diff --git a/.gitignore b/.gitignore
index 1552928..cd87059 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /lib
 /npm
 .DS_Store
+node_modules
diff --git a/deno.json b/deno.json
index 6f20760..7c15631 100644
--- a/deno.json
+++ b/deno.json
@@ -1,15 +1,13 @@
 {
-  "metadata": {
-    "minDenoVersion": "1.37",
-    "name": "hello_deno",
-    "version": "1.1.1"
-  },
+  "minDenoVersion": "1.41",
+  "name": "hello_deno",
+  "version": "1.2.0"
   "include": ["**/*"],
   "exclude": ["vendor/*"],
   "vendor": true,
   "lock": true,
   "imports": {
-    "std/": "https://deno.land/std@0.182.0/",
-    "fun/": "https://deno.land/x/fun/"
+    "effect": "npm:effect",
+    "std/": "https://deno.land/std@0.217.0/"
   }
 }
diff --git a/deno.lock b/deno.lock
index 50c7a39..3b72a4a 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,5 +1,16 @@
 {
   "version": "3",
+  "packages": {
+    "specifiers": {
+      "npm:effect": "npm:effect@2.4.0"
+    },
+    "npm": {
+      "effect@2.4.0": {
+        "integrity": "sha512-HAtFVAbAGYDzfGbrSrX1gzMzXym15zk1+ps72X8W1wdZY0vxq+u23w8u9DhAZjiJPHT4W9ZYL7QWQqpP4t+dSg==",
+        "dependencies": {}
+      }
+    }
+  },
   "redirects": {
     "https://deno.land/std/assert/mod.ts": "https://deno.land/std@0.205.0/assert/mod.ts",
     "https://deno.land/x/dnt/mod.ts": "https://deno.land/x/dnt@0.38.1/mod.ts",
@@ -214,5 +225,10 @@
     "https://deno.land/x/ts_morph@18.0.0/common/typescript.js": "d5c598b6a2db2202d0428fca5fd79fc9a301a71880831a805d778797d2413c59",
     "https://deno.land/x/wasmbuild@0.15.0/cache.ts": "89eea5f3ce6035a1164b3e655c95f21300498920575ade23161421f5b01967f4",
     "https://deno.land/x/wasmbuild@0.15.0/loader.ts": "d98d195a715f823151cbc8baa3f32127337628379a02d9eb2a3c5902dbccfc02"
+  },
+  "workspace": {
+    "dependencies": [
+      "npm:effect"
+    ]
   }
 }
diff --git a/hello.ts b/hello.ts
index f019927..c39977b 100644
--- a/hello.ts
+++ b/hello.ts
@@ -1,4 +1,4 @@
-import { toUpperCase } from "fun/string.ts";
+import { toUpperCase } from "npm:effect/String";
 
 export function hello_deno() {
   return toUpperCase("Hello deno!");