diff --git a/Dockerfile b/Dockerfile
index 0ce717d8..4cb70223 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ COPY ./frontend/apps/remark42/package.json /srv/frontend/apps/remark42/
 RUN \
   if [[ -z "$SKIP_FRONTEND_BUILD" || -z "$SKIP_FRONTEND_TEST" ]]; then \
     apk add --no-cache --update git && \
-    npm i -g pnpm@10; \
+    npm i -g pnpm@10.10.0; \
   fi
 
 RUN --mount=type=cache,id=pnpm,target=/root/.pnpm-store/v3 \
diff --git a/frontend/apps/remark42/package.json b/frontend/apps/remark42/package.json
index 5a090eca..a26261ba 100644
--- a/frontend/apps/remark42/package.json
+++ b/frontend/apps/remark42/package.json
@@ -22,8 +22,8 @@
     "translation:check": "node ./tasks/checkTranslation.js"
   },
   "engines": {
-    "node": ">=16.15",
-    "pnpm": ">=8"
+    "node": ">=18",
+    "pnpm": ">=10"
   },
   "packageManager": "pnpm@10.10.0",
   "dependencies": {
diff --git a/frontend/packages/api/tests/test-utils.ts b/frontend/packages/api/tests/test-utils.ts
index 8fde3050..2ee76473 100644
--- a/frontend/packages/api/tests/test-utils.ts
+++ b/frontend/packages/api/tests/test-utils.ts
@@ -41,7 +41,11 @@ export function mockEndpoint(
 			const responseHeaders = new Headers()
 			if (headers) {
 				for (const [key, value] of Object.entries(headers)) {
-					responseHeaders.set(key, Array.isArray(value) ? value.join(', ') : value)
+					if (Array.isArray(value)) {
+						for (const v of value) responseHeaders.append(key, v)
+					} else {
+						responseHeaders.set(key, value)
+					}
 				}
 			}