diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b45e544..7103da86 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,9 +52,7 @@ jobs:
             ${{ runner.os }}-bun-
 
       - name: Ensure dependencies
-        run: |
-          [ -d node_modules ] || bun install --frozen-lockfile
-          [ -d ui/node_modules ] || (cd ui && bun install --frozen-lockfile)
+        run: bash scripts/ensure-deps.sh
 
       - name: Run ${{ matrix.check.name }}
         run: ${{ matrix.check.cmd }}
@@ -88,9 +86,7 @@ jobs:
             ${{ runner.os }}-bun-
 
       - name: Ensure dependencies
-        run: |
-          [ -d node_modules ] || bun install --frozen-lockfile
-          [ -d ui/node_modules ] || (cd ui && bun install --frozen-lockfile)
+        run: bash scripts/ensure-deps.sh
 
       - name: Build
         run: bun run build:all
@@ -133,9 +129,7 @@ jobs:
             ${{ runner.os }}-bun-
 
       - name: Ensure dependencies
-        run: |
-          [ -d node_modules ] || bun install --frozen-lockfile
-          [ -d ui/node_modules ] || (cd ui && bun install --frozen-lockfile)
+        run: bash scripts/ensure-deps.sh
 
       - name: Download dist artifact
         uses: actions/download-artifact@v4
diff --git a/.github/workflows/dev-release.yml b/.github/workflows/dev-release.yml
index e048677e..cf9f59d7 100644
--- a/.github/workflows/dev-release.yml
+++ b/.github/workflows/dev-release.yml
@@ -41,9 +41,7 @@ jobs:
           registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies
-        run: |
-          bun install --frozen-lockfile
-          cd ui && bun install --frozen-lockfile
+        run: bash scripts/ensure-deps.sh
 
       - name: Build
         run: bun run build:all
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5b0e2220..adb7a3e1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -37,9 +37,7 @@ jobs:
           bun-version: '1.3.9'
 
       - name: Install dependencies
-        run: |
-          bun install --frozen-lockfile
-          cd ui && bun install --frozen-lockfile
+        run: bash scripts/ensure-deps.sh
 
       - name: Build package
         run: bun run build:all
diff --git a/scripts/ensure-deps.sh b/scripts/ensure-deps.sh
new file mode 100644
index 00000000..77a0914e
--- /dev/null
+++ b/scripts/ensure-deps.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+UI_DIR="$ROOT_DIR/ui"
+UI_SENTINEL="$UI_DIR/node_modules/@date-fns/tz/date/mini.js"
+
+ensure_root_deps() {
+  if [[ ! -d "$ROOT_DIR/node_modules" ]]; then
+    echo "[deps] Installing root dependencies"
+    (cd "$ROOT_DIR" && bun install --frozen-lockfile)
+  fi
+}
+
+ensure_ui_deps() {
+  if [[ -d "$UI_DIR/node_modules" && -f "$UI_SENTINEL" ]]; then
+    return
+  fi
+
+  echo "[deps] Reinstalling UI dependencies"
+  rm -rf "$UI_DIR/node_modules"
+  (cd "$UI_DIR" && bun install --frozen-lockfile)
+}
+
+ensure_root_deps
+ensure_ui_deps