diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index 4bffe0379..9774d6b42 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -68,6 +68,8 @@ jobs:
           try
             # force it to use this PR's version of the package
             Pkg.develop(PackageSpec(path="."))  # resolver may fail with main deps
+            Pkg.add(PackageSpec(url="https://github.com/AayushSabharwal/RecursiveArrayTools.jl", rev="as/parameter-timeseries"))
+            Pkg.add(PackageSpec(url="https://github.com/SciML/SymbolicIndexingInterface.jl", rev="as/param-timeseries"))
             Pkg.update()
             Pkg.test(coverage=true)  # resolver may fail with test time deps
           catch err