diff --git a/package.json b/package.json
index 2371a27..1de06e3 100644
--- a/package.json
+++ b/package.json
@@ -51,10 +51,9 @@
     ]
   },
   "dependencies": {
-    "jsbn": "^1.1.0"
+    "bigint-mod-arith": "^3.3.1"
   },
   "devDependencies": {
-    "@types/jsbn": "^1.2.33",
     "arraybuffer-equal": "^1.0.4",
     "microbundle": "^0.15.1",
     "prettier": "^3.2.5",
diff --git a/src/SRPInt.ts b/src/SRPInt.ts
index 3dc36a4..1186441 100644
--- a/src/SRPInt.ts
+++ b/src/SRPInt.ts
@@ -1,24 +1,26 @@
-import { BigInteger } from "jsbn";
+import { modPow } from "bigint-mod-arith";
 import { getRandomValues } from "./crypto";
 import { bufferToHex } from "./utils";
 
 const bi = Symbol("big-int");
 
+const WHITESPACE_RE = /\s+/g;
+
 export class SRPInt {
-  [bi]: BigInteger;
+  [bi]: bigint;
 
   constructor(
-    bigInt: BigInteger,
+    bigInt: bigint,
     public hexLength: number | null,
   ) {
     this[bi] = bigInt;
   }
 
-  static ZERO = new SRPInt(new BigInteger("0"), null);
+  static ZERO = new SRPInt(0n, null);
 
   static fromHex(hex: string): SRPInt {
-    const sanitized = hex.replace(/\s+/g, "").toLowerCase();
-    return new SRPInt(new BigInteger(sanitized, 16), sanitized.length);
+    const sanitized = hex.replace(WHITESPACE_RE, "");
+    return new SRPInt(BigInt(`0x${sanitized}`), sanitized.length);
   }
 
   static getRandom(bytes: number): SRPInt {
@@ -28,26 +30,27 @@ export class SRPInt {
   }
 
   add(value: SRPInt): SRPInt {
-    return new SRPInt(this[bi].add(value[bi]), null);
+    return new SRPInt(this[bi] + value[bi], null);
   }
 
   equals(value: SRPInt): boolean {
-    return this[bi].equals(value[bi]);
+    return this[bi] === value[bi];
   }
 
   mod(modulus: SRPInt): SRPInt {
-    return new SRPInt(this[bi].mod(modulus[bi]), modulus.hexLength);
+    return new SRPInt(this[bi] % modulus[bi], modulus.hexLength);
   }
 
   modPow(exponent: SRPInt, modulus: SRPInt): SRPInt {
-    return new SRPInt(
-      this[bi].modPow(exponent[bi], modulus[bi]),
-      modulus.hexLength,
-    );
+    const b = this[bi];
+    const e = exponent[bi];
+    const m = modulus[bi];
+
+    return new SRPInt(modPow(b, e, m), modulus.hexLength);
   }
 
   multiply(value: SRPInt): SRPInt {
-    return new SRPInt(this[bi].multiply(value[bi]), null);
+    return new SRPInt(this[bi] * value[bi], null);
   }
 
   pad(paddedHexLength: number): SRPInt {
@@ -59,7 +62,7 @@ export class SRPInt {
   }
 
   subtract(value: SRPInt): SRPInt {
-    return new SRPInt(this[bi].subtract(value[bi]), this.hexLength);
+    return new SRPInt(this[bi] - value[bi], this.hexLength);
   }
 
   toHex(): string {
@@ -71,6 +74,6 @@ export class SRPInt {
   }
 
   xor(value: SRPInt): SRPInt {
-    return new SRPInt(this[bi].xor(value[bi]), this.hexLength);
+    return new SRPInt(this[bi] ^ value[bi], this.hexLength);
   }
 }
diff --git a/src/hash.ts b/src/hash.ts
index bcfe217..b95ded4 100644
--- a/src/hash.ts
+++ b/src/hash.ts
@@ -7,9 +7,12 @@ export const hash = async (
   hashAlgorithm: HashAlgorithm,
   ...input: (SRPInt | string)[]
 ) => {
-  const buffers = input.map((item) =>
-    typeof item === "string" ? encodeUtf8(item) : hexToBuffer(item.toHex()),
-  );
+  const buffers = input.map((item) => {
+    if (typeof item === "string") {
+      return encodeUtf8(item);
+    }
+    return hexToBuffer(item.toHex());
+  });
 
   const combined = new Uint8Array(
     buffers.reduce((offset, item) => offset + item.byteLength, 0),
diff --git a/tsconfig.json b/tsconfig.json
index de16a1e..a60081e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,9 +1,9 @@
 {
   "include": ["src/**/*"],
   "compilerOptions": {
-    "module": "ES2015",
-    "target": "ES2015",
-    "lib": ["ES2015", "DOM"],
+    "module": "ES2020",
+    "target": "ES2020",
+    "lib": ["ES2020", "DOM"],
     "moduleResolution": "Node",
     "outDir": "dist/",
 
diff --git a/yarn.lock b/yarn.lock
index e2d2fb4..52d1b9c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1347,11 +1347,6 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
   integrity sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==
 
-"@types/jsbn@^1.2.33":
-  version "1.2.33"
-  resolved "https://registry.yarnpkg.com/@types/jsbn/-/jsbn-1.2.33.tgz#470a4ff059f40fa6ca59838a8fa3f30c62a8c5ac"
-  integrity sha512-ZlLkHfu8xqqVFSbCe1FSPtAMUs7LKxk7TPskMb+sI5IbuzqyVqIEt9SVaQfFD2vrFcQunqKAmEBOuBEkoNLw4g==
-
 "@types/node@*":
   version "20.11.23"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-20.11.23.tgz#5c156571ccb4200a2408084f472e1927d719c01e"
@@ -1570,6 +1565,11 @@ balanced-match@^1.0.0:
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
   integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
+bigint-mod-arith@^3.3.1:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/bigint-mod-arith/-/bigint-mod-arith-3.3.1.tgz#8ed33dc9f7886e552a7d47c239e051836e74cfa8"
+  integrity sha512-pX/cYW3dCa87Jrzv6DAr8ivbbJRzEX5yGhdt8IutnX/PCIXfpx+mabWNK/M8qqh+zQ0J3thftUBHW0ByuUlG0w==
+
 boolbase@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
@@ -2659,11 +2659,6 @@ js-tokens@^8.0.2:
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-8.0.3.tgz#1c407ec905643603b38b6be6977300406ec48775"
   integrity sha512-UfJMcSJc+SEXEl9lH/VLHSZbThQyLpw1vLO1Lb+j4RWDvG3N2f7yj3PVQA3cmkTBNldJ9eFnM+xEXxHIXrYiJw==
 
-jsbn@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-1.1.0.tgz#b01307cb29b618a1ed26ec79e911f803c4da0040"
-  integrity sha512-4bYVV3aAMtDTTu4+xsDYa6sy9GyJ69/amsu9sYF2zqjiEoZA5xJi3BrfX3uY+/IekIu7MwdObdbDWpoZdBv3/A==
-
 jsesc@^2.5.1:
   version "2.5.2"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-2.5.2.tgz#80564d2e483dacf6e8ef209650a67df3f0c283a4"