diff --git a/setup.py b/setup.py
index f4d0fc4..04a3c7a 100644
--- a/setup.py
+++ b/setup.py
@@ -14,10 +14,10 @@ package_data = \
 {'': ['*']}
 
 install_requires = \
-['click>=7.0,<9.0',
- 'cryptography>=2.1,<39',
- 'fido2>=0.9,<2.0',
- 'pyscard>=1.9,<3.0']
+['click<9.0',
+ 'cryptography<40',
+ 'fido2<2.0',
+ 'pyscard<3.0']
 
 extras_require = \
 {':python_version < "3.7"': ['dataclasses>=0.8,<0.9'],
diff --git a/pyproject.toml b/pyproject.toml
index bc3c657..604979a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,11 +29,11 @@ packages = [
 [tool.poetry.dependencies]
 python = "^3.6"
 dataclasses = {version = "^0.8", python = "<3.7"}
-cryptography = ">=2.1, <39"
+cryptography = "<40"
 pyOpenSSL = {version = ">=0.15.1", optional = true}
-pyscard = "^1.9 || ^2.0"
-fido2 = ">=0.9, <2.0"
-click = "^7.0 || ^8.0"
+pyscard = "<3.0"
+fido2 = "<2.0"
+click = "<9.0"
 pywin32 = {version = ">=223", platform = "win32"}
 
 [tool.poetry.dev-dependencies]