diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index a45f392e..c565ddef 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -109,7 +109,14 @@ jobs:
           cache: pnpm
 
       - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+        run: |
+          changed="$(git diff --name-only "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}")"
+          manifest_pattern='(^|/)package\.json$|^pnpm-workspace\.yaml$|^\.npmrc$|^pnpmfile\.(cjs|js|mjs)$'
+          if printf '%s\n' "$changed" | grep -Eq "$manifest_pattern"; then
+            pnpm install --no-frozen-lockfile
+          else
+            pnpm install --frozen-lockfile
+          fi
 
       - name: Typecheck
         run: pnpm -r typecheck
@@ -147,7 +154,14 @@ jobs:
           cache: pnpm
 
       - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+        run: |
+          changed="$(git diff --name-only "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}")"
+          manifest_pattern='(^|/)package\.json$|^pnpm-workspace\.yaml$|^\.npmrc$|^pnpmfile\.(cjs|js|mjs)$'
+          if printf '%s\n' "$changed" | grep -Eq "$manifest_pattern"; then
+            pnpm install --no-frozen-lockfile
+          else
+            pnpm install --frozen-lockfile
+          fi
 
       - name: Build
         run: pnpm build