diff --git a/requirements.txt b/requirements.txt
index 5d508d7..f6b7f37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,12 @@
-certifi==2020.4.5.1
-babel==2.7.0
-flask-babel==1.0.0
-flask==1.1.2
-idna==2.9
-jinja2==2.11.1
-lxml==4.5.0
-pygments==2.1.3
-pyopenssl==19.1.0
-python-dateutil==2.8.0
-pyyaml==5.3.1
-requests[socks]==2.23.0
+certifi>=2020.4.5.1
+babel>=2.7.0<3
+flask-babel>=1.0.0<2
+flask>=1.1.2<2
+idna>=2.9<3
+jinja2>=2.11.1<3
+lxml>=4.5.0<5
+pygments>=2.1.3<3
+pyopenssl>=19.1.0<20
+python-dateutil>=2.8.0<3
+pyyaml>=5.3.1<6
+requests[socks]>=2.23.0<3