diff --git a/examples/quickstart/client/src/module_bindings/message.ts b/examples/quickstart/client/src/module_bindings/message.ts
index 7791a4f..3cce384 100644
--- a/examples/quickstart/client/src/module_bindings/message.ts
+++ b/examples/quickstart/client/src/module_bindings/message.ts
@@ -23,10 +23,10 @@ export class Message extends DatabaseTable {
   public static db: ClientDB = __SPACETIMEDB__.clientDB;
   public static tableName = "Message";
   public sender: Identity;
-  public sent: BigInt;
+  public sent: bigint;
   public text: string;
 
-  constructor(sender: Identity, sent: BigInt, text: string) {
+  constructor(sender: Identity, sent: bigint, text: string) {
     super();
     this.sender = sender;
     this.sent = sent;
diff --git a/src/algebraic_value.ts b/src/algebraic_value.ts
index cd2cb99..7694a64 100644
--- a/src/algebraic_value.ts
+++ b/src/algebraic_value.ts
@@ -63,10 +63,10 @@ export interface ValueAdapter {
   readU16: () => number;
   readI32: () => number;
   readU32: () => number;
-  readI64: () => BigInt;
-  readU64: () => BigInt;
-  readU128: () => BigInt;
-  readI128: () => BigInt;
+  readI64: () => bigint;
+  readU64: () => bigint;
+  readU128: () => bigint;
+  readI128: () => bigint;
   readF32: () => number;
   readF64: () => number;
 
@@ -161,16 +161,16 @@ export class BinaryAdapter implements ValueAdapter {
   readU32(): number {
     return this.reader.readU32();
   }
-  readI64(): BigInt {
+  readI64(): bigint {
     return this.reader.readI64();
   }
-  readU64(): BigInt {
+  readU64(): bigint {
     return this.reader.readU64();
   }
-  readU128(): BigInt {
+  readU128(): bigint {
     return this.reader.readU128();
   }
-  readI128(): BigInt {
+  readI128(): bigint {
     return this.reader.readI128();
   }
   readF32(): number {
@@ -281,16 +281,16 @@ export class JSONAdapter implements ValueAdapter {
   readU32(): number {
     return this.value;
   }
-  readI64(): BigInt {
+  readI64(): bigint {
     return this.value;
   }
-  readU64(): BigInt {
+  readU64(): bigint {
     return this.value;
   }
-  readU128(): BigInt {
+  readU128(): bigint {
     return this.value;
   }
-  readI128(): BigInt {
+  readI128(): bigint {
     return this.value;
   }
   readF32(): number {
@@ -305,10 +305,10 @@ export class JSONAdapter implements ValueAdapter {
 export class SumValue {
   /** A tag representing the choice of one variant of the sum type's variants. */
   public tag: number;
-  /** 
-  * Given a variant `Var(Ty)` in a sum type `{ Var(Ty), ... }`,
-  * this provides the `value` for `Ty`.
-  */
+  /**
+   * Given a variant `Var(Ty)` in a sum type `{ Var(Ty), ... }`,
+   * this provides the `value` for `Ty`.
+   */
   public value: AlgebraicValue;
 
   constructor(tag: number, value: AlgebraicValue) {
@@ -329,12 +329,12 @@ export class SumValue {
   }
 }
 
-/** 
-* A product value is made of a list of
-* "elements" / "fields" / "factors" of other `AlgebraicValue`s.
-*
-* The type of product value is a [product type](`ProductType`).
-*/
+/**
+ * A product value is made of a list of
+ * "elements" / "fields" / "factors" of other `AlgebraicValue`s.
+ *
+ * The type of product value is a [product type](`ProductType`).
+ */
 export class ProductValue {
   elements: AlgebraicValue[];
 
@@ -360,7 +360,7 @@ type BuiltinValueType =
   | string
   | number
   | AlgebraicValue[]
-  | BigInt
+  | bigint
   | Map<AlgebraicValue, AlgebraicValue>
   | Uint8Array;
 
@@ -430,8 +430,8 @@ export class BuiltinValue {
     return this.value as boolean;
   }
 
-  public asBigInt(): BigInt {
-    return this.value as BigInt;
+  public asBigInt(): bigint {
+    return this.value as bigint;
   }
 
   public asBoolean(): boolean {
@@ -529,7 +529,7 @@ export class AlgebraicValue {
     return (this.builtin as BuiltinValue).asBool();
   }
 
-  public asBigInt(): BigInt {
+  public asBigInt(): bigint {
     this.assertBuiltin();
     return (this.builtin as BuiltinValue).asBigInt();
   }
diff --git a/src/binary_reader.ts b/src/binary_reader.ts
index c68ae52..fb2a2d6 100644
--- a/src/binary_reader.ts
+++ b/src/binary_reader.ts
@@ -75,19 +75,19 @@ export default class BinaryReader {
     return value;
   }
 
-  readI64(): BigInt {
+  readI64(): bigint {
     const value = this.buffer.getBigInt64(this.offset, true);
     this.offset += 8;
     return value;
   }
 
-  readU64(): BigInt {
+  readU64(): bigint {
     const value = this.buffer.getBigUint64(this.offset, true);
     this.offset += 8;
     return value;
   }
 
-  readU128(): BigInt {
+  readU128(): bigint {
     const lowerPart = this.buffer.getBigUint64(this.offset, true);
     const upperPart = this.buffer.getBigUint64(this.offset + 8, true);
     this.offset += 16;
@@ -95,7 +95,7 @@ export default class BinaryReader {
     return (upperPart << BigInt(64)) + lowerPart;
   }
 
-  readI128(): BigInt {
+  readI128(): bigint {
     const lowerPart = this.buffer.getBigInt64(this.offset, true);
     const upperPart = this.buffer.getBigInt64(this.offset + 8, true);
     this.offset += 16;