diff --git a/REQUIRE b/REQUIRE
index 27c07830..17d4c290 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -7,3 +7,4 @@ Calculus 0.4.1
 Optim 0.16.0
 PenaltyFunctions 0.1.0
 Distributions 0.16.0
+BlackBoxOptim