diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 4387c56..ea5d9a3 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -29,10 +29,9 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Setup Deno
-        # uses: denoland/setup-deno@v1
-        uses: denoland/setup-deno@9db7f66e8e16b5699a514448ce994936c63f0d54
+        uses: denoland/setup-deno
         with:
-          deno-version: v1.44.4
+          deno-version: v2.x
 
       - name: Release to JSR
         run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 22775ea..1297ba9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
       - name: Setup Deno
         uses: denoland/setup-deno@v1
         with:
-          deno-version: v1.x
+          deno-version: v2.x
       - name: Lint
         run: deno lint
 
diff --git a/deno.json b/deno.json
index 35faf07..8f09369 100644
--- a/deno.json
+++ b/deno.json
@@ -1,7 +1,7 @@
 {
   "minDenoVersion": "1.44",
   "name": "@tdd/hello-deno",
-  "version": "2.0.0-rc-0",
+  "version": "2.0.0",
   "tasks": {
     "install": "deno cache **/*.ts"
   },
@@ -14,7 +14,7 @@
   "vendor": true,
   "lock": true,
   "imports": {
-    "effect": "npm:effect@3.5.0",
+    "effect": "npm:effect@^3.12.1",
     "std/": "https://deno.land/std@0.217.0/"
   },
   "exports": {
diff --git a/deno.lock b/deno.lock
index 74f3dff..88ca525 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,27 +1,36 @@
 {
-  "version": "3",
-  "packages": {
-    "specifiers": {
-      "jsr:@std/assert": "jsr:@std/assert@0.226.0",
-      "jsr:@std/internal@^1.0.0": "jsr:@std/internal@1.0.0",
-      "npm:effect@3.5.0": "npm:effect@3.5.0"
+  "version": "4",
+  "specifiers": {
+    "jsr:@std/assert@*": "0.226.0",
+    "jsr:@std/internal@1": "1.0.0",
+    "npm:effect@^3.12.1": "3.12.1"
+  },
+  "jsr": {
+    "@std/assert@0.226.0": {
+      "integrity": "0dfb5f7c7723c18cec118e080fec76ce15b4c31154b15ad2bd74822603ef75b3",
+      "dependencies": [
+        "jsr:@std/internal"
+      ]
+    },
+    "@std/internal@1.0.0": {
+      "integrity": "ac6a6dfebf838582c4b4f61a6907374e27e05bedb6ce276e0f1608fe84e7cd9a"
+    }
+  },
+  "npm": {
+    "effect@3.12.1": {
+      "integrity": "sha512-aAZdh56Yp1ehOFYeMcHHctTtxfqm6kkOdZFTXK6Zf0QoaKKc1hPG6ocjrKOc0axE8JbG4eZw351ogNLrM4vo9w==",
+      "dependencies": [
+        "fast-check"
+      ]
     },
-    "jsr": {
-      "@std/assert@0.226.0": {
-        "integrity": "0dfb5f7c7723c18cec118e080fec76ce15b4c31154b15ad2bd74822603ef75b3",
-        "dependencies": [
-          "jsr:@std/internal@^1.0.0"
-        ]
-      },
-      "@std/internal@1.0.0": {
-        "integrity": "ac6a6dfebf838582c4b4f61a6907374e27e05bedb6ce276e0f1608fe84e7cd9a"
-      }
+    "fast-check@3.23.2": {
+      "integrity": "sha512-h5+1OzzfCC3Ef7VbtKdcv7zsstUQwUDlYpUTvjeUsJAssPgLn7QzbboPtL5ro04Mq0rPOsMzl7q5hIbRs2wD1A==",
+      "dependencies": [
+        "pure-rand"
+      ]
     },
-    "npm": {
-      "effect@3.5.0": {
-        "integrity": "sha512-q4JBEXYnFgbGsuxY03yUdkdMI7N2d2sMS93ulZle+a0M2Mt/rJv9xFDotkaxJILzYK2v6Uu5qJBOBJ0RD1OGCg==",
-        "dependencies": {}
-      }
+    "pure-rand@6.1.0": {
+      "integrity": "sha512-bVWawvoZoBYpp6yIoQtQXHZjmz35RSVHnUOTefl8Vcjr8snTPY1wnpSPMWekcFwbxI6gtmT7rSYPFvz71ldiOA=="
     }
   },
   "redirects": {
@@ -244,7 +253,7 @@
   },
   "workspace": {
     "dependencies": [
-      "npm:effect@3.5.0"
+      "npm:effect@^3.12.1"
     ]
   }
 }
diff --git a/flake.lock b/flake.lock
index 98c4a36..9f01d8a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1721116560,
-        "narHash": "sha256-++TYlGMAJM1Q+0nMVaWBSEvEUjRs7ZGiNQOpqbQApCU=",
+        "lastModified": 1736320768,
+        "narHash": "sha256-nIYdTAiKIGnFNugbomgBJR+Xv5F1ZQU+HfaBqJKroC0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9355fa86e6f27422963132c2c9aeedb0fb963d93",
+        "rev": "4bc9c909d9ac828a039f288cf872d16d38185db8",
         "type": "github"
       },
       "original": {