diff --git a/.github/workflows/ci_run.yml b/.github/workflows/ci_run.yml
index 4931e1a..6574c45 100644
--- a/.github/workflows/ci_run.yml
+++ b/.github/workflows/ci_run.yml
@@ -368,9 +368,13 @@ jobs:
     # Setup pnpm (required by scenario tests)
     - name: "EXEC: {Setup pnpm}, independent"
       if: steps.start_cluster.outcome == 'success'
-      uses: pnpm/action-setup@v6
-      with:
-        version: latest
+      # TEMPORARY work-around pending solution to https://github.com/pnpm/action-setup/issues/276.
+      # Bypass pnpm/action-setup's broken 11.7.0 -> 11.12.0 self-update and
+      # the incomplete @pnpm/exe 11.12.0 platform packages. Node is set up
+      # above, so install the regular Node-based pnpm package directly.
+      run: |
+        npm install --global pnpm@11.12.0
+        test "$(pnpm --version)" = "11.12.0"
 
     # Validate schema using zod
     - name: "CHECK: {Validate devnet-info.json schema}"