diff --git a/.github/workflows/packager.yml b/.github/workflows/packager.yml
index c3f51ac..eeb242d 100644
--- a/.github/workflows/packager.yml
+++ b/.github/workflows/packager.yml
@@ -37,6 +37,7 @@ jobs:
         run: |
           python -m pip install -U pip setuptools wheel
           python -m pip install -U -r requirements/packaging.txt
+          python -m pip install --no-deps -U -r requirements/embedded.txt -t roof_classify/embedded_external_libs
 
       - name: Update translations
         run: pylupdate5 -noobsolete -verbose ${{ env.PROJECT_FOLDER }}/resources/i18n/plugin_translation.pro
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index faba956..0e1f9d9 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -37,6 +37,7 @@ jobs:
       run: |
         python -m pip install -U pip setuptools wheel
         python -m pip install -U -r requirements/packaging.txt
+        python -m pip install --no-deps -U -r requirements/embedded.txt -t roof_classify/embedded_external_libs
 
     - name: Compile translations
       run: lrelease roof_classify/resources/i18n/*.ts
diff --git a/.github/workflows/tester.yml b/.github/workflows/tester.yml
index ea6e4b7..bc4e10d 100644
--- a/.github/workflows/tester.yml
+++ b/.github/workflows/tester.yml
@@ -42,6 +42,7 @@ jobs:
       - name: Install Python requirements
         run: |
           python3 -m pip install -U pip setuptools wheel
+          python -m pip install --no-deps -U -r requirements/embedded.txt -t roof_classify/embedded_external_libs
           python3 -m pip install -U -r requirements/testing.txt
 
       - name: Run Unit tests
diff --git a/.gitignore b/.gitignore
index 0f86389..6342e73 100644
--- a/.gitignore
+++ b/.gitignore
@@ -136,4 +136,5 @@ dmypy.json
 
 # *.qm
 *.zip
-.vscode/
+roof_classify/embedded_external_libs/
+
diff --git a/docs/development/environment.md b/docs/development/environment.md
index ae6eca8..bfe769e 100644
--- a/docs/development/environment.md
+++ b/docs/development/environment.md
@@ -16,9 +16,17 @@ In your virtual environment:
 
 ```bash
 # use the latest pip version
-python -m pip install -U pip setuptools wheel
+python -m pip install -U pip
 # install development tools
 python -m pip install -U -r requirements/development.txt
+# install external dependencies
+python -m pip install --no-deps -U -r requirements/embedded.txt -t roof_classify/embedded_external_libs
 # install pre-commit to respect common development guidelines
 pre-commit install
 ```
+
+## Additionnal external dependencies
+
+This plugin has external dependencies listed in this specific file: <requirements/embedded.txt>
+
+Because it's still hard to install Python 3rd party packages from an index (for example <https://pypi.org>), especially on Windows or Mac systems (or even on Linux if we want to do it properly in a virtual environment), those required packages are stored in the `embedded_external_libs` folder.
diff --git a/requirements/development.txt b/requirements/development.txt
index d0c10ea..aaf8e4a 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -1,5 +1,7 @@
-# Develoment dependencies
-# -----------------------
+# Development dependencies
+# ------------------------
+
+-r base.txt
 
 black
 flake8>=3.8,<3.10
diff --git a/requirements/embedded.txt b/requirements/embedded.txt
new file mode 100644
index 0000000..05a0c4a
--- /dev/null
+++ b/requirements/embedded.txt
@@ -0,0 +1,8 @@
+# Embedded requirements
+#
+# Typical command to install:
+# python -m pip install --no-deps -U -r requirements/embedded.txt -t roof_classify/embedded_external_libs
+# -----------------------
+
+joblib>=0.11
+scikit-learn==0.24.*
diff --git a/roof_classify/roof_classify.py b/roof_classify/roof_classify.py
index cce02bd..9440fb6 100644
--- a/roof_classify/roof_classify.py
+++ b/roof_classify/roof_classify.py
@@ -34,14 +34,23 @@
 #IMPORT PER CLASSIFICATORE
 import shapefile
 from osgeo import gdal
-from PyQt4.QtCore import QCoreApplication, QSettings, QTranslator, qVersion
-from PyQt4.QtGui import QAction, QFileDialog, QIcon
-
-# Import the code for the dialog
-from roof_classify_dialog import RoofClassifyDialog
-from sklearn import metrics
-from sklearn.ensemble import RandomForestClassifier
-from sklearn.svm import SVC
+from qgis.PyQt.QtCore import QCoreApplication, QSettings, QTranslator
+from qgis.PyQt.QtGui import QIcon
+from qgis.PyQt.QtWidgets import QAction, QFileDialog
+
+try:
+    from sklearn.ensemble import RandomForestClassifier
+    from sklearn.svm import SVC
+except Exception:
+    import site
+
+    from roof_classify.__about__ import DIR_PLUGIN_ROOT
+    site.addsitedir(DIR_PLUGIN_ROOT / "embedded_external_libs")
+    # from roof_classify.embedded_external_libs import joblib
+    from roof_classify.embedded_external_libs.sklearn.ensemble import (
+        RandomForestClassifier,
+    )
+    from roof_classify.embedded_external_libs.sklearn.svm import SVC
 
 from roof_classify.__about__ import DIR_PLUGIN_ROOT, __title__
 from roof_classify.toolbelt import PlgLogger