diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 1cd9edc1..8fc1a1e5 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -35,6 +35,7 @@ jobs:
         run: sudo apt --yes install apparmor-utils libsasl2-dev python3-dev libldap2-dev libssl-dev slapd ldap-utils
       - name: App armor configuration for slapd
         run: sudo aa-complain /usr/sbin/slapd
+      - run: poetry --version
       - run: poetry install
       - run: poetry run pytest
   minversions:
@@ -56,6 +57,7 @@ jobs:
         run: sudo aa-complain /usr/sbin/slapd
       - name: Force minimum dependency versions
         run: sed -i -E 's/"(\^|>=)([0-9])/"==\2/' pyproject.toml
+      - run: poetry --version
       - run: poetry install
       - run: poetry run pytest
   style:
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4956d485..ae2f2eef 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -50,6 +50,14 @@ python311:
     - poetry install
     - poetry run pytest
 
+minversions:
+  image: python:3.8
+  stage: test
+  script:
+    - sed -i -E 's/"(\^|>=)([0-9])/"==\2/' pyproject.toml
+    - poetry install
+    - poetry run pytest
+
 doc:
   image: python:3.11
   stage: test
diff --git a/poetry.lock b/poetry.lock
index ea9e5cea..ad1e4f11 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1938,5 +1938,5 @@ sentry = ["sentry-sdk"]
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.8, <4"
-content-hash = "013f52b11b33e916ff159b7dfb8a88bd6a3897bf23c0ac5ee6ecd8156dcf6f68"
+python-versions = "^3.8"
+content-hash = "2afc1e78435e1b3164c02286897e7d2f56a63dc17f3b820e5904cd86659cafec"
diff --git a/pyproject.toml b/pyproject.toml
index 4f5b9e7b..e160fac3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,20 +35,20 @@ readme = "README.md"
 include = ["canaille/translations/*/LC_MESSAGES/*.mo"]
 
 [tool.poetry.dependencies]
-python = ">=3.8, <4"
+python = "^3.8"
 authlib = "^1.2.1"
-click = "<9"
-email_validator = "<3"
-flask = "<2.3"
+click = ">=7.0.0"
+email_validator = "^2.0.0"
+flask = ">=2.0 <2.3"
 flask-babel = "^3.0.0"
 flask-themer = "^2.0.0"
-flask-wtf = "<2"
-pycountry = "^22.3.5"
-python-ldap = "<4"
-pytz = "^2023.3"
-toml = "<1"
-wtforms = "<4"
-werkzeug = "<2.3"
+flask-wtf = "^1.1.1"
+pycountry = "^22.0.0"
+python-ldap = "^3.4.0"
+pytz = ">=2023.3"
+toml = "^0.10.0"
+wtforms = "^3.0.1"
+werkzeug = ">=2.0 <2.3"
 
 "sentry-sdk" = {version = "<2", optional=true, extras=["flask"]}
 
@@ -59,7 +59,7 @@ optional = true
 "sphinx" = "*"
 "sphinx-rtd-theme" = "*"
 "sphinx-issues" = "*"
-pygments-ldif = "^1.0.1"
+pygments-ldif = "==1.0.1"
 
 [tool.poetry.group.dev.dependencies]
 coverage = {version = "*", extras=["toml"]}
@@ -71,10 +71,10 @@ pre-commit = "*"
 pyquery = "*"
 pytest = "*"
 pytest-coverage = "*"
-pytest-flask = "^1.2.0"
+pytest-flask = "==1.2.0"
 pytest-httpserver = "*"
-pytest-lazy-fixture = "^0.6.3"
-pytest-xdist = "^3.3.1"
+pytest-lazy-fixture = "==0.6.3"
+pytest-xdist = "==3.3.1"
 slapd = "*"
 smtpdfix = "*"