diff --git a/requirements.txt b/requirements.txt
index 4796b00..303b58e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 torch>=1.8
-gpytorch>=1.4
-botorch>=0.4.0
+gpytorch<=1.4
+botorch<=0.4.0
 matplotlib>=3.1.1
 pyDOE2>=1.3.0
 numpy>=1.19.2