diff --git a/repo2docker/buildpacks/base.py b/repo2docker/buildpacks/base.py
index 3e1e440b..41fea076 100644
--- a/repo2docker/buildpacks/base.py
+++ b/repo2docker/buildpacks/base.py
@@ -170,6 +170,8 @@ class BuildPack:
             # FIXME: Use npm from nodesource!
             # Everything seems to depend on npm these days, unfortunately.
             "npm",
+            
+            "unzip",
         }
 
     def get_env(self):