diff --git a/Project.toml b/Project.toml
index ed3995e..06b918d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,13 +12,13 @@ ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a"
 
 [compat]
-ColorSchemes = "3.0 - 3.20"
+ColorSchemes = "3.0 - 3.24"
 ColorTypes = "0.7 - 0.11.4"
-DifferentialEquations = "7.1 - 7.7"
+DifferentialEquations = "7.1 - 7.12"
 IfElse = "0.1.1"
-ModelingToolkit = "8.26 - 8.48.1"
-PlotlyJS = "0.13 - 0.18.10"
-julia = "1.6 - 1.9"
+ModelingToolkit = "8.26 - 8.75"
+PlotlyJS = "0.13 - 0.18.12"
+julia = "1.6 - 1.10"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
diff --git a/src/WorldDynamics.jl b/src/WorldDynamics.jl
index 77d50ba..4d42802 100644
--- a/src/WorldDynamics.jl
+++ b/src/WorldDynamics.jl
@@ -10,10 +10,10 @@ export interpolate, clip, switch
 
 using ModelingToolkit
 
-@register interpolate(x, y::Tuple{Vararg{Float64}}, xs::Tuple{Float64, Float64})
-@register clip(f1, f2, va, th)
-@register switch(v1, v2, z)
-@register WorldDynamics.step(t, hght, sttm)
+@register_symbolic interpolate(x, y::Tuple{Vararg{Float64}}, xs::Tuple{Float64, Float64})
+@register_symbolic clip(f1, f2, va, th)
+@register_symbolic switch(v1, v2, z)
+@register_symbolic WorldDynamics.step(t, hght, sttm)
 
 export World1
 export World1A