diff --git a/environment.yml b/environment.yml
index fca55bf38b794bbd633e305121430b14050093dc..7a9f36ce19cb9fd7e3e97040827a0dae3d9c0faf 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,5 +6,5 @@ dependencies:
   - scipy       = 1.4.*
   - matplotlib  = 3.1.*
   - numpy
-  - nutopy      = 0.4.*
+  - nutopy      = 0.3.*
   - jupyterlab  = 3.0.*
diff --git a/start b/start
index b0264775b8767394d0a4aea4ae3b4e232b5377f9..c0d2ecc4e5ec888cb9532a03747decade2c09ca7 100644
--- a/start
+++ b/start
@@ -1,5 +1,7 @@
 #!/bin/bash
 git clone --single-branch -b master https://gitlab.irit.fr/toc/mathn7/etudiants/controle-optimal.git
-mv controle-optimal/*.ipynb .
+rm -fr tp
+mkdir tp
+mv controle-optimal/*.ipynb ./tp
 rm -rf controle-optimal
 exec "$@"