diff --git a/REQUIRE b/REQUIRE
index bb98e6de..028c6a91 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,10 +1,10 @@
-julia 0.7 1.0
+julia 1.0
 Optim 0.16.0
 PDMats 0.9.4
 Distributions 0.16.2
 Distances 0.7.3
 ScikitLearnBase 0.4.0
-RecipesBase 0.5.0 0.6
+RecipesBase 0.6
 FastGaussQuadrature 0.3.1
 StatsFuns 0.7.0
 SpecialFunctions 0.7.0
diff --git a/src/plot.jl b/src/plot.jl
index 071975da..80d8ff49 100644
--- a/src/plot.jl
+++ b/src/plot.jl
@@ -8,7 +8,7 @@
     @assert gp.dim ∈ (1,2)
     if gp.dim == 1
         xlims --> (minimum(gp.x), maximum(gp.x))
-        xmin, xmax = d[:xlims]
+        xmin, xmax = plotattributes[:xlims]
         x = range(xmin, stop=xmax, length=100)
         μ, Σ = predict_f(gp, x)
         y = μ
@@ -32,8 +32,8 @@
     else
         xlims --> (minimum(gp.x[1,:]), maximum(gp.x[1,:]))
         ylims --> (minimum(gp.x[2,:]), maximum(gp.x[2,:]))
-        xmin, xmax = d[:xlims]
-        ymin, ymax = d[:ylims]
+        xmin, xmax = plotattributes[:xlims]
+        ymin, ymax = plotattributes[:ylims]
         x = range(xmin, stop=xmax, length=50)
         y = range(ymin, stop=ymax, length=50)
         xgrid = repeat(x', 50, 1)