diff --git a/.github/workflows/changeset-check.yml b/.github/workflows/changeset-check.yml
index bac0612..bf8552e 100644
--- a/.github/workflows/changeset-check.yml
+++ b/.github/workflows/changeset-check.yml
@@ -26,7 +26,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ae9f127..d4d97db 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
@@ -75,7 +75,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
index 9a37894..c964dc9 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/e2e.yml
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/lighthouse.yml b/.github/workflows/lighthouse.yml
index 97aee2a..a7678f5 100644
--- a/.github/workflows/lighthouse.yml
+++ b/.github/workflows/lighthouse.yml
@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index 7f630da..4ee2857 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1ff6f62..f1aa5c7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -25,7 +25,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index 51cf914..44b65c4 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -59,7 +59,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/storybook.yml b/.github/workflows/storybook.yml
index dc7ed72..af30d3d 100644
--- a/.github/workflows/storybook.yml
+++ b/.github/workflows/storybook.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       - name: Install
diff --git a/.github/workflows/supply-chain.yml b/.github/workflows/supply-chain.yml
index eba3aa2..2c58b9d 100644
--- a/.github/workflows/supply-chain.yml
+++ b/.github/workflows/supply-chain.yml
@@ -54,7 +54,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 26
           cache: npm
 
       # Production-only install so the SBOM reflects what actually ships,
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 925b61d..0be7792 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,5 +1,5 @@
 # --- builder ---
-FROM node:20-slim AS builder
+FROM node:26-slim AS builder
 WORKDIR /app
 COPY package.json tsconfig.json ./
 RUN npm install
@@ -7,7 +7,7 @@ COPY src ./src
 RUN npm run build
 
 # --- runtime (HTTP API only; Puppeteer runs in the dedicated worker image) ---
-FROM node:20-slim
+FROM node:26-slim
 ENV NODE_ENV=production \
     PUPPETEER_SKIP_DOWNLOAD=true
 
diff --git a/backend/Dockerfile.worker b/backend/Dockerfile.worker
index 244e276..97f9491 100644
--- a/backend/Dockerfile.worker
+++ b/backend/Dockerfile.worker
@@ -1,5 +1,5 @@
 # --- builder ---
-FROM node:20-slim AS builder
+FROM node:26-slim AS builder
 WORKDIR /app
 COPY package.json tsconfig.json ./
 RUN npm install
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 36f293c..def8cc2 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -1,9 +1,9 @@
-FROM node:20-slim AS deps
+FROM node:26-slim AS deps
 WORKDIR /app
 COPY package.json ./
 RUN npm install
 
-FROM node:20-slim AS builder
+FROM node:26-slim AS builder
 WORKDIR /app
 ARG NEXT_PUBLIC_API_URL
 ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
@@ -11,7 +11,7 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 RUN npm run build
 
-FROM node:20-slim
+FROM node:26-slim
 WORKDIR /app
 ENV NODE_ENV=production