diff --git a/requirements.txt b/requirements.txt
index 98a13836d1..a8b0c15190 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ jupyter
 pytest
 # nbconvert 7.3 has a bug that does not respect --output option
 # See https://github.com/jupyter/nbconvert/issues/1970
-nbconvert < 7.3 , >= 7.4
+nbconvert != 7.3.*
 
 # Needed by tutorials (run as part of roottest)
 pandas