diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index d5a4b732..1d8c8f18 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release History
 
+## 2.4.2 (2019-12-13)
+
+**Changed**
+
+- refactor: replace with open file handler, avoid reading files into memory
+
 ## 2.4.1 (2019-12-12)
 
 **Added**
diff --git a/httprunner/__init__.py b/httprunner/__init__.py
index ef6aac10..8be0e197 100644
--- a/httprunner/__init__.py
+++ b/httprunner/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.4.1"
+__version__ = "2.4.2"
 __description__ = "One-stop solution for HTTP(S) testing."
 
 __all__ = ["__version__", "__description__"]
diff --git a/httprunner/ext/uploader/__init__.py b/httprunner/ext/uploader/__init__.py
index 404d635b..fb299b1d 100644
--- a/httprunner/ext/uploader/__init__.py
+++ b/httprunner/ext/uploader/__init__.py
@@ -128,9 +128,10 @@ def multipart_encoder(**kwargs):
         if is_exists_file:
             # value is file path to upload
             filename = os.path.basename(_file_path)
-            with open(_file_path, 'rb') as f:
-                mime_type = get_filetype(_file_path)
-                fields_dict[key] = (filename, f.read(), mime_type)
+            mime_type = get_filetype(_file_path)
+            # TODO: fix ResourceWarning for unclosed file
+            file_handler = open(_file_path, 'rb')
+            fields_dict[key] = (filename, file_handler, mime_type)
         else:
             fields_dict[key] = value
 
diff --git a/pyproject.toml b/pyproject.toml
index 168a025b..3bbc6e33 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "httprunner"
-version = "2.4.1"
+version = "2.4.2"
 description = "One-stop solution for HTTP(S) testing."
 license = "Apache-2.0"
 readme = "README.md"