diff --git a/deep_learning4e.py b/deep_learning4e.py
index 9f5b0a8f7..bb29306da 100644
--- a/deep_learning4e.py
+++ b/deep_learning4e.py
@@ -4,7 +4,8 @@
 import statistics
 
 import numpy as np
-from keras import Sequential, optimizers
+from tensorflow import keras
+from tensorflow.keras import Sequential, optimizers
 from keras.layers import Embedding, SimpleRNN, Dense
 from keras.preprocessing import sequence
 
diff --git a/perception4e.py b/perception4e.py
index edd556607..bc39c0ece 100644
--- a/perception4e.py
+++ b/perception4e.py
@@ -1,7 +1,7 @@
 """Perception (Chapter 24)"""
 
 import cv2
-import keras
+from tensorflow import keras
 import matplotlib.pyplot as plt
 import numpy as np
 import scipy.signal
diff --git a/requirements.txt b/requirements.txt
index dd6b1be8a..87d90dec1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,4 +15,4 @@ pytest-cov
 qpsolvers
 scipy
 sortedcontainers
-tensorflow
\ No newline at end of file
+tensorflow>=2.6.0
diff --git a/tests/test_deep_learning4e.py b/tests/test_deep_learning4e.py
index 34676b02b..9264c39f0 100644
--- a/tests/test_deep_learning4e.py
+++ b/tests/test_deep_learning4e.py
@@ -1,4 +1,5 @@
 import pytest
+from tensorflow import keras
 from keras.datasets import imdb
 
 from deep_learning4e import *