diff --git a/npm_install.py b/npm_install.py
index b3fc20a..bf79caf 100644
--- a/npm_install.py
+++ b/npm_install.py
@@ -2148,15 +2148,13 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
                 
                 # Uninstall old Yarn 1.x
                 try:
-                    run(["npm", "uninstall", "-g", "yarn"], check=False,
-                        stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    subprocess.run(["npm", "uninstall", "-g", "yarn"], check=False)
                 except Exception:
                     pass
                 
                 # Clear cache
                 try:
-                    run(["npm", "cache", "clean", "--force"], check=False,
-                        stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    subprocess.run(["npm", "cache", "clean", "--force"], check=False)
                 except Exception:
                     pass
             
@@ -2232,9 +2230,9 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
                     if DEBUG:
                         print(f"   ⚠ 'yarn set version' failed: {e}")
             
-            # METHOD 3: npm install @yarnpkg/cli (yarn 4.x)
+            # METHOD 3: npm install @yarnpkg/cli (yarn 4.x) — run from /tmp to avoid reading workspace package.json with patch: entries
             try:
-                run(["npm", "install", "-g", "@yarnpkg/cli"], check=False)
+                subprocess.run(["npm", "install", "-g", "@yarnpkg/cli"], check=False, cwd="/tmp")
                 
                 if shutil.which("yarn"):
                     major = _get_yarn_major_version(["yarn"])
@@ -2251,15 +2249,14 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
             # First install yarn 1.x if not present
             if not shutil.which("yarn"):
                 try:
-                    run(["npm", "install", "-g", "yarn@1"], check=False)
+                    subprocess.run(["npm", "install", "-g", "yarn@1"], check=False, cwd="/tmp")
                 except Exception:
                     pass
             
             if shutil.which("yarn"):
                 try:
                     # Uninstall any global yarn 4.x first
-                    run(["npm", "uninstall", "-g", "@yarnpkg/cli"], check=False,
-                        stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                    subprocess.run(["npm", "uninstall", "-g", "@yarnpkg/cli"], check=False, cwd="/tmp")
                     
                     # yarn 1.x can upgrade itself to 4.x
                     result = subprocess.run(
@@ -2267,6 +2264,7 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
                         capture_output=True,
                         timeout=120,
                         text=True,
+                        cwd="/tmp",
                         check=False,
                     )