diff --git a/src/PiecewiseLinearOpt.jl b/src/PiecewiseLinearOpt.jl
index 6646c48..4327bec 100644
--- a/src/PiecewiseLinearOpt.jl
+++ b/src/PiecewiseLinearOpt.jl
@@ -6,10 +6,10 @@
 module PiecewiseLinearOpt
 
 using JuMP
-import MathOptInterface
-const MOI = MathOptInterface
-using LinearAlgebra
-using Random
+
+import LinearAlgebra
+import MathOptInterface as MOI
+import Random
 
 export PWLFunction, UnivariatePWLFunction, BivariatePWLFunction, piecewiselinear
 
diff --git a/src/jump.jl b/src/jump.jl
index cd79b05..431c978 100644
--- a/src/jump.jl
+++ b/src/jump.jl
@@ -220,8 +220,8 @@ function sos2_encoding_constraints!(m, λ, y, h, B)
     n = length(λ)-1
     for b in B
         JuMP.@constraints(m, begin
-            dot(b,h[1])*λ[1] + sum(min(dot(b,h[v]),dot(b,h[v-1]))*λ[v] for v in 2:n) + dot(b,h[n])*λ[n+1] ≤ dot(b,y)
-            dot(b,h[1])*λ[1] + sum(max(dot(b,h[v]),dot(b,h[v-1]))*λ[v] for v in 2:n) + dot(b,h[n])*λ[n+1] ≥ dot(b,y)
+            LinearAlgebra.dot(b,h[1])*λ[1] + sum(min(LinearAlgebra.dot(b,h[v]),LinearAlgebra.dot(b,h[v-1]))*λ[v] for v in 2:n) + LinearAlgebra.dot(b,h[n])*λ[n+1] ≤ LinearAlgebra.dot(b,y)
+            LinearAlgebra.dot(b,h[1])*λ[1] + sum(max(LinearAlgebra.dot(b,h[v]),LinearAlgebra.dot(b,h[v-1]))*λ[v] for v in 2:n) + LinearAlgebra.dot(b,h[n])*λ[n+1] ≥ LinearAlgebra.dot(b,y)
         end)
     end
     return nothing
@@ -365,9 +365,9 @@ function compute_hyperplanes(C::Vector{Vector{T}}) where T <: Number
         if indices == [n-1]
             break
         end
-        if rank(d[indices,:]) == length(indices) && length(indices) <= k-1
+        if LinearAlgebra.rank(d[indices,:]) == length(indices) && length(indices) <= k-1
             if length(indices) == k-1
-                nullsp = nullspace(d[indices,:])
+                nullsp = LinearAlgebra.nullspace(d[indices,:])
                 @assert size(nullsp,2) == 1
                 v = vec(nullsp)
                 push!(spanners, canonical!(v))
@@ -406,7 +406,7 @@ function compute_hyperplanes(C::Vector{Vector{T}}) where T <: Number
 end
 
 function canonical!(v::Vector{Float64})
-    normalize!(v)
+    LinearAlgebra.normalize!(v)
     for j in 1:length(v)
         if abs(v[j]) < 1e-8
             v[j] = 0
@@ -582,7 +582,7 @@ function piecewiselinear(m::JuMP.Model, x₁::VarOrAff, x₂::VarOrAff, pwl::Biv
                 A = [p¹[1] p¹[2] 1
                      p²[1] p²[2] 1
                      p³[1] p³[2] 1]
-                @assert rank(A) == 3
+                @assert LinearAlgebra.rank(A) == 3
                 b = [0, 0, 1]
                 q = A \ b
                 @assert isapprox(q[1]*p¹[1] + q[2]*p¹[2] + q[3], 0, atol=1e-4)
diff --git a/src/types.jl b/src/types.jl
index 5f86985..f516220 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -44,7 +44,7 @@ function BivariatePWLFunction(x, y, fz::Function; pattern=:BestFit, seed=hash((l
     m = length(x)
     n = length(y)
 
-    mt = MersenneTwister(seed)
+    mt = Random.MersenneTwister(seed)
     # run for each square on [x[i],x[i+1]] × [y[i],y[i+1]]
     for i in 1:length(x)-1, j in 1:length(y)-1
         SWt, NWt, NEt, SEt = LinearIndices((m,n))[i,j], LinearIndices((m,n))[i,j+1], LinearIndices((m,n))[i+1,j+1], LinearIndices((m,n))[i+1,j]
diff --git a/test/runtests.jl b/test/runtests.jl
index 8d2b81a..cbfe74d 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -3,22 +3,51 @@
 # Use of this source code is governed by an MIT-style license that can be found
 # in the LICENSE.md file or at https://opensource.org/licenses/MIT.
 
-using Cbc
+using PiecewiseLinearOpt
 using Test
-using LinearAlgebra
 
+import Cbc
 import JuMP
-import MathOptInterface
-const MOI = MathOptInterface
-
-using PiecewiseLinearOpt
-
-# TODO: Add :SOS2 to this list, once Cbc supports it
-methods_1D = (:CC,:MC,:Logarithmic,:LogarithmicIB,:ZigZag,:ZigZagInteger,:GeneralizedCelaya,:SymmetricCelaya,:Incremental,:DisaggLogarithmic)
-# TODO: Add :SOS2 to this list, once Cbc supports it
-# TODO: Add :MC to this list, Cbc (but not Gurobi) gives a different answer below, only for :MC (maybe a bug in Cbc?)
-methods_2D = (:CC,:Logarithmic,:LogarithmicIB,:ZigZag,:ZigZagInteger,:GeneralizedCelaya,:SymmetricCelaya,:DisaggLogarithmic)
-patterns_2D = (:Upper,:Lower,:BestFit,:UnionJack,:K1,:Random) # :OptimalTriangleSelection and :Stencil not supported currently
+import LinearAlgebra
+import MathOptInterface as MOI
+
+methods_1D = (
+    :CC,
+    :MC,
+    :Logarithmic,
+    :LogarithmicIB,
+    :ZigZag,
+    :ZigZagInteger,
+    :GeneralizedCelaya,
+    :SymmetricCelaya,
+    :Incremental,
+    :DisaggLogarithmic,
+    # :SOS2, not supported by Cbc
+)
+
+methods_2D = (
+    :CC,
+    :Logarithmic,
+    :LogarithmicIB,
+    :ZigZag,
+    :ZigZagInteger,
+    :GeneralizedCelaya,
+    :SymmetricCelaya,
+    :DisaggLogarithmic,
+    # :SOS2, not supported by Cbc
+    # TODO: Add :MC to this list, Cbc (but not Gurobi) gives a different answer
+    #       below, only for :MC (maybe a bug in Cbc?)
+)
+patterns_2D = (
+    :Upper,
+    :Lower,
+    :BestFit,
+    :UnionJack,
+    :K1,
+    :Random,
+    # :OptimalTriangleSelection not supported currently
+    # :Stencil
+)
 
 optimizer=JuMP.optimizer_with_attributes(Cbc.Optimizer, MOI.Silent() => true)
 
@@ -28,17 +57,12 @@ optimizer=JuMP.optimizer_with_attributes(Cbc.Optimizer, MOI.Silent() => true)
         JuMP.@variable(model, x)
         z = piecewiselinear(model, x, range(1,stop=2π, length=8), sin, method=method)
         JuMP.@objective(model, Max, z)
-
         JuMP.optimize!(model)
-
         @test JuMP.termination_status(model) == MOI.OPTIMAL
         @test JuMP.value(x) ≈ 1.75474 rtol=1e-4
         @test JuMP.value(z) ≈ 0.98313 rtol=1e-4
-
         JuMP.@constraint(model, x ≤ 1.5z)
-
         JuMP.optimize!(model)
-
         @test JuMP.termination_status(model) == MOI.OPTIMAL
         @test JuMP.value(x) ≈ 1.36495 rtol=1e-4
         @test JuMP.value(z) ≈ 0.90997 rtol=1e-4
@@ -55,20 +79,15 @@ end
         f = (x1,x2) -> 2*(x1-1/3)^2 + 3*(x2-4/7)^4
         z = piecewiselinear(model, x[1], x[2], BivariatePWLFunction(d, d, f, pattern=pattern), method=method)
         JuMP.@objective(model, Min, z)
-
         JuMP.optimize!(model)
-
         @test JuMP.termination_status(model) == MOI.OPTIMAL
         @test JuMP.value(x[1]) ≈ 0.285714 rtol=1e-4
         @test JuMP.value(x[2]) ≈ 0.571429 rtol=1e-4
         @test JuMP.value(z) ≈ 0.004535 rtol=1e-3
         @test JuMP.objective_value(model) ≈ 0.004535 rtol=1e-3
         @test JuMP.objective_value(model) ≈ JuMP.value(z) rtol=1e-3
-
         JuMP.@constraint(model, x[1] ≥ 0.6)
-
         JuMP.optimize!(model)
-
         @test JuMP.termination_status(model) == MOI.OPTIMAL
         @test JuMP.value(x[1]) ≈ 0.6 rtol=1e-4
         @test JuMP.value(x[2]) ≈ 0.571428 rtol=1e-4
@@ -77,7 +96,7 @@ end
         @test JuMP.objective_value(model) ≈ JuMP.value(z) rtol=1e-3
     end
 end
-#
+
 # println("\nbivariate optimal IB scheme tests")
 # @testset "2D: optimal IB, UnionJack" begin
 #     model = JuMP.Model(JuMP.with_optimizer(Cbc.Optimizer))
@@ -87,20 +106,15 @@ end
 #     f = (x,y) -> 2*(x-1/3)^2 + 3*(y-4/7)^4
 #     z = piecewiselinear(model, x, y, BivariatePWLFunction(d, d, f, pattern=:UnionJack), method=:OptimalIB, subsolver=solver)
 #     JuMP.@objective(model, Min, z)
-#
 #     JuMP.optimize!(model)
-#
 #     @test JuMP.termination_status(model) == MOI.OPTIMAL
 #     @test JuMP.value(x) ≈ 0.5 rtol=1e-4
 #     @test JuMP.value(y) ≈ 0.5 rtol=1e-4
 #     @test JuMP.value(z) ≈ 0.055634 rtol=1e-3
 #     @test getobjectivevalue(model) ≈ 0.055634 rtol=1e-3
 #     @test getobjectivevalue(model) ≈ JuMP.value(z) rtol=1e-3
-#
 #     JuMP.@constraint(model, x ≥ 0.6)
-#
 #     JuMP.optimize!(model)
-#
 #     @test JuMP.termination_status(model) == MOI.OPTIMAL
 #     @test JuMP.value(x) ≈ 0.6 rtol=1e-4
 #     @test JuMP.value(y) ≈ 0.5 rtol=1e-4