diff --git a/requirements.txt b/requirements.txt
index ad89d2f419626f25a373a24f5de64d1649ec36a4..de6af900eb4bc2ec5fafbe3809d0d86193e89e23 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ toil[cwl]
 lsmtool
 pandas
 python-casacore
+pybind11
\ No newline at end of file