diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
new file mode 100644
index 0000000..811ee4b
--- /dev/null
+++ b/.github/workflows/python-package.yml
@@ -0,0 +1,41 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python package
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install flake8 pytest
+        pip install -r requirements-all.txt
+        pip install .
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest
diff --git a/src/tomtom_api/priority_queue/lib.py b/src/tomtom_api/priority_queue/lib.py
index 6d49dd9..de6416c 100644
--- a/src/tomtom_api/priority_queue/lib.py
+++ b/src/tomtom_api/priority_queue/lib.py
@@ -150,8 +150,7 @@ def priority_queue_update_job(
 
     item: QueueItem = db.get_filtered_items(uid=uid)[0]
     item.update(name, priority, cancel, payload)
-    db.update([item])
-    db.write()
+    db.update([item], force_write=True)
 
 
 def pretty_print_queue(queue: List[QueueItem]) -> str:
diff --git a/src/tomtom_api/priority_queue/models/database.py b/src/tomtom_api/priority_queue/models/database.py
index 0172559..5be107d 100644
--- a/src/tomtom_api/priority_queue/models/database.py
+++ b/src/tomtom_api/priority_queue/models/database.py
@@ -40,6 +40,15 @@ def __init__(self):
         self.df = None
         self.read()
 
+    def _force_col_types(self) -> None:
+        for time_col in ['created_timestamp',
+                         'updated_timestamp',
+                         'submitted_timestamp',
+                         'completed_timestamp',
+                         'cancelled_timestamp',
+                         'error_timestamp']:
+            self.df[time_col] = pd.to_datetime(self.df[time_col])
+
     def read(self) -> None:
         """Read the file and store the content in the dataframe attribute.
         """
@@ -47,6 +56,7 @@ def read(self) -> None:
             self.df = pd.DataFrame(columns=self.columns)
         else:
             self.df = pd.read_parquet(self.file)
+        self._force_col_types()
 
     def write(self) -> None:
         """Write the content of the dataframe into the file.
@@ -74,6 +84,7 @@ def add(self, item: QueueItem) -> None:
         data = {k: item.__dict__[k] for k in self.columns}
         data['report_type'] = item.payload.__class__.__name__
         self.df = pd.concat([self.df, pd.DataFrame([data])])
+        self._force_col_types()
 
     def get_next(self, n: int = 1) -> List[QueueItem]:
         """Get the list of the next element(s)
@@ -225,3 +236,4 @@ def empty(self) -> None:
         """Empty the database
         """
         self.df = pd.DataFrame(columns=self.columns)
+        self._force_col_types()