diff --git a/Pipfile b/Pipfile
new file mode 100644
index 0000000..29222cc
--- /dev/null
+++ b/Pipfile
@@ -0,0 +1,19 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+httpx = {extras = ["http2"], version = "*"}
+protobuf = "==3.14.0"
+pytz = "*"
+urllib3 = "*"
+
+[dev-packages]
+pytest-mock = "*"
+pytest-httpx = "*"
+wheel = "*"
+twine = "*"
+
+[requires]
+python_version = ">=3.6"
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..e3efd46
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,425 @@
+{
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+        "requires": {
+            "python_version": ">=3.6"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
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+            ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.10.2"
+        },
+        "tqdm": {
+            "hashes": [
+                "sha256:18d6a615aedd09ec8456d9524489dab330af4bd5c2a14a76eb3f9a0e14471afe",
+                "sha256:80d9d5165d678dbd027dd102dfb99f71bf05f333b61fb761dbba13b4ab719ead"
+            ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==4.52.0"
+        },
+        "twine": {
+            "hashes": [
+                "sha256:34352fd52ec3b9d29837e6072d5a2a7c6fe4290e97bba46bb8d478b5c598f7ab",
+                "sha256:ba9ff477b8d6de0c89dd450e70b2185da190514e91c42cc62f96850025c10472"
+            ],
+            "index": "pypi",
+            "version": "==3.2.0"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08",
+                "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"
+            ],
+            "index": "pypi",
+            "version": "==1.26.2"
+        },
+        "webencodings": {
+            "hashes": [
+                "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78",
+                "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"
+            ],
+            "version": "==0.5.1"
+        },
+        "wheel": {
+            "hashes": [
+                "sha256:497add53525d16c173c2c1c733b8f655510e909ea78cc0e29d374243544b77a2",
+                "sha256:99a22d87add3f634ff917310a3d87e499f19e663413a52eb9232c447aa646c9f"
+            ],
+            "index": "pypi",
+            "version": "==0.35.1"
+        }
+    }
+}
diff --git a/pytchat/__init__.py b/pytchat/__init__.py
index d3550b4..918a216 100644
--- a/pytchat/__init__.py
+++ b/pytchat/__init__.py
@@ -2,7 +2,7 @@
 pytchat is a lightweight python library to browse youtube livechat without Selenium or BeautifulSoup.
 """
 __copyright__    = 'Copyright (C) 2019, 2020 taizan-hokuto'
-__version__      = '0.4.6'
+__version__      = '0.4.7'
 __license__      = 'MIT'
 __author__       = 'taizan-hokuto'
 __author_email__ = '55448286+taizan-hokuto@users.noreply.github.com'
diff --git a/requirements.txt b/requirements.txt
index 28c33c7..e5724d4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-httpx[http2]==0.16.1
+httpx[http2]
 protobuf==3.14.0
 pytz
 urllib3
\ No newline at end of file
diff --git a/requirements_test.txt b/requirements_test.txt
index 2a6ca06..c999ca2 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,2 +1,2 @@
-pytest-mock==3.3.1
-pytest-httpx==0.10.0
+pytest-mock
+pytest-httpx
diff --git a/tests/testdata/default/jsonified_item.json b/tests/testdata/default/jsonified_item.json
deleted file mode 100644
index e1e0d31..0000000
--- a/tests/testdata/default/jsonified_item.json
+++ /dev/null
@@ -1 +0,0 @@
-{"author": {"badgeUrl": "", "type": "", "isVerified": false, "isChatOwner": false, "isChatSponsor": false, "isChatModerator": false, "channelId": "author_channel_id", "channelUrl": "http://www.youtube.com/channel/author_channel_id", "name": "author_name", "imageUrl": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s64-x-x-xx-xx-xx-c0xffffff/photo.jpg"}, "type": "superChat", "id": "dummy_id", "timestamp": 1570678496000, "elapsedTime": "", "datetime": "2019-10-10 12:34:56", "message": "dummy_message", "messageEx": ["dummy_message"], "amountValue": 800.0, "amountString": "￥800", "currency": "JPY", "bgColor": 4280150454, "colors": {"headerBackgroundColor": 4278239141, "headerTextColor": 4278190080, "bodyBackgroundColor": 4280150454, "bodyTextColor": 4278190080, "timestampColor": 2147483648, "authorNameTextColor": 2315255808}}
\ No newline at end of file
diff --git a/tests/testdata/default/jsonified_list.json b/tests/testdata/default/jsonified_list.json
deleted file mode 100644
index 3d6fe70..0000000
--- a/tests/testdata/default/jsonified_list.json
+++ /dev/null
@@ -1 +0,0 @@
-[{"author": {"badgeUrl": "", "type": "", "isVerified": false, "isChatOwner": false, "isChatSponsor": false, "isChatModerator": false, "channelId": "author_channel_id", "channelUrl": "http://www.youtube.com/channel/author_channel_id", "name": "author_name", "imageUrl": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s64-x-x-xx-xx-xx-c0xffffff/photo.jpg"}, "type": "superChat", "id": "dummy_id", "timestamp": 1570678496000, "elapsedTime": "", "datetime": "2019-10-10 12:34:56", "message": "dummy_message", "messageEx": ["dummy_message"], "amountValue": 800.0, "amountString": "￥800", "currency": "JPY", "bgColor": 4280150454, "colors": {"headerBackgroundColor": 4278239141, "headerTextColor": 4278190080, "bodyBackgroundColor": 4280150454, "bodyTextColor": 4278190080, "timestampColor": 2147483648, "authorNameTextColor": 2315255808}}]
\ No newline at end of file