diff --git a/docs/Project.toml b/docs/Project.toml
index 8dc25a3b1..b3d98a01a 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -10,6 +10,7 @@ LogDensityProblems = "6fdf6af0-433a-55f7-b3ed-c6c6e0b8df7c"
 Optimisers = "3bd65402-5787-11e9-1adc-39752487f4e2"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 QuasiMonteCarlo = "8a4e6c94-4038-4cdc-81c3-7e6ffdb2a71b"
+ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SimpleUnPack = "ce78b400-467f-4804-87d8-8f486da07d0a"
 StatsFuns = "4c63d2b9-4356-54db-8cca-17b64c39e42c"
 
@@ -25,6 +26,7 @@ LogDensityProblems = "2.1.1"
 Optimisers = "0.3"
 Plots = "1"
 QuasiMonteCarlo = "0.3"
+ReverseDiff = "1"
 SimpleUnPack = "1"
 StatsFuns = "1"
 julia = "1.6"