diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d0916d0..f45d56d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,6 +35,16 @@ jobs:
 
       - run: pnpm install --frozen-lockfile
 
+      # mermaid-export renders through puppeteer, which needs a real Chrome. The
+      # browser normally arrives via puppeteer's postinstall script, which does not
+      # run here, so eleven of its tests failed with "Could not find Chrome (ver. …)".
+      #
+      # Filtered to the one package that depends on puppeteer. A bare `pnpm exec` runs
+      # from the workspace root, where the binary does not exist, and fails with
+      # "Command \"puppeteer\" not found" before it reaches the package that has it.
+      - name: Install Chrome for puppeteer
+        run: pnpm --filter mermaid-export exec puppeteer browsers install chrome
+
       - name: Typecheck
         run: pnpm typecheck