diff --git a/requirements.txt b/requirements.txt
index 54177bb8..e989a658 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,8 @@
-filterpy
-jupyter
-notebook
-sympy
-numpy
-scipy
-matplotlib
+# Chapter notebooks briefly tested on Python 3.11.9 and the versions below
+filterpy==1.4.5
+jupyter==1.1.1
+notebook==7.2.2
+sympy==1.13.2
+numpy==1.26.4
+scipy==1.14.1
+matplotlib==3.6.3