diff --git a/3/chi.cabal b/3/chi.cabal
index 18e7537..e249920 100644
--- a/3/chi.cabal
+++ b/3/chi.cabal
@@ -12,7 +12,7 @@ library
     hashable >= 1.4.7.0 && < 1.6,
     mtl >= 2.2.2 && < 2.4,
     pretty ^>= 1.1.3.6,
-    QuickCheck ^>= 2.16.0.0,
+    QuickCheck >= 2.16.0.0,
     transformers >= 0.5.6.2 && < 0.7,
     unordered-containers ^>= 0.2.20
   build-tool-depends:
@@ -28,8 +28,9 @@ library
     .
 
 executable interpreter
-    main-is: Assignment.hs
+    main-is: Main.hs
+    hs-source-dirs:
+        interpreter
     build-depends: base
                  , chi
                  , mtl
-                 , unordered-containers
diff --git a/3/flake.nix b/3/flake.nix
index b3da1db..8785da6 100644
--- a/3/flake.nix
+++ b/3/flake.nix
@@ -10,7 +10,7 @@
 
   outputs = { self, nixpkgs, flake-utils }:
     let
-      ghcVer = "ghc910";
+      ghcVer = "ghc912";
       makeHaskellOverlay = overlay: final: prev: {
         haskell = prev.haskell // {
           packages = prev.haskell.packages // {
@@ -53,9 +53,6 @@
               withHoogle = true;
               buildInputs =
                 (with pkgs; [
-                  gnumake
-                  jasmin
-                  jre_minimal
                 ]) ++
                 (with haskellPackages; [
                   haskell-language-server
diff --git a/3/Assignment.hs b/3/interpreter/Main.hs
similarity index 98%
rename from 3/Assignment.hs
rename to 3/interpreter/Main.hs
index b15d63f..74e27cb 100644
--- a/3/Assignment.hs
+++ b/3/interpreter/Main.hs
@@ -1,5 +1,5 @@
 {-# Language LambdaCase, Strict #-}
-module Assignment where
+module Main where
 
 import Chi
 import Data.Functor ( (<&>) )