diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index dfe2c1c..dbe0290 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,7 +26,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '16.x'
+          node-version: '20.x'
           cache: 'yarn'
           cache-dependency-path: ui/yarn.lock
 
diff --git a/Dockerfile b/Dockerfile
index 1517ff7..8a0627c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 
 ### Build frontend
 # Due to no official elm compiler for arm; build frontend with amd64.
-FROM --platform=linux/amd64 node:18 as frontend
+FROM --platform=linux/amd64 node:20 as frontend
 RUN npm install -g node-gyp
 WORKDIR /build
 COPY . .
diff --git a/etc/dev-start.sh b/etc/dev-start.sh
index 0d8fc89..4be9449 100755
--- a/etc/dev-start.sh
+++ b/etc/dev-start.sh
@@ -29,7 +29,7 @@ fi
 index="$INBUCKET_WEB_UIDIR/index.html"
 if ! test -f "$index"; then
   echo "$index does not exist!" >&2
-  echo "Run 'npm run build' from the 'ui' directory." >&2
+  echo "Run 'yarn build' from the 'ui' directory." >&2
   exit 1
 fi
 
diff --git a/shell.nix b/shell.nix
index 9f11452..dcd1f31 100644
--- a/shell.nix
+++ b/shell.nix
@@ -25,7 +25,7 @@ pkgs.mkShell {
     go_1_21
     golint
     gopls
-    nodejs_18
+    nodejs_20
     nodePackages.node-gyp
     nodePackages.yarn
     rpm
diff --git a/ui/package.json b/ui/package.json
index a959750..38cccc3 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "inbucket-ui",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "license": "MIT",
   "private": true,
   "scripts": {