diff --git a/optuna_dashboard/package-lock.json b/optuna_dashboard/package-lock.json
index 0513b6c2..247fb1cf 100644
--- a/optuna_dashboard/package-lock.json
+++ b/optuna_dashboard/package-lock.json
@@ -72,14 +72,13 @@
         "@mui/lab": "^5.0.0-alpha.170",
         "@mui/material": "^5.15.10",
         "@mui/system": "^5.15.9",
-        "@optuna/storage": "file:../storage",
         "@tanstack/react-table": "^8.17.3",
         "plotly.js-dist-min": "^2.30.1",
         "react": "^18.2.0",
-        "react-dom": "^18.2.0",
-        "recoil": "^0.7.7"
+        "react-dom": "^18.2.0"
       },
       "devDependencies": {
+        "@optuna/storage": "file:../storage",
         "@optuna/types": "file:../types",
         "@storybook/addon-essentials": "^8.0.4",
         "@storybook/addon-interactions": "^8.0.4",
@@ -7185,10 +7184,6 @@
         "gunzip-maybe": "bin.js"
       }
     },
-    "../tslib/react/node_modules/hamt_plus": {
-      "version": "1.0.2",
-      "license": "MIT"
-    },
     "../tslib/react/node_modules/handlebars": {
       "version": "4.7.8",
       "dev": true,
@@ -9943,24 +9938,6 @@
       "dev": true,
       "license": "0BSD"
     },
-    "../tslib/react/node_modules/recoil": {
-      "version": "0.7.7",
-      "license": "MIT",
-      "dependencies": {
-        "hamt_plus": "1.0.2"
-      },
-      "peerDependencies": {
-        "react": ">=16.13.1"
-      },
-      "peerDependenciesMeta": {
-        "react-dom": {
-          "optional": true
-        },
-        "react-native": {
-          "optional": true
-        }
-      }
-    },
     "../tslib/react/node_modules/redent": {
       "version": "3.0.0",
       "dev": true,
@@ -12088,6 +12065,7 @@
     "../tslib/storage": {
       "name": "@optuna/storage",
       "version": "0.0.1",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@sqlite.org/sqlite-wasm": "^3.45.1-build1"
@@ -12103,6 +12081,7 @@
     },
     "../tslib/storage/node_modules/@sqlite.org/sqlite-wasm": {
       "version": "3.45.1-build1",
+      "dev": true,
       "license": "Apache-2.0",
       "bin": {
         "sqlite-wasm": "bin/index.js"
diff --git a/standalone_app/package-lock.json b/standalone_app/package-lock.json
index 67c7ef31..9ee8c8d7 100644
--- a/standalone_app/package-lock.json
+++ b/standalone_app/package-lock.json
@@ -56,14 +56,13 @@
         "@mui/lab": "^5.0.0-alpha.170",
         "@mui/material": "^5.15.10",
         "@mui/system": "^5.15.9",
-        "@optuna/storage": "file:../storage",
         "@tanstack/react-table": "^8.17.3",
         "plotly.js-dist-min": "^2.30.1",
         "react": "^18.2.0",
-        "react-dom": "^18.2.0",
-        "recoil": "^0.7.7"
+        "react-dom": "^18.2.0"
       },
       "devDependencies": {
+        "@optuna/storage": "file:../storage",
         "@optuna/types": "file:../types",
         "@storybook/addon-essentials": "^8.0.4",
         "@storybook/addon-interactions": "^8.0.4",
diff --git a/tslib/react/package-lock.json b/tslib/react/package-lock.json
index 1ef5fac4..a0ef388c 100644
--- a/tslib/react/package-lock.json
+++ b/tslib/react/package-lock.json
@@ -15,14 +15,13 @@
         "@mui/lab": "^5.0.0-alpha.170",
         "@mui/material": "^5.15.10",
         "@mui/system": "^5.15.9",
-        "@optuna/storage": "file:../storage",
         "@tanstack/react-table": "^8.17.3",
         "plotly.js-dist-min": "^2.30.1",
         "react": "^18.2.0",
-        "react-dom": "^18.2.0",
-        "recoil": "^0.7.7"
+        "react-dom": "^18.2.0"
       },
       "devDependencies": {
+        "@optuna/storage": "file:../storage",
         "@optuna/types": "file:../types",
         "@storybook/addon-essentials": "^8.0.4",
         "@storybook/addon-interactions": "^8.0.4",
@@ -47,6 +46,7 @@
     "../storage": {
       "name": "@optuna/storage",
       "version": "0.0.1",
+      "dev": true,
       "license": "MIT",
       "dependencies": {
         "@sqlite.org/sqlite-wasm": "^3.45.1-build1"
@@ -8409,11 +8409,6 @@
         "gunzip-maybe": "bin.js"
       }
     },
-    "node_modules/hamt_plus": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/hamt_plus/-/hamt_plus-1.0.2.tgz",
-      "integrity": "sha512-t2JXKaehnMb9paaYA7J0BX8QQAY8lwfQ9Gjf4pg/mk4krt+cmwmU652HOoWonf+7+EQV97ARPMhhVgU1ra2GhA=="
-    },
     "node_modules/handlebars": {
       "version": "4.7.8",
       "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.8.tgz",
@@ -11430,25 +11425,6 @@
       "integrity": "sha512-xNvxJEOUiWPGhUuUdQgAJPKOOJfGnIyKySOc09XkKsgdUV/3E2zvwZYdejjmRgPCgcym1juLH3226yA7sEFJKQ==",
       "dev": true
     },
-    "node_modules/recoil": {
-      "version": "0.7.7",
-      "resolved": "https://registry.npmjs.org/recoil/-/recoil-0.7.7.tgz",
-      "integrity": "sha512-8Og5KPQW9LwC577Vc7Ug2P0vQshkv1y3zG3tSSkWMqkWSwHmE+by06L8JtnGocjW6gcCvfwB3YtrJG6/tWivNQ==",
-      "dependencies": {
-        "hamt_plus": "1.0.2"
-      },
-      "peerDependencies": {
-        "react": ">=16.13.1"
-      },
-      "peerDependenciesMeta": {
-        "react-dom": {
-          "optional": true
-        },
-        "react-native": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/redent": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
diff --git a/tslib/react/package.json b/tslib/react/package.json
index cbb072c8..bb920b8c 100644
--- a/tslib/react/package.json
+++ b/tslib/react/package.json
@@ -32,15 +32,14 @@
     "@mui/lab": "^5.0.0-alpha.170",
     "@mui/material": "^5.15.10",
     "@mui/system": "^5.15.9",
-    "@optuna/storage": "file:../storage",
     "@tanstack/react-table": "^8.17.3",
     "plotly.js-dist-min": "^2.30.1",
     "react": "^18.2.0",
-    "react-dom": "^18.2.0",
-    "recoil": "^0.7.7"
+    "react-dom": "^18.2.0"
   },
   "devDependencies": {
     "@optuna/types": "file:../types",
+    "@optuna/storage": "file:../storage",
     "@storybook/addon-essentials": "^8.0.4",
     "@storybook/addon-interactions": "^8.0.4",
     "@storybook/addon-links": "^8.0.4",
diff --git a/tslib/react/src/utils/loadStorageFromFile.ts b/tslib/react/test/loadStorageFromFile.ts
similarity index 94%
rename from tslib/react/src/utils/loadStorageFromFile.ts
rename to tslib/react/test/loadStorageFromFile.ts
index eac68ac4..abc298b9 100644
--- a/tslib/react/src/utils/loadStorageFromFile.ts
+++ b/tslib/react/test/loadStorageFromFile.ts
@@ -1,6 +1,7 @@
 import { JournalFileStorage, SQLite3Storage } from "@optuna/storage"
 import * as Optuna from "@optuna/types"
-import { SetterOrUpdater } from "recoil"
+
+type SetterOrUpdater<T> = (valOrUpdater: ((currVal: T) => T) | T) => void
 
 const readFile = async (file: File) => {
   return new Promise<ArrayBuffer>((resolve, reject) => {
diff --git a/tslib/react/test/setup_studies.ts b/tslib/react/test/setup_studies.ts
index e3c77059..905d448d 100644
--- a/tslib/react/test/setup_studies.ts
+++ b/tslib/react/test/setup_studies.ts
@@ -1,6 +1,6 @@
 import fs from "node:fs"
 import * as Optuna from "@optuna/types"
-import { loadStorageFromFile } from "../src/utils/loadStorageFromFile"
+import { loadStorageFromFile } from "./loadStorageFromFile"
 
 declare global {
   interface Window {