diff --git a/README.rst b/README.rst
index afe17b7..2ac8068 100644
--- a/README.rst
+++ b/README.rst
@@ -49,7 +49,7 @@ Pycaching has following requirements:
 .. code::
 
     Python>=3.4
-    requests>=2.8
+    requests>=2.8, <=2.21
     beautifulsoup4>=4.4
     geopy>=1.11
 
diff --git a/setup.py b/setup.py
index 2b55052..6d1d062 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@ def run(self):
     "description":         "Geocaching.com site crawler. Provides tools for searching, fetching caches and geocoding.",
     "long_description":    long_description,
     "keywords":            ["geocaching", "crawler", "geocache", "cache", "search", "geocode", "travelbug"],
-    "install_requires":    ["requests>=2.8", "beautifulsoup4>=4.4", "geopy>=1.11"],
+    "install_requires":    ["requests>=2.8, <=2.21", "beautifulsoup4>=4.4", "geopy>=1.11"],
     "tests_require":       ["betamax >=0.8, <0.9", "betamax-serializers >=0.2, <0.3"],
     "setup_requires":      ["nose", "flake8<3.0.0", "coverage"],  # flake8 >= 3.0 has incompatible API
     "cmdclass":            {"test": NoseTestCommand, "lint": LintCommand},