diff --git a/DEV.md b/DEV.md
index 3478c7c..1bbc005 100644
--- a/DEV.md
+++ b/DEV.md
@@ -9,6 +9,9 @@
 
 ## Testing
 
+    # prerequisites
+    pip install -r requirements-tests.txt
+
     # basic
     PYTHONPATH=. pytest
 
diff --git a/README.md b/README.md
index c83e398..cb6265c 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ virtualenv
 ### Python venv
 
 ``` bash
-virtualenv venv
+python3 -m venv venv
 source venv/bin/activate
 pip install matplotlib
 pip install numpy==1.8.*
diff --git a/requirements-tests.txt b/requirements-tests.txt
index 4e9ad68..dcdd991 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -1 +1,3 @@
-selenium flask_testing
+selenium
+flask_testing
+pytest
diff --git a/requirements.txt b/requirements.txt
index 9b48e48..372642b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,52 +7,13 @@
 
 
 ## MAIN DEPENDENCIES
-
-Flask==0.12
-Jinja2==2.9.5
-Markdown==2.6.8
-MarkupSafe==1.0
-python-slugify==1.2.4
-requests==2.19.1
-
-# Why not pyvo ?
-# For obscure reasons within spacepy, only numpy 1.7 or 1.8 will work
-# and pyvo requires astropy, that requires a more recent numpy.
-#pyvo==0.9.*
-
-
-## FILE FORMATS
-
-# Also available : https://pypi.org/project/pupynere/
-
-PyYAML==3.12
-netCDF4==1.2.7
-h5py==2.8.0
-# spacepy does not like recent numpy versions (1.7 looks ok -- 1.8 works too)
-numpy==1.8.*
-# We only use pycdf from spacepy.
-# Ulterior versions are broken on install. (for python 2.7)
-spacepy==0.1.5
-
-# isoparse needs at least 2.7
-python-dateutil==2.7.*
-
-## SECOND LEVEL DEPS
-# (comment them out if you have compatibility issues)
-
-appdirs==1.4.3
-click==6.7
-dateutils==0.6.6
-itsdangerous==0.24
-mglob==0.4
-pyparsing==2.2.0
-packaging==16.8
-six==1.10.0
-Werkzeug==0.12
-Cython==0.27.1
-
-
-## WEIRD STUFF
-
-# This version number makes pip yell on the prod server (?)
-#pkg-resources==0.0.0
+wheel
+Flask==2.1.2
+python-dotenv==0.20.0
+requests==2.27.1
+numpy==1.22.4
+python-dateutil==2.8.2
+Yaml8==0.1.2
+netCDF4==1.5.8
+unicode-slugify==0.1.5
+gunicorn==20.1.0
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