diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5550852..9eef4fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,12 @@ Changes are grouped as follows
 - `Fixed` for any bug fixes.
 - `Security` in case of vulnerabilities.
 
+## [0.6.6] - 2024-09-30
+
+## Fixed
+
+- Bug where DataFrame did not allow nan values.
+
 ## [0.6.5] - 2024-09-17
 
 ## Fixed
diff --git a/src/pyclarify/__init__.py b/src/pyclarify/__init__.py
index 892ba6a..0b09a9b 100644
--- a/src/pyclarify/__init__.py
+++ b/src/pyclarify/__init__.py
@@ -25,5 +25,5 @@
 )
 import pyclarify.query
 
-__version__ = "0.6.5"
+__version__ = "0.6.6"
 __API_version__ = "1.1"
diff --git a/src/pyclarify/views/dataframe.py b/src/pyclarify/views/dataframe.py
index bf4c36d..75b14a5 100644
--- a/src/pyclarify/views/dataframe.py
+++ b/src/pyclarify/views/dataframe.py
@@ -354,7 +354,7 @@ def __add__(self, other):
         except TypeError as e:
             raise TypeError(source=self, other=other) from e
 
-    model_config = ConfigDict(allow_inf_nan=False, json_encoders={datetime: time_to_string}, extra="forbid") 
+    model_config = ConfigDict(ser_json_inf_nan='null', json_encoders={datetime: time_to_string}, extra="forbid") 
 
 DataFrame.model_rebuild()