diff --git a/Project.toml b/Project.toml
index 75f581bd..b4dd7242 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "MLJBase"
 uuid = "a7f614a8-145f-11e9-1d2a-a57a1082229d"
 authors = ["Anthony D. Blaom <anthony.blaom@gmail.com>"]
-version = "0.18.2"
+version = "0.18.3"
 
 [deps]
 CategoricalArrays = "324d7699-5711-5eae-9e2f-1d82baa6b597"
@@ -28,7 +28,7 @@ StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [compat]
-CategoricalArrays = "0.8.1, 0.9"
+CategoricalArrays = "0.9, 0.10"
 ComputationalResources = "0.3"
 Distributions = "0.22, 0.23, 0.24"
 InvertedIndices = "1"
diff --git a/src/interface/data_utils.jl b/src/interface/data_utils.jl
index ea95a75b..92764cc7 100644
--- a/src/interface/data_utils.jl
+++ b/src/interface/data_utils.jl
@@ -17,9 +17,9 @@ MMI.int(::FI, x) = throw(
 MMI.int(::FI, x::Missing)       = missing
 MMI.int(::FI, x::AbstractArray) = int.(x)
 
-# first line is no good because it promotes type to higher ineger type:
+# first line is no good because it promotes type to larger integer type:
 # MMI.int(::FI, x::CategoricalValue) = CategoricalArrays.levelcode(x)
-MMI.int(::FI, x::CategoricalValue) = CategoricalArrays.level(x)
+MMI.int(::FI, x::CategoricalValue) = CategoricalArrays.refcode(x)
 
 # ------------------------------------------------------------------------
 # classes
diff --git a/test/resampling.jl b/test/resampling.jl
index 1e432f34..7eb81a25 100644
--- a/test/resampling.jl
+++ b/test/resampling.jl
@@ -321,7 +321,10 @@ end
     @test pairs != pairs_random
 
     # wrong target type throws error:
-    @test_throws Exception MLJBase.train_test_pairs(scv, rows, get.(y))
+    @test_throws(Exception,
+                 MLJBase.train_test_pairs(scv,
+                                          rows,
+                                          CategoricalArrays.unwrap.(y)))
 
     # check class distribution is preserved in a larger randomized example:
     N = 30