diff --git a/lib/SurrogatesRandomForest/Project.toml b/lib/SurrogatesRandomForest/Project.toml
index b48b04fc4..b9cc6d9a4 100644
--- a/lib/SurrogatesRandomForest/Project.toml
+++ b/lib/SurrogatesRandomForest/Project.toml
@@ -5,16 +5,21 @@ version = "0.1.1"
 
 [deps]
 Surrogates = "6fc51010-71bc-11e9-0e15-a3fcc6593c49"
+SurrogatesBase = "89f642e6-4179-4274-8202-c11f4bd9a72c"
 XGBoost = "009559a3-9522-5dbb-924b-0b6ed2b22bb9"
 
 [compat]
-Surrogates = "6"
+SafeTestsets = "0.1"
+Surrogates = "6.9"
+SurrogatesBase = "1.1"
+Test = "1"
 XGBoost = "2"
 julia = "1.10"
 
 [extras]
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
+Surrogates = "6fc51010-71bc-11e9-0e15-a3fcc6593c49"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["SafeTestsets", "Test"]
+test = ["SafeTestsets", "Surrogates", "Test"]
diff --git a/lib/SurrogatesRandomForest/src/SurrogatesRandomForest.jl b/lib/SurrogatesRandomForest/src/SurrogatesRandomForest.jl
index 498688748..d7418cde5 100644
--- a/lib/SurrogatesRandomForest/src/SurrogatesRandomForest.jl
+++ b/lib/SurrogatesRandomForest/src/SurrogatesRandomForest.jl
@@ -1,10 +1,12 @@
 module SurrogatesRandomForest
 
-import Surrogates: add_point!, AbstractSurrogate, _check_dimension
-export RandomForestSurrogate
+using SurrogatesBase
+using XGBoost: xgboost, predict
 
-using XGBoost
-mutable struct RandomForestSurrogate{X, Y, B, L, U, N} <: AbstractSurrogate
+export RandomForestSurrogate, update!
+
+mutable struct RandomForestSurrogate{X, Y, B, L, U, N} <:
+               SurrogatesBase.AbstractDeterministicSurrogate
     x::X
     y::Y
     bst::B
@@ -13,69 +15,56 @@ mutable struct RandomForestSurrogate{X, Y, B, L, U, N} <: AbstractSurrogate
     num_round::N
 end
 
-function RandomForestSurrogate(x, y, lb::Number, ub::Number; num_round::Int = 1)
-    bst = xgboost((reshape(x, length(x), 1), y); num_round)
-    RandomForestSurrogate(x, y, bst, lb, ub, num_round)
-end
-
-function (rndfor::RandomForestSurrogate)(val::Number)
-    # Check to make sure dimensions of input matches expected dimension of surrogate
-    _check_dimension(rndfor, val)
-    return XGBoost.predict(rndfor.bst, reshape([val], 1, 1))[1]
-end
-
 """
-RandomForestSurrogate(x,y,lb,ub,num_round)
+    RandomForestSurrogate(x, y, lb, ub, num_round)
 
 Build Random forest surrogate. num_round is the number of trees.
+
+## Arguments
+
+  - `x`: Input data points.
+  - `y`: Output data points.
+  - `lb`: Lower bound of input data points.
+  - `ub`: Upper bound of output data points.
+
+## Keyword Arguments
+
+  - `num_round`: number of rounds of training.
 """
 function RandomForestSurrogate(x, y, lb, ub; num_round::Int = 1)
     X = Array{Float64, 2}(undef, length(x), length(x[1]))
-    for j in 1:length(x)
-        X[j, :] = vec(collect(x[j]))
+    if length(lb) == 1
+        for j in eachindex(x)
+            X[j, 1] = x[j]
+        end
+    else
+        for j in eachindex(x)
+            X[j, :] = x[j]
+        end
     end
     bst = xgboost((X, y); num_round)
     RandomForestSurrogate(x, y, bst, lb, ub, num_round)
 end
 
+function (rndfor::RandomForestSurrogate)(val::Number)
+    return rndfor([val])
+end
+
 function (rndfor::RandomForestSurrogate)(val)
-    # Check to make sure dimensions of input matches expected dimension of surrogate
-    _check_dimension(rndfor, val)
-    return XGBoost.predict(rndfor.bst, reshape(collect(val), 1, length(val)))[1]
+    return predict(rndfor.bst, reshape(val, length(val), 1))[1]
 end
 
-function add_point!(rndfor::RandomForestSurrogate, x_new, y_new)
+function SurrogatesBase.update!(rndfor::RandomForestSurrogate, x_new, y_new)
+    rndfor.x = vcat(rndfor.x, x_new)
+    rndfor.y = vcat(rndfor.y, y_new)
     if length(rndfor.lb) == 1
-        #1D
-        rndfor.x = vcat(rndfor.x, x_new)
-        rndfor.y = vcat(rndfor.y, y_new)
         rndfor.bst = xgboost((reshape(rndfor.x, length(rndfor.x), 1), rndfor.y);
             num_round = rndfor.num_round)
     else
-        n_previous = length(rndfor.x)
-        a = vcat(rndfor.x, x_new)
-        n_after = length(a)
-        dim_new = n_after - n_previous
-        n = length(rndfor.x)
-        d = length(rndfor.x[1])
-        tot_dim = n + dim_new
-        X = Array{Float64, 2}(undef, tot_dim, d)
-        for j in 1:n
-            X[j, :] = vec(collect(rndfor.x[j]))
-        end
-        if dim_new == 1
-            X[n + 1, :] = vec(collect(x_new))
-        else
-            i = 1
-            for j in (n + 1):tot_dim
-                X[j, :] = vec(collect(x_new[i]))
-                i = i + 1
-            end
-        end
-        rndfor.x = vcat(rndfor.x, x_new)
-        rndfor.y = vcat(rndfor.y, y_new)
-        rndfor.bst = xgboost((X, rndfor.y); num_round = rndfor.num_round)
+        rndfor.bst = xgboost(
+            (transpose(reduce(hcat, rndfor.x)), rndfor.y); num_round = rndfor.num_round)
     end
     nothing
 end
+
 end # module
diff --git a/lib/SurrogatesRandomForest/test/runtests.jl b/lib/SurrogatesRandomForest/test/runtests.jl
index 4c2aba6b9..310c31980 100644
--- a/lib/SurrogatesRandomForest/test/runtests.jl
+++ b/lib/SurrogatesRandomForest/test/runtests.jl
@@ -1,32 +1,35 @@
 using SafeTestsets
 
 @safetestset "RandomForestSurrogate" begin
-    using Surrogates, XGBoost
-    using Surrogates: sample, SobolSample
+    using Surrogates
     using SurrogatesRandomForest
-
-    #1D
-    obj_1D = x -> 3 * x + 1
-    x = [1.0, 2.0, 3.0, 4.0, 5.0]
-    y = obj_1D.(x)
-    a = 0.0
-    b = 10.0
-    num_round = 2
-    my_forest_1D = RandomForestSurrogate(x, y, a, b, num_round = 2)
-    my_forest_kwarg = RandomForestSurrogate(x, y, a, b)
-    val = my_forest_1D(3.5)
-    add_point!(my_forest_1D, 6.0, 19.0)
-    add_point!(my_forest_1D, [7.0, 8.0], obj_1D.([7.0, 8.0]))
-
-    #ND
-    lb = [0.0, 0.0, 0.0]
-    ub = [10.0, 10.0, 10.0]
-    x = sample(5, lb, ub, SobolSample())
-    obj_ND = x -> x[1] * x[2]^2 * x[3]
-    y = obj_ND.(x)
-    my_forest_ND = RandomForestSurrogate(x, y, lb, ub, num_round = 2)
-    my_forest_kwarg = RandomForestSurrogate(x, y, lb, ub)
-    val = my_forest_ND((1.0, 1.0, 1.0))
-    add_point!(my_forest_ND, (1.0, 1.0, 1.0), 1.0)
-    add_point!(my_forest_ND, [(1.2, 1.2, 1.0), (1.5, 1.5, 1.0)], [1.728, 3.375])
+    using Test
+    using XGBoost: xgboost, predict
+    @testset "1D" begin
+        obj_1D = x -> 3 * x + 1
+        x = [1.0, 2.0, 3.0, 4.0, 5.0]
+        y = obj_1D.(x)
+        a = 0.0
+        b = 10.0
+        num_round = 2
+        my_forest_1D = RandomForestSurrogate(x, y, a, b; num_round = 2)
+        xgboost1 = xgboost((reshape(x, length(x), 1), y); num_round = 2)
+        val = my_forest_1D(3.5)
+        @test predict(xgboost1, [3.5;;])[1] == val
+        update!(my_forest_1D, [6.0], [19.0])
+        update!(my_forest_1D, [7.0, 8.0], obj_1D.([7.0, 8.0]))
+    end
+    @testset "ND" begin
+        lb = [0.0, 0.0, 0.0]
+        ub = [10.0, 10.0, 10.0]
+        x = collect.(sample(5, lb, ub, SobolSample()))
+        obj_ND = x -> x[1] * x[2]^2 * x[3]
+        y = obj_ND.(x)
+        my_forest_ND = RandomForestSurrogate(x, y, lb, ub; num_round = 2)
+        xgboostND = xgboost((reduce(hcat, x)', y); num_round = 2)
+        val = my_forest_ND([1.0, 1.0, 1.0])
+        @test predict(xgboostND, reshape([1.0, 1.0, 1.0], 3, 1))[1] == val
+        update!(my_forest_ND, [[1.0, 1.0, 1.0]], [1.0])
+        update!(my_forest_ND, [[1.2, 1.2, 1.0], [1.5, 1.5, 1.0]], [1.728, 3.375])
+    end
 end
diff --git a/lib/SurrogatesSVM/src/SurrogatesSVM.jl b/lib/SurrogatesSVM/src/SurrogatesSVM.jl
index d69b365e0..a8320c8ae 100644
--- a/lib/SurrogatesSVM/src/SurrogatesSVM.jl
+++ b/lib/SurrogatesSVM/src/SurrogatesSVM.jl
@@ -40,6 +40,10 @@ function SVMSurrogate(x, y, lb, ub)
     SVMSurrogate(x, y, model, lb, ub)
 end
 
+function (svmsurr::SVMSurrogate)(val::Number)
+    return svmsurr([val])
+end
+
 function (svmsurr::SVMSurrogate)(val)
     n = length(val)
     return LIBSVM.predict(svmsurr.model, reshape(val, 1, n))[1]
@@ -54,7 +58,7 @@ end
   - `x_new`: Vector of new data points to be added to the training set of SVMSurrogate.
   - `y_new`: Vector of new output points to be added to the training set of SVMSurrogate.
 """
-function update!(svmsurr::SVMSurrogate, x_new, y_new)
+function SurrogatesBase.update!(svmsurr::SVMSurrogate, x_new, y_new)
     svmsurr.x = vcat(svmsurr.x, x_new)
     svmsurr.y = vcat(svmsurr.y, y_new)
     if length(svmsurr.lb) == 1
diff --git a/lib/SurrogatesSVM/test/runtests.jl b/lib/SurrogatesSVM/test/runtests.jl
index a15f1027d..002402278 100644
--- a/lib/SurrogatesSVM/test/runtests.jl
+++ b/lib/SurrogatesSVM/test/runtests.jl
@@ -18,7 +18,7 @@ using SafeTestsets
         update!(my_svm_1D, [3.1], [7.2])
         update!(my_svm_1D, [3.2, 3.5], [7.4, 8.0])
         svm = LIBSVM.fit!(SVC(), reshape(my_svm_1D.x, length(my_svm_1D.x), 1), my_svm_1D.y)
-        val = my_svm_1D([3.1])
+        val = my_svm_1D(3.1)
         @test LIBSVM.predict(svm, [3.1;;])[1] == val
     end
     @testset "ND" begin