diff --git a/requirements.txt b/requirements.txt
index 7e9c3da0..c52e6d7c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-pyjwt==1.7.1
+pyjwt>=2.0.0,<3
 blinker==1.4
-cryptography>=1.4.0
+cryptography>=3.0.0,<4
diff --git a/setup.py b/setup.py
index fed58140..124d5348 100755
--- a/setup.py
+++ b/setup.py
@@ -16,8 +16,8 @@ def fread(fn):
         return f.read()
 
 
-rsa_require = ['cryptography>=1.4.0']
-signedtoken_require = ['cryptography>=1.4.0', 'pyjwt>=1.6.0']
+rsa_require = ['cryptography>=3.0.0,<4']
+signedtoken_require = ['cryptography>=3.0.0,<4', 'pyjwt>=2.0.0,<3']
 signals_require = ['blinker>=1.4.0']
 
 setup(