diff --git a/Project.toml b/Project.toml
index b1d70194d3..10bf2e4ea9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -116,7 +116,7 @@ EnumX = "1.0.4"
 ExprTools = "0.1.10"
 FMI = "0.14"
 FindFirstFunctions = "1"
-ForwardDiff = "0.10.3"
+ForwardDiff = "0.10.3, 1"
 FunctionWrappers = "1.1"
 FunctionWrappersWrappers = "0.1"
 Graphs = "1.5.2"
@@ -156,7 +156,7 @@ Serialization = "1"
 Setfield = "0.7, 0.8, 1"
 SimpleNonlinearSolve = "0.1.0, 1, 2"
 SparseArrays = "1"
-SpecialFunctions = "0.7, 0.8, 0.9, 0.10, 1.0, 2"
+SpecialFunctions = "1, 2"
 StaticArrays = "0.10, 0.11, 0.12, 1.0"
 StochasticDelayDiffEq = "1.10"
 StochasticDiffEq = "6.72.1"
diff --git a/test/extensions/Project.toml b/test/extensions/Project.toml
index a5ab9a8d0c..4ebbd99d87 100644
--- a/test/extensions/Project.toml
+++ b/test/extensions/Project.toml
@@ -1,3 +1,6 @@
+[sources]
+ModelingToolkit = {path = "../.."}
+
 [deps]
 BifurcationKit = "0f109fa4-8a5d-4b75-95aa-f515264e7665"
 CasADi = "c49709b8-5c63-11e9-2fb2-69db5844192f"