diff --git a/chapter1/install.md b/chapter1/install.md
index d846439..b1bccf3 100644
--- a/chapter1/install.md
+++ b/chapter1/install.md
@@ -6,23 +6,17 @@ It is recommanded to use a virtual environement.
 
 ```shell
 # create a virtual environement
-python3 -m venv .iga-python
+python3 -m venv iga-python-env
 
 # activate this environement using 
-source .iga-python/bin/activate
+source iga-python-env/bin/activate
 ```
 
 Then install dependencies using
 
 ```shell
-pip3 install wheel
-pip3 install numpy
-pip3 install pyccel 
-pip3 install ipykernel
-pip3 install git+https://github.com/pyccel/sympde.git
-pip3 install git+https://github.com/pyccel/gelato.git
-pip3 install git+https://github.com/pyccel/psydac.git
-pip3 install git+https://github.com/girving/igakit.git
+pip3 install 'psydac[extra] @ git+https://github.com/pyccel/psydac.git@devel#egg=psydac'
+pip3 install notebook
 ```
 
 Adding the virtual environement to Jupyter notebook, can be done using
diff --git a/requirements.txt b/requirements.txt
index 1841b8a..5a40e83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,4 @@ sphinx-proof
 matplotlib
 pyccel 
 ipykernel
-git+https://github.com/pyccel/psydac.git
+psydac[extra] @ git+https://github.com/pyccel/psydac.git@devel#egg=psydac
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