diff --git a/requirements.txt b/requirements.txt
index f253417d..374f8d2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ pyparsing==2.4.7
 semantic-version==2.8.5
 semver==2.13.0
 isort==5.10.1
+intbitset==3.0.1