diff --git a/REQUIRE b/REQUIRE
index f84356e..82d202e 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -3,3 +3,4 @@ DiffEqBase 3.0.0
 NLsolve 0.14.0
 Compat 0.17.0
 Reexport
+DiffEqCallbacks