diff --git a/test/src/lmp/aelmp_test.jl b/test/src/lmp/aelmp_test.jl
index a7494bf..d619207 100644
--- a/test/src/lmp/aelmp_test.jl
+++ b/test/src/lmp/aelmp_test.jl
@@ -12,7 +12,10 @@ function lmp_aelmp_test()
         instance = UnitCommitment.read(path)
         model = UnitCommitment.build_model(
             instance = instance,
-            optimizer = Cbc.Optimizer,
+            optimizer = optimizer_with_attributes(
+                Cbc.Optimizer,
+                "logLevel" => 0,
+            ),
             variable_names = true,
         )
         JuMP.set_silent(model)
@@ -22,7 +25,10 @@ function lmp_aelmp_test()
         aelmp_1 = UnitCommitment.compute_lmp(
             model,
             AELMP(),
-            optimizer = HiGHS.Optimizer,
+            optimizer = optimizer_with_attributes(
+                HiGHS.Optimizer,
+                "log_to_console" => false,
+            ),
         )
         @test aelmp_1["s1", "B1", 1] ≈ 231.7 atol = 0.1
 
@@ -33,7 +39,10 @@ function lmp_aelmp_test()
                 allow_offline_participation = false,
                 consider_startup_costs = true,
             ),
-            optimizer = HiGHS.Optimizer,
+            optimizer = optimizer_with_attributes(
+                HiGHS.Optimizer,
+                "log_to_console" => false,
+            ),
         )
         @test aelmp_2["s1", "B1", 1] ≈ 274.3 atol = 0.1
     end
diff --git a/test/src/lmp/conventional_test.jl b/test/src/lmp/conventional_test.jl
index b1135c5..bd2529e 100644
--- a/test/src/lmp/conventional_test.jl
+++ b/test/src/lmp/conventional_test.jl
@@ -3,13 +3,12 @@
 # Released under the modified BSD license. See COPYING.md for more details.
 
 using UnitCommitment, Cbc, HiGHS, JuMP
-import UnitCommitment: ConventionalLMP
 
 function solve_conventional_testcase(path::String)
     instance = UnitCommitment.read(path)
     model = UnitCommitment.build_model(
         instance = instance,
-        optimizer = Cbc.Optimizer,
+        optimizer = optimizer_with_attributes(Cbc.Optimizer, "logLevel" => 0),
         variable_names = true,
     )
     JuMP.set_silent(model)
@@ -17,7 +16,10 @@ function solve_conventional_testcase(path::String)
     lmp = UnitCommitment.compute_lmp(
         model,
         ConventionalLMP(),
-        optimizer = HiGHS.Optimizer,
+        optimizer = optimizer_with_attributes(
+            HiGHS.Optimizer,
+            "log_to_console" => false,
+        ),
     )
     return lmp
 end