fix: cleanup requirements

diff --git a/dev_requirements.txt b/dev_requirements.txt
index 8588009..66e3d9a 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt

@@ -5,7 +5,7 @@
 sphinx_rtd_theme
 pytest
 pytest-cov
-casbin_sqlalchemy_adapter==0.3.2
+casbin_sqlalchemy_adapter>=0.3.2
 coverage
 pypi-publisher
-bumpversion
\ No newline at end of file
+bumpversion

diff --git a/requirements.in b/requirements.in
index f9fe35d..97e6a42 100644
--- a/requirements.in
+++ b/requirements.in

@@ -1,3 +1,3 @@
-casbin
-flask~=1.1.2
-PyJWT
\ No newline at end of file
+casbin>=1.0.0<2.0.0
+flask>=1.1.0<3.0.0
+PyJWT>=2.0.1

diff --git a/requirements.txt b/requirements.txt
index 521254a..97e6a42 100644
--- a/requirements.txt
+++ b/requirements.txt

@@ -1,9 +1,3 @@
-casbin==1.0.4
-click==7.1.2
-flask==1.1.2
-itsdangerous==1.1.0
-jinja2==2.11.3
-markupsafe==1.1.1
-pyjwt==2.0.1
-simpleeval==0.9.10
-werkzeug==1.0.1
+casbin>=1.0.0<2.0.0
+flask>=1.1.0<3.0.0
+PyJWT>=2.0.1