diff --git a/demo/Dockerfile-canaille b/demo/Dockerfile-canaille
index 05d419aa..1697679e 100644
--- a/demo/Dockerfile-canaille
+++ b/demo/Dockerfile-canaille
@@ -9,8 +9,9 @@ RUN \
     libldap2-dev \
     libssl-dev
 
-COPY setup.cfg setup.py /opt/canaille/
-RUN pip install --editable /opt/canaille
-
+COPY poetry.lock pyproject.toml /opt/canaille/
+RUN pip install poetry
 WORKDIR /opt/canaille
-ENTRYPOINT ["flask", "run", "--host=0.0.0.0"]
+RUN poetry install
+
+ENTRYPOINT ["poetry", "run", "flask", "run", "--host=0.0.0.0"]
diff --git a/demo/Dockerfile-client b/demo/Dockerfile-client
index d340d649..e51917d8 100644
--- a/demo/Dockerfile-client
+++ b/demo/Dockerfile-client
@@ -5,8 +5,8 @@ RUN \
     apt -y upgrade
 
 RUN pip install \
-    flask \
-    "authlib<1.0.0" \
+    "flask<3" \
+    "authlib<2" \
     requests
 
 WORKDIR /opt/client
diff --git a/demo/Procfile b/demo/Procfile
index 3d382797..5f7ff816 100644
--- a/demo/Procfile
+++ b/demo/Procfile
@@ -1,4 +1,4 @@
 slapd: ./slapd.sh
-canaille: env AUTHLIB_INSECURE_TRANSPORT=1 FLASK_ENV=development CONFIG=conf/canaille.toml FLASK_APP=../../canaille env/bin/flask run --extra-files conf/canaille.toml
-client1: env FLASK_ENV=development CONFIG=../conf/client1.cfg FLASK_APP=client env/bin/flask run --port=5001
-client2: env FLASK_ENV=development CONFIG=../conf/client2.cfg FLASK_APP=client env/bin/flask run --port=5002
+canaille: env AUTHLIB_INSECURE_TRANSPORT=1 FLASK_ENV=development CONFIG=conf/canaille.toml FLASK_APP=../../canaille flask run --extra-files conf/canaille.toml
+client1: env FLASK_ENV=development CONFIG=../conf/client1.cfg FLASK_APP=client flask run --port=5001
+client2: env FLASK_ENV=development CONFIG=../conf/client2.cfg FLASK_APP=client flask run --port=5002
diff --git a/demo/run.sh b/demo/run.sh
index ee849ae4..f4dded77 100755
--- a/demo/run.sh
+++ b/demo/run.sh
@@ -17,22 +17,23 @@ function run {
         return 1
     fi
 
-    if ! test -d "$DIR/env"; then
-        {
-            virtualenv "$DIR/env" &&
-            "$DIR/env/bin/pip" install --editable "$DIR/.." &&
-            "$DIR/env/bin/pip" install honcho requests slapd
-        } || rm --recursive --force "$DIR/env"
+    if ! type poetry > /dev/null 2>&1; then
+        echo "Cannot start the LDAP server. Please install python on your system."
+        echo "https://python-poetry.org/docs/#installation"
+        return 1
     fi
 
+    poetry install
+    poetry run pip install honcho requests slapd
+
     if [ "$1" == "--ldap-native" ]; then
-        env "SLAPD_BINARY=NATIVE" "PWD=$DIR" "$DIR/env/bin/honcho" start
+        env "SLAPD_BINARY=NATIVE" "PWD=$DIR" poetry run honcho start
 
     elif [ "$1" == "--ldap-docker" ]; then
-        env "SLAPD_BINARY=DOCKER" "PWD=$DIR" "$DIR/env/bin/honcho" start
+        env "SLAPD_BINARY=DOCKER" "PWD=$DIR" poetry run honcho start
 
     else
-        env "PWD=$DIR" "$DIR/env/bin/honcho" start
+        env "PWD=$DIR" poetry run honcho start
     fi
 }
 
diff --git a/demo/slapd.sh b/demo/slapd.sh
index b9cfeccf..ee65fd4f 100755
--- a/demo/slapd.sh
+++ b/demo/slapd.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 if [ "$SLAPD_BINARY" == "NATIVE" ] || ([ "$SLAPD_BINARY" == "" ] && type slapd > /dev/null 2>&1); then
-    env BIN=$BIN:/usr/bin:/usr/sbin env/bin/python ldap-server.py
+    env BIN=$BIN:/usr/bin:/usr/sbin python ldap-server.py
 
 elif [ "$SLAPD_BINARY" == "DOCKER" ] || ([ "$SLAPD_BINARY" == "" ] && type docker-compose > /dev/null 2>&1); then
     docker-compose run --service-ports --rm ldap