diff --git a/test/Project.toml b/test/Project.toml
index 70379bd8..98144b73 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -1,6 +1,5 @@
 [deps]
 Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
-GLPK = "60bf3e95-4087-53dc-ae20-288a0d20c6a6"
 GeometryBasics = "5c1252a2-5f33-56bf-86c9-59e7332b4326"
 HiGHS = "87dc4568-4c63-4d18-b0c0-bb2238e4078b"
 JuMP = "4076af6c-e467-56ae-b986-b466b2749572"
diff --git a/test/redundancy.jl b/test/redundancy.jl
index 4bd4efca..a4218d19 100644
--- a/test/redundancy.jl
+++ b/test/redundancy.jl
@@ -370,13 +370,13 @@ end
     @test npoints(P) > 0
 end
 
-import GLPK
+import HiGHS
 @testset "Noise linearity #259" begin
     h = HalfSpace([-1.3333333333333333, -2.220446049250313e-16], 0.0) ∩ HalfSpace([0.0, 1.333333333333333], 0.0) ∩ HalfSpace([-2.7755575615628914e-17, -0.6666666666666667], 0.0) ∩ HalfSpace([-0.33333333333333337, 0.0], 0.0)
     # Presolve off on purpose to test that `λ_l∞` fixes it.
-    hh = detecthlinearity(h, GLPK.Optimizer)
+    hh = detecthlinearity(h, HiGHS.Optimizer)
     @test nhyperplanes(hh) == 1
-    hhh = removehredundancy(hh, GLPK.Optimizer)
+    hhh = removehredundancy(hh, HiGHS.Optimizer)
     @test nhyperplanes(hhh) == 1
     @test nhalfspaces(hhh) == 1
 end