diff --git a/test/downstream/Project.toml b/test/downstream/Project.toml
index e6c4ae017c..7b6c99f687 100644
--- a/test/downstream/Project.toml
+++ b/test/downstream/Project.toml
@@ -2,6 +2,7 @@
 ControlSystemsMTK = "687d7614-c7e5-45fc-bfc3-9ee385575c88"
 DataInterpolations = "82cc6244-b520-54b8-b5a6-8a565e85f1d0"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+LinearSolve = "7ed4a6bd-45f5-4d41-b270-4a48e9bafcae"
 ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 ModelingToolkitStandardLibrary = "16a59e39-deab-5bd0-87e4-056b12336739"
 NonlinearSolve = "8913a72c-1f9b-4ce2-8d82-65094dcecaec"
@@ -17,6 +18,7 @@ SimpleDiffEq = "05bca326-078c-5bf0-a5bf-ce7c7982d7fd"
 SymbolicIndexingInterface = "2efcf032-c050-4f8e-a9bb-153293bab1f5"
 
 [compat]
+LinearSolve = "3.66"
 ModelingToolkitStandardLibrary = "2.19"
 SafeTestsets = "0.1, 1"
 SciMLTesting = "1"
diff --git a/test/qa/Project.toml b/test/qa/Project.toml
index b3001cc694..6a08fb4f85 100644
--- a/test/qa/Project.toml
+++ b/test/qa/Project.toml
@@ -4,6 +4,7 @@ JET = "c3a54625-cd67-489e-a8e7-0a5a0ff4e31b"
 ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 SciMLTesting = "09d9d899-5365-40a9-917a-5f67fddea283"
+TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [sources]
@@ -14,5 +15,6 @@ Aqua = "0.8"
 JET = "0.9,0.10,0.11"
 SafeTestsets = "0.1, 1"
 SciMLTesting = "1"
+TOML = "1"
 Test = "1"
 julia = "1.10"
diff --git a/test/qa/qa.jl b/test/qa/qa.jl
index fc7cf5a9aa..742b1fc00b 100644
--- a/test/qa/qa.jl
+++ b/test/qa/qa.jl
@@ -2,6 +2,16 @@ using ModelingToolkit
 using Aqua
 using JET
 using SciMLTesting
+using TOML
+using Test
+
+@testset "Downstream LinearSolve compatibility" begin
+    root_project = TOML.parsefile(joinpath(@__DIR__, "..", "..", "Project.toml"))
+    downstream_project = TOML.parsefile(joinpath(@__DIR__, "..", "downstream", "Project.toml"))
+
+    @test downstream_project["deps"]["LinearSolve"] == root_project["extras"]["LinearSolve"]
+    @test downstream_project["compat"]["LinearSolve"] == root_project["compat"]["LinearSolve"]
+end
 
 run_qa(
     ModelingToolkit;