diff --git a/requirements.txt b/requirements.txt
index f3f0e8d..5cdf159 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-aiohttp>=3.8.1<4.0.0
-httpx>=0.20.0<1.0.0
+aiohttp>=3.8.1,<4.0.0
+httpx>=0.20.0,<1.0.0
 sphinx-rtd-theme==0.4.1
diff --git a/setup.py b/setup.py
index 506925e..adc8317 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
     packages=find_packages('src'),
     python_requires=">=3.6",
     install_requires=[
-        'aiohttp>=3.8.1<4.0.0'
-        'httpx>=0.20.0<1.0.0',
+        'aiohttp>=3.8.1,<4.0.0',
+        'httpx>=0.20.0,<1.0.0'
     ],
 )