diff --git a/requirements.txt b/requirements.txt
index 897687e..d20e752 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,6 @@ matplotlib >= 3.7.1   # ch04, ch05
 numpy >= 1.24.3       # ch05
 tensorflow >= 2.15.0  # ch05
 tqdm >= 4.66.1        # ch05, ch07
+numpy < 2.0           # dependency of several other libraries like torch and pandas
 pandas >= 2.2.1       # ch06
 psutil >= 5.9.5       # ch07, already installed automatically as dependency of torch