diff --git a/Project.toml b/Project.toml
index a5f948b27..cfea1dcf4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -71,3 +71,4 @@ ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 EnzymeCore = "f151be2c-9106-41f4-ab19-57ee4f262869"
 MCMCChains = "c7f686f2-ff18-58e9-bc7b-31028e88f75d"
 ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
+ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"