diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
index 7c2733d03..0ad6ddc90 100644
--- a/.github/workflows/Downstream.yml
+++ b/.github/workflows/Downstream.yml
@@ -78,6 +78,9 @@ jobs:
             @info "Not compatible with this release. No problem." exception=err
             exit(0)  # Exit immediately, as a success
           end
+        env:
+          RETESTITEMS_NWORKERS: 4
+          RETESTITEMS_NWORKER_THREADS: 2
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v3
         with:
diff --git a/src/SciMLBase.jl b/src/SciMLBase.jl
index f22bb2ebf..66365e8a9 100644
--- a/src/SciMLBase.jl
+++ b/src/SciMLBase.jl
@@ -102,7 +102,7 @@ $(TYPEDEF)
 
 Base for types which define nonlinear solve problems (f(u)=0).
 """
-abstract type AbstractNonlinearProblem{uType, isinplace} <: AbstractDEProblem end
+abstract type AbstractNonlinearProblem{uType, isinplace} <: AbstractSciMLProblem end
 abstract type AbstractIntervalNonlinearProblem{uType, isinplace} <:
               AbstractNonlinearProblem{uType,
     isinplace} end