diff --git a/requirements.txt b/requirements.txt
index 1f116b0..f591d4d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,16 +1,17 @@
-numpy==1.24.2
-scipy==1.11.1
-pandas==1.5.3
-lxml==4.9.3
-scikit-learn==1.3.0
-joblib==1.3.1
-statsmodels==0.14.0
-lifelines==0.27.7
-pygam==0.9.0
-l0bnb==1.0.0
-torch==2.0.1
-torchvision==0.15.2
-pytorch-lightning==2.0.6
-torchinfo==1.8.0
-torchmetrics==1.0.1
-ISLP==0.3.18
+numpy>=1.7.1
+scipy>=0.9
+pandas>=0.20
+pandas<=1.9
+lxml # pandas needs this for html
+scikit-learn>=1.2
+joblib
+statsmodels>=0.13
+lifelines
+pygam # for GAM in Ch7
+l0bnb==1.0.0 # for bestsubsets
+ISLP
+torch
+pytorch_lightning
+torchmetrics
+torchvision
+torchinfo