diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index db3620d..a0bcf27 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -25,6 +25,9 @@ jobs:
           python3 -m pip install --upgrade pip
           python3 -m pip install --upgrade setuptools
           python3 -m pip install -r requirements.txt
+      - name: Lint with Ruff
+        run: ruff --output-format=github .
+        continue-on-error: true
       - name: Run tests
         run: |
           cd app
diff --git a/app/app/api.py b/app/app/api.py
index c802db1..2f542a4 100644
--- a/app/app/api.py
+++ b/app/app/api.py
@@ -6,12 +6,10 @@
 __copyright__   = "Copyright 2018-2024"
 
 
+import io
 from flask import Blueprint, jsonify, request
-
 from skimage.io import imread
-import io
-
-from .model import *
+from .model import current_app, np, preprocess_image
 
 
 api = Blueprint('api', __name__)
@@ -35,7 +33,7 @@ def predict():
             # classify the input image generating a list of predictions
             model = current_app.config["model"]
             preds = model.predict(preprocessed_image)
-            
+
             # add generated predictions to result
             result["predictions"] = []
 
diff --git a/app/app/model.py b/app/app/model.py
index f6943b6..b5476ca 100644
--- a/app/app/model.py
+++ b/app/app/model.py
@@ -18,7 +18,7 @@ def init_model():
     Returns:
         model: Loaded Deep Learning model.
     """
-    
+
     model = load_model(current_app.config["MODEL_PATH"])
     model.make_predict_function()
     return model
diff --git a/app/server.py b/app/server.py
index b170ac4..8ce09ee 100644
--- a/app/server.py
+++ b/app/server.py
@@ -6,8 +6,6 @@
 __copyright__   = "Copyright 2018-2024"
 
 
-import os
-
 from app import create_app
 
 app = create_app()
diff --git a/app/tests/test_app.py b/app/tests/test_app.py
index de9926a..869df07 100644
--- a/app/tests/test_app.py
+++ b/app/tests/test_app.py
@@ -6,9 +6,7 @@
 __copyright__   = "Copyright 2018-2024"
 
 
-import pytest
 import json
-import sys
 
 def test_index(client):
     response = client.get("/")
@@ -42,8 +40,8 @@ def test_api(client):
         print(json_response["most_probable_label"])
         # predictions
         for dic in json_response["predictions"]:
-            print("label {0} probability: {1}".format(dic["label"],dic["probability"]))
-        
+            print(f"label {dic['label']} probability: {dic['probability']}")
+
         assert json_response["most_probable_label"] == "4"
     # failed
     else:
diff --git a/requirements.txt b/requirements.txt
index 3bee82a..f1b88dc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,6 @@ numpy==1.26.4
 Pillow==10.2.0
 pytest==8.0.1
 requests==2.31.0
+ruff==0.2.2
 scikit-image==0.22.0
 tensorflow==2.15.0