diff --git a/.changeset/renovate-0860987.md b/.changeset/renovate-0860987.md
new file mode 100644
index 000000000..8e6354405
--- /dev/null
+++ b/.changeset/renovate-0860987.md
@@ -0,0 +1,5 @@
+---
+'@scaleway/use-growthbook': patch
+---
+
+Updated dependency `@growthbook/growthbook-react` to `1.2.1`.
diff --git a/packages/use-growthbook/package.json b/packages/use-growthbook/package.json
index 67fb0f3cb..109072162 100644
--- a/packages/use-growthbook/package.json
+++ b/packages/use-growthbook/package.json
@@ -41,7 +41,7 @@
     "feature flags"
   ],
   "dependencies": {
-    "@growthbook/growthbook-react": "1.2.0"
+    "@growthbook/growthbook-react": "1.2.1"
   },
   "devDependencies": {
     "react": "18.3.1"
diff --git a/packages/use-i18n/package.json b/packages/use-i18n/package.json
index 9fba480cd..55116f64b 100644
--- a/packages/use-i18n/package.json
+++ b/packages/use-i18n/package.json
@@ -43,7 +43,7 @@
     "build": "vite build --config vite.config.ts && pnpm run type:generate",
     "build:profile": "npx vite-bundle-visualizer -c vite.config.ts",
     "lint": "eslint --report-unused-disable-directives --cache --cache-strategy content --ext ts,tsx .",
-    "test:unit": "vitest --run --config vite.config.ts",
+    "test:unit": "TZ=UTC LANG=en_US.UTF8 NODE_ENV=test vitest --run --config vite.config.ts",
     "test:unit:coverage": "pnpm test:unit --coverage"
   },
   "dependencies": {
diff --git a/packages/use-i18n/src/usei18n.tsx b/packages/use-i18n/src/usei18n.tsx
index 0dc626ce6..b31152c3a 100644
--- a/packages/use-i18n/src/usei18n.tsx
+++ b/packages/use-i18n/src/usei18n.tsx
@@ -309,7 +309,7 @@ const I18nContextProvider = <LocalSupportedType extends string>({
       })
 
       const trad: Record<string, string> = {
-        ...result.defaultLocale?.default,
+        ...result.defaultLocale.default,
         ...result[currentLocale].default,
       }
 
@@ -317,7 +317,7 @@ const I18nContextProvider = <LocalSupportedType extends string>({
         ...prevState,
         [defaultLocale]: {
           ...prevState[defaultLocale],
-          ...result.defaultLocale?.default,
+          ...result.defaultLocale.default,
         },
         [currentLocale]: {
           ...prevState[currentLocale],
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d66a5e3d0..91d5a7f7c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -220,8 +220,8 @@ importers:
   packages/use-growthbook:
     dependencies:
       '@growthbook/growthbook-react':
-        specifier: 1.2.0
-        version: 1.2.0(react@18.3.1)
+        specifier: 1.2.1
+        version: 1.2.1(react@18.3.1)
     devDependencies:
       react:
         specifier: 18.3.1
@@ -1453,14 +1453,14 @@ packages:
   '@formatjs/intl-localematcher@0.5.5':
     resolution: {integrity: sha512-t5tOGMgZ/i5+ALl2/offNqAQq/lfUnKLEw0mXQI4N4bqpedhrSE+fyKLpwnd22sK0dif6AV+ufQcTsKShB9J1g==}
 
-  '@growthbook/growthbook-react@1.2.0':
-    resolution: {integrity: sha512-6VSs7n+B73ihfiPbUDHGBxPn6en3NNYGe5jSlMT22nBt+iWMNwOBzdnMgGGxDsQaVJ9oAcq8RXEC75w56tF8Hg==}
+  '@growthbook/growthbook-react@1.2.1':
+    resolution: {integrity: sha512-IMJfOQyeLnZoX+CiGPxQ19vzYDs5uugWB0WdQRnzx6Cy0GxbpK30+EbjaHNt5enVDjdpBorOROvCbYM9qb26/A==}
     engines: {node: '>=10'}
     peerDependencies:
       react: ^16.8.0-0 || ^17.0.0-0 || ^18.0.0-0
 
-  '@growthbook/growthbook@1.2.0':
-    resolution: {integrity: sha512-lL47UKvzUaUq2QLwiePrUbM/p+NPv6WUGrGs2bjw1Zc51dtNtxAD+s1hXEU9wpAF913kbiOW2+yRa67UhxSkuw==}
+  '@growthbook/growthbook@1.2.1':
+    resolution: {integrity: sha512-V0of0mGXZ69poOTPoZ8TFkJkPpC9T766NZiJ1qwzwFAl8ZsuunmguC6RP4muri4q5DRPDzf3lRUSWLk0g8bdbw==}
     engines: {node: '>=10'}
 
   '@humanfs/core@0.19.0':
@@ -5716,12 +5716,12 @@ snapshots:
     dependencies:
       tslib: 2.7.0
 
-  '@growthbook/growthbook-react@1.2.0(react@18.3.1)':
+  '@growthbook/growthbook-react@1.2.1(react@18.3.1)':
     dependencies:
-      '@growthbook/growthbook': 1.2.0
+      '@growthbook/growthbook': 1.2.1
       react: 18.3.1
 
-  '@growthbook/growthbook@1.2.0':
+  '@growthbook/growthbook@1.2.1':
     dependencies:
       dom-mutator: 0.6.0