk-integration-tests/src/invalid-json.test.ts
@@ -0,0 +1,23 @@
+import { describe, expect, it } from "bun:test";
+import { readFile } from "node:fs/promises";
+import { testOracleProgramExecution } from "@seda/dev-tools";
+
+const oracleProgram = await readFile(
+	"dist/libs/as-sdk-integration-tests/debug.wasm",
+);
+
+describe("invalid json", () => {
+	describe("invalid attribute", () => {
+		it("should mention the mismatched type", async () => {
+			const result = await testOracleProgramExecution(
+				oracleProgram,
+				Buffer.from("testInvalidAttribute"),
+			);
+
+			expect(result.exitCode).toBe(255);
+			expect(result.stderr).toContain(
+				"Mismatched Types! Expected string but got",
+			);
+		});
+	});
+});
diff --git a/libs/as-sdk/assembly/bytes.ts b/libs/as-sdk/assembly/bytes.ts
index 2e26d6d..03c5baf 100644
--- a/libs/as-sdk/assembly/bytes.ts
+++ b/libs/as-sdk/assembly/bytes.ts
@@ -71,6 +71,23 @@ export class Bytes {
 		return true;
 	}
 
+	/**
+	 * @hidden Required for JSON-AS (de)serialization.
+	 */
+	__DESERIALIZE_SAFE(
+		data: string,
+		_key_start: i32,
+		_key_end: i32,
+		_outerLoopIndex: i32,
+		_numberValueIndex: i32,
+	): bool {
+		const innerBytes = JSON.parseSafe<InnerBytes>(data);
+		const buffer = decodeHex(innerBytes.value);
+		this.value = buffer;
+
+		return true;
+	}
+
 	/**
 	 * The underlying {@link ArrayBuffer} in case you need to manipulate it directly.
 	 * Most likely {@linkcode toUtf8String} or {@linkcode toHexString} is the better choice.
@@ -288,7 +305,7 @@ export class Bytes {
 	 * @returns an instance of '@json' annotated class <T>
 	 */
 	toJSON<T>(): T {
-		return JSON.parse<T>(this.toUtf8String());
+		return JSON.parseSafe<T>(this.toUtf8String());
 	}
 
 	/**
diff --git a/libs/as-sdk/package.json b/libs/as-sdk/package.json
index f42c6d7..e566445 100644
--- a/libs/as-sdk/package.json
+++ b/libs/as-sdk/package.json
@@ -1,12 +1,12 @@
 {
 	"name": "@seda-protocol/as-sdk",
 	"type": "module",
-	"version": "0.0.15",
+	"version": "0.0.16",
 	"types": "./assembly/index.ts",
 	"dependencies": {
 		"@assemblyscript/wasi-shim": "git+https://github.com/sedaprotocol/wasi-shim.git",
 		"as-bignum": "^0.3.1",
-		"json-as": "^0.9.6",
+		"json-as": "^0.9.26",
 		"visitor-as": "^0.11.4"
 	}
 }
diff --git a/package.json b/package.json
index 73b253e..dc68555 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
 		"cosmjs-types": "^0.9.0",
 		"dotenv": "^16.3.1",
 		"figlet": "^1.6.0",
-		"json-as": "0.9.6",
+		"json-as": "0.9.26",
 		"node-fetch": "^3.3.2",
 		"node-gzip": "^1.1.2",
 		"ora": "^7.0.1",