diff --git a/_gtfobins/npm.md b/_gtfobins/npm.md
index 7bc88ae..291afa8 100644
--- a/_gtfobins/npm.md
+++ b/_gtfobins/npm.md
@@ -1,6 +1,7 @@
 ---
 functions:
   shell:
+    - code: npm exec /bin/sh
     - code: |
         TF=$(mktemp -d)
         echo '{"scripts": {"preinstall": "/bin/sh"}}' > $TF/package.json
diff --git a/_gtfobins/yarn.md b/_gtfobins/yarn.md
index a9295fe..072dc2e 100644
--- a/_gtfobins/yarn.md
+++ b/_gtfobins/yarn.md
@@ -2,6 +2,10 @@
 functions:
   shell:
     - code: yarn exec /bin/sh
+    - code: |
+        TF=$(mktemp -d)
+        echo '{"scripts": {"preinstall": "/bin/sh"}}' > $TF/package.json
+        yarn --cwd $TF install
   sudo:
     - code: sudo yarn exec /bin/sh
 ---