diff --git a/dataframe-json.cabal b/dataframe-json.cabal
--- a/dataframe-json.cabal
+++ b/dataframe-json.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.4
 name:               dataframe-json
-version:            1.1.0.0
+version:            1.2.0.0
 
 synopsis:           JSON reader and writer for the dataframe ecosystem.
 description:
@@ -30,7 +30,7 @@
     build-depends:      base >= 4 && < 5,
                         aeson >= 0.11.0.0 && < 3,
                         bytestring >= 0.11 && < 0.14,
-                        dataframe-core:internal >= 2.0 && < 2.1,
+                        dataframe-core >= 2.1 && < 2.2,
                         scientific >= 0.3.1 && < 0.5,
                         text >= 2.1 && < 3,
                         vector >= 0.13 && < 0.15