diff --git a/REQUIRE b/REQUIRE
index 8de2f87..02d2101 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -3,3 +3,4 @@ MathProgBase 0.6.0
 EAGOSmoothMcCormickGrad 0.0.1
 IntervalArithmetic 0.9.1
 IntervalContractors 0.1.0
+Clp 0.3.1