diff --git a/packages/utils/src/hash-password.test.ts b/packages/utils/src/hash-password.test.ts
index 3bd87f5..c89a863 100644
--- a/packages/utils/src/hash-password.test.ts
+++ b/packages/utils/src/hash-password.test.ts
@@ -13,8 +13,8 @@ describe("hashPassword", () => {
     expect(parts[1]).toBe("pbkdf2-sha256");
     expect(parts[2]).toBe("100000");
     // Salt and hash should be non-empty base64 strings
-    expect(parts[3].length).toBeGreaterThan(0);
-    expect(parts[4].length).toBeGreaterThan(0);
+    expect(parts[3]?.length).toBeGreaterThan(0);
+    expect(parts[4]?.length).toBeGreaterThan(0);
   });
 
   it("should generate different hashes for the same password", async () => {
@@ -98,4 +98,66 @@ describe("verifyPassword", () => {
     const wrongResult = await verifyPassword("password", hash);
     expect(wrongResult).toBe(false);
   });
+
+  it("should verify known hash for 'password'", async () => {
+    // This hash was generated for the password "password"
+    const storedHash =
+      "$pbkdf2-sha256$100000$iUaDbbVm+Mf0HG7RcCCOzw==$IQfBN4chRU3wqCEoC9XOusIVYkyW24dbJd/ksm0VBJk=";
+    const password = "password";
+
+    const result = await verifyPassword(password, storedHash);
+    expect(result).toBe(true);
+  });
+
+  it("should derive consistent hash for known salt and password", async () => {
+    // Manually verify the derivation produces the expected hash
+    const password = "password";
+    const saltB64 = "iUaDbbVm+Mf0HG7RcCCOzw==";
+    const expectedHashB64 = "IQfBN4chRU3wqCEoC9XOusIVYkyW24dbJd/ksm0VBJk=";
+    const iterations = 100000;
+
+    // Decode salt
+    const saltBinary = atob(saltB64);
+    const salt = new Uint8Array(saltBinary.length);
+    for (let i = 0; i < saltBinary.length; i++) {
+      salt[i] = saltBinary.charCodeAt(i);
+    }
+
+    // Derive key
+    const encoder = new TextEncoder();
+    const passwordBuffer = encoder.encode(password);
+
+    const keyMaterial = await crypto.subtle.importKey(
+      "raw",
+      passwordBuffer,
+      "PBKDF2",
+      false,
+      ["deriveBits"],
+    );
+
+    const derivedBits = await crypto.subtle.deriveBits(
+      {
+        name: "PBKDF2",
+        salt,
+        iterations,
+        hash: "SHA-256",
+      },
+      keyMaterial,
+      32 * 8,
+    );
+
+    // Encode result to base64
+    const derivedArray = new Uint8Array(derivedBits);
+    let binary = "";
+    for (const byte of derivedArray) {
+      binary += String.fromCharCode(byte);
+    }
+    const derivedB64 = btoa(binary);
+
+    console.log("Expected hash:", expectedHashB64);
+    console.log("Derived hash: ", derivedB64);
+    console.log("Match:", derivedB64 === expectedHashB64);
+
+    expect(derivedB64).toBe(expectedHashB64);
+  });
 });
diff --git a/packages/utils/src/hash-password.ts b/packages/utils/src/hash-password.ts
index 6cc26ba..08e8f13 100644
--- a/packages/utils/src/hash-password.ts
+++ b/packages/utils/src/hash-password.ts
@@ -107,6 +107,7 @@ export const verifyPassword = async (
   const derivedBits = await crypto.subtle.deriveBits(
     {
       name: "PBKDF2",
+      // @ts-expect-error - salt is a Uint8Array
       salt,
       iterations,
       hash: "SHA-256",
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
index fe0b870..4a1e2b2 100644
--- a/packages/utils/tsconfig.json
+++ b/packages/utils/tsconfig.json
@@ -1,7 +1,6 @@
 {
   "extends": "@macalinao/tsconfig/tsconfig.base.json",
   "compilerOptions": {
-    "types": ["@cloudflare/workers-types"]
-  },
-  "exclude": ["**/*.test.ts"]
+    "types": ["bun"]
+  }
 }