diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b71c594..757689f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -131,8 +131,8 @@ jobs:
           case "${{ matrix.pm }}" in
             npm) npm ci ;;
             pnpm) pnpm install --no-frozen-lockfile ;;
-            # --ignore-engines required for Node 18 compat with some devDependencies (e.g., markdownlint-cli)
-            yarn) yarn install --ignore-engines ;;
+            # Yarn Berry (v4+) removed --ignore-engines; engine checking is no longer a core feature
+            yarn) yarn install ;;
             bun) bun install ;;
             *) echo "Unsupported package manager: ${{ matrix.pm }}" && exit 1 ;;
           esac
diff --git a/.github/workflows/reusable-test.yml b/.github/workflows/reusable-test.yml
index e0fdc4fc..de55605c 100644
--- a/.github/workflows/reusable-test.yml
+++ b/.github/workflows/reusable-test.yml
@@ -121,7 +121,8 @@ jobs:
           case "${{ inputs.package-manager }}" in
             npm) npm ci ;;
             pnpm) pnpm install --no-frozen-lockfile ;;
-            yarn) yarn install --ignore-engines ;;
+            # Yarn Berry (v4+) removed --ignore-engines; engine checking is no longer a core feature
+            yarn) yarn install ;;
             bun) bun install ;;
             *) echo "Unsupported package manager: ${{ inputs.package-manager }}" && exit 1 ;;
           esac