diff --git a/dataframe-learn.cabal b/dataframe-learn.cabal
--- a/dataframe-learn.cabal
+++ b/dataframe-learn.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.4
 name:               dataframe-learn
-version:            1.0.0.0
+version:            1.0.1.0
 
 synopsis:           Decision trees and feature synthesis for the dataframe ecosystem.
 description:
@@ -23,6 +23,7 @@
         -Wincomplete-uni-patterns
         -Wunused-imports
         -Wunused-local-binds
+        -Wunused-packages
 
 library
     import:             warnings
diff --git a/src/DataFrame/Synthesis.hs b/src/DataFrame/Synthesis.hs
--- a/src/DataFrame/Synthesis.hs
+++ b/src/DataFrame/Synthesis.hs
@@ -37,7 +37,6 @@
 import qualified Data.Text as T
 import Data.Type.Equality
 import qualified Data.Vector.Unboxed as VU
-import qualified DataFrame.Operations.Core as D
 import DataFrame.Operators
 import Debug.Trace (trace)
 import Type.Reflection (typeRep)