diff --git a/src/Layers/JSONWebToken.ts b/src/Layers/JSONWebToken.ts
index 0ee5d14..24bf772 100644
--- a/src/Layers/JSONWebToken.ts
+++ b/src/Layers/JSONWebToken.ts
@@ -1,12 +1,12 @@
 import { Context, Effect, Layer } from "effect"
-import jwt from "jsonwebtoken"
+import type * as JWT from "jsonwebtoken"
 
 
 export class JSONWebToken extends Context.Tag("JSONWebToken")<JSONWebToken, {
     sign: (
         payload:             string | object | Buffer,
-        secretOrPrivateKey:  jwt.Secret,
-        options:             jwt.SignOptions,
+        secretOrPrivateKey:  JWT.Secret,
+        options:             JWT.SignOptions,
     ) => Effect.Effect<
         string,
         Error,
@@ -15,32 +15,39 @@ export class JSONWebToken extends Context.Tag("JSONWebToken")<JSONWebToken, {
 
     verify: (
         token:              string,
-        secretOrPublicKey:  jwt.Secret,
-        options:            jwt.VerifyOptions,
+        secretOrPublicKey:  JWT.Secret,
+        options:            JWT.VerifyOptions,
     ) => Effect.Effect<
-        string | jwt.Jwt | jwt.JwtPayload,
-        jwt.VerifyErrors | Error,
+        string | JWT.Jwt | JWT.JwtPayload,
+        JWT.VerifyErrors | Error,
         never
     >,
 }>() {}
 
 
-export const JSONWebTokenLive = Layer.succeed(JSONWebToken, {
-    sign: (payload, secretOrPrivateKey, options) => Effect.async(resume =>
-        jwt.sign(payload, secretOrPrivateKey, options, (err, token) => {
-            resume(token
-                ? Effect.succeed(token)
-                : Effect.fail(err || new Error("Unknown error"))
-            )
-        })
-    ),
-
-    verify: (token, secretOrPublicKey, options) => Effect.async(resume =>
-        jwt.verify(token, secretOrPublicKey, options, (err, decoded) => {
-            resume(decoded
-                ? Effect.succeed(decoded)
-                : Effect.fail(err || new Error("Unknown error"))
-            )
-        })
-    ),
+const importJWT = Effect.tryPromise({
+    try: () => import("jsonwebtoken"),
+    catch: cause => new Error("Could not import 'jsonwebtoken'. Make sure it is installed.", { cause }),
 })
+
+export const JSONWebTokenLive = Layer.effect(JSONWebToken, importJWT.pipe(
+    Effect.map(jwt => JSONWebToken.of({
+        sign: (payload, secretOrPrivateKey, options) => Effect.async(resume =>
+            jwt.sign(payload, secretOrPrivateKey, options, (err, token) => {
+                resume(token
+                    ? Effect.succeed(token)
+                    : Effect.fail(err || new Error("Unknown error"))
+                )
+            })
+        ),
+
+        verify: (token, secretOrPublicKey, options) => Effect.async(resume =>
+            jwt.verify(token, secretOrPublicKey, options, (err, decoded) => {
+                resume(decoded
+                    ? Effect.succeed(decoded)
+                    : Effect.fail(err || new Error("Unknown error"))
+                )
+            })
+        ),
+    }))
+))