diff --git a/runtimes/python3.nix b/runtimes/python3.nix
index 3831bca..a1c7152 100644
--- a/runtimes/python3.nix
+++ b/runtimes/python3.nix
@@ -1,9 +1,19 @@
 {pkgs, piston, ...}:
 let
-    pkg = pkgs.python3;
+    piston-python-packages = python-packages: with python-packages; [
+        numpy
+        scipy
+        pandas
+        pycrypto
+        whoosh
+        bcrypt
+        passlib
+        sympy
+    ];
+    pkg = pkgs.python3.withPackages piston-python-packages;
 in piston.mkRuntime {
     language = "python3";
-    version = pkg.version;
+    version = pkgs.python3.version;
 
     aliases = [
         "py3"