diff --git a/.travis.yml b/.travis.yml
index 2650716..7eedd87 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-dist: xenial
+dist: bionic
 sudo: false
 language: python
 
@@ -6,10 +6,11 @@ python:
   - "3.7"
   - "3.8"
   - "3.9"
+  - "3.10"
 
 install:
   # to fix https://travis-ci.community/t/build-error-for-python-3-7-on-two-different-projects/12895
-  - pip install importlib_metadata -U
+  # - pip install importlib_metadata -U
   - pip install -r requirements-dev.txt -U
   - pip install -e .
 
diff --git a/pydantic_collections/__init__.py b/pydantic_collections/__init__.py
index eb98664..3bdb904 100644
--- a/pydantic_collections/__init__.py
+++ b/pydantic_collections/__init__.py
@@ -1,5 +1,5 @@
 __title__ = 'pydantic-collections'
-__version__ = '0.3.0'
+__version__ = '0.4.0'
 
 from ._base_collection_model import BaseCollectionModel
 
diff --git a/pydantic_collections/_base_collection_model.py b/pydantic_collections/_base_collection_model.py
index 7cc002d..e4e31f0 100644
--- a/pydantic_collections/_base_collection_model.py
+++ b/pydantic_collections/_base_collection_model.py
@@ -126,7 +126,10 @@ def __len__(self):
         return len(self.__root__)
 
     def __getitem__(self, index):
-        return self.__root__[index]
+        if isinstance(index, slice):
+            return self.__class__(self.__root__[index])
+        else:
+            return self.__root__[index]
 
     def __setitem__(self, index, value):
         self.__root__[index] = self._validate_element(value, index)