diff --git a/flake.lock b/flake.lock
index 84bc2a5..139afc4 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,17 +2,17 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1655624069,
-        "narHash": "sha256-7g1zwTdp35GMTERnSzZMWJ7PG3QdDE8VOX3WsnOkAtM=",
+        "lastModified": 1713145326,
+        "narHash": "sha256-m7+IWM6mkWOg22EC5kRUFCycXsXLSU7hWmHdmBfmC3s=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0d68d7c857fe301d49cdcd56130e0beea4ecd5aa",
+        "rev": "53a2c32bc66f5ae41a28d7a9a49d321172af621e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0d68d7c857fe301d49cdcd56130e0beea4ecd5aa",
+        "rev": "53a2c32bc66f5ae41a28d7a9a49d321172af621e",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 51509eb..b8802f6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,8 +2,7 @@
   description = "Flake for haga";
   inputs = {
     nixpkgs.url =
-      # 2022-06-22
-      "github:NixOS/nixpkgs/0d68d7c857fe301d49cdcd56130e0beea4ecd5aa";
+      "github:NixOS/nixpkgs/53a2c32bc66f5ae41a28d7a9a49d321172af621e";
 
   };
 
@@ -14,10 +13,12 @@
       # defaultPackage.${system} = haskellPackages.callPackage ./default.nix { };
       devShell.${system} = mkShell {
         buildInputs = [
+          haskell.compiler.ghc981
+          git
+          gcc
+          gmp
           feedgnuplot
-          haskellPackages.cabal-install
-          haskellPackages.ormolu
-          haskell.compiler.ghc8107
+          stack
         ];
       };
     };
diff --git a/haga.cabal b/haga.cabal
index f9fd041..6076d99 100644
--- a/haga.cabal
+++ b/haga.cabal
@@ -49,8 +49,8 @@ library
                      , Pretty
                      , Szenario191
                      , LambdaCalculus
-                     , GermanDataset
-                     , GermanData
+                     , NurseryDataset
+                     , NurseryData
                      , Utils
 executable haga
   build-depends:       base
@@ -83,8 +83,8 @@ executable haga
                      , Pretty
                      , Szenario191
                      , LambdaCalculus
-                     , GermanDataset
-                     , GermanData
+                     , NurseryDataset
+                     , NurseryData
                      , Utils
 
 executable haga-test
@@ -119,6 +119,6 @@ executable haga-test
                      , Pretty
                      , Szenario191
                      , LambdaCalculus
-                     , GermanDataset
-                     , GermanData
+                     , NurseryDataset
+                     , NurseryData
                      , Utils
diff --git a/src/Main.hs b/src/Main.hs
index 11ecf94..b97baa4 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -9,7 +9,7 @@ import Protolude hiding (for)
 import System.IO
 -- import Szenario212Pun
 -- import Szenario191
-import GermanDataset
+import NurseryDataset
 import Debug.Trace as DB
 import qualified Data.Map.Strict as Map
 
@@ -51,19 +51,19 @@ main :: IO ()
 main =
   execParser optionsWithHelp >>= \opts -> do
     hSetBuffering stdout NoBuffering
-    germanLEE <- shuffledGermanLEE
-    let env = germanLE
+    nurseryLEE <- shuffledNurseryLEE
+    let env = nurseryLE
     let selType = Tournament 3
-    let run' = run germanLEE env selType 80 (5 / 100) (populationSize opts) (steps (iterations opts))
+    let run' = run nurseryLEE env selType 80 (5 / 100) (populationSize opts) (steps (iterations opts))
     pop' <- runEffect (for run' logCsv)
-    germanLEE' <- calc germanLEE  pop'
-    let (res, _) = bests germanLEE' 5 pop'
-    let germanLEE' = germanLEE {training = False}
-    germanLEE' <- calc germanLEE' res
-    mapM_ (format germanLEE') res
+    nurseryLEE' <- calc nurseryLEE  pop'
+    let (res, _) = bests nurseryLEE' 5 pop'
+    let nurseryLEE' = nurseryLEE {training = False}
+    nurseryLEE' <- calc nurseryLEE' res
+    mapM_ (format nurseryLEE') res
   where
-    format germanL s = do
-      let f = fitness' germanL s
+    format nurseryL s = do
+      let f = fitness' nurseryL s
       putErrText $ show f <> "\n" <> pretty s
     logCsv = putText . csv
     csv (t, f) = show t <> " " <> show f