diff --git a/Project.toml b/Project.toml
index 430cb36..8654740 100644
--- a/Project.toml
+++ b/Project.toml
@@ -22,8 +22,9 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 SparseDiffTools = "47a9eef4-7e08-11e9-0b38-333d64bd3804"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
-[sources]
-MeshCatMechanisms = {url = "https://github.com/ferrolho/MeshCatMechanisms.jl", rev = "hf/upstream-changes"}
+[sources.MeshCatMechanisms]
+rev = "hf/upstream-changes"
+url = "https://github.com/ferrolho/MeshCatMechanisms.jl"
 
 [compat]
 Colors = "0.12, 0.13"
@@ -31,7 +32,7 @@ ForwardDiff = "0.10"
 GeometryBasics = "0.4, 0.5"
 Ipopt = "1"
 MeshCat = "1"
-MeshCatMechanisms = "0.9.1"
+MeshCatMechanisms = "0.9.1, 0.9"
 NPZ = "0.4"
 Plots = "1"
 PrecompileTools = "1"