diff --git a/dataframe-csv.cabal b/dataframe-csv.cabal
--- a/dataframe-csv.cabal
+++ b/dataframe-csv.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.4
 name:               dataframe-csv
-version:            2.0.0.0
+version:            2.1.0.0
 synopsis:           CSV reader and writer for the dataframe ecosystem.
 description:
     @DataFrame.IO.CSV@ — strict single-pass CSV read/write (pure
@@ -24,23 +24,12 @@
         -Wunused-local-binds
         -Wunused-packages
 
-library internal
-    import:             warnings
-    visibility:         public
-    exposed-modules:    DataFrame.IO.Internal.MutableColumn
-    build-depends:      base >= 4 && < 5,
-                        dataframe-core:internal >= 2.0 && < 2.1,
-                        dataframe-parsing:internal >= 2.0 && < 2.1,
-                        text >= 2.1 && < 3,
-                        vector >= 0.13 && < 0.15
-    hs-source-dirs:     src-internal
-    default-language:   Haskell2010
-
 library
     import:             warnings
     exposed-modules:
                         DataFrame.IO.CSV
                         DataFrame.Typed.IO.CSV
+                        DataFrame.IO.Internal.MutableColumn
     other-modules:
                         DataFrame.IO.CSV.Internal.Infer
                         DataFrame.IO.CSV.Internal.Options
@@ -50,13 +39,11 @@
     build-depends:      base >= 4 && < 5,
                         bytestring >= 0.11 && < 0.14,
                         containers >= 0.6.7 && < 0.10,
-                        dataframe-core >= 2.0 && < 2.1,
-                        dataframe-core:internal >= 2.0 && < 2.1,
-                        dataframe-operations >= 2.0 && < 2.1,
-                        dataframe-parsing >= 2.0 && < 2.1,
-                        dataframe-parsing:internal >= 2.0 && < 2.1,
+                        dataframe-core >= 2.1 && < 2.2,
+                        dataframe-operations >= 2.1 && < 2.2,
+                        dataframe-parsing >= 2.1 && < 2.2,
                         text >= 2.1 && < 3,
                         time >= 1.12 && < 2,
                         vector >= 0.13 && < 0.15
-    hs-source-dirs:     src
+    hs-source-dirs:     src, src-internal
     default-language:   Haskell2010