diff --git a/requirements.txt b/requirements.txt
index bb63a69c..870ea3b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 beautifulsoup4~=4.7.1
 Django~=2.2.15
 django-bootstrap-datepicker-plus~=3.0.5
-django-cas-server~=0.9.0
+django-cas-server>=0.9.0
 django-colorfield~=0.3.2
 django-crispy-forms~=1.7.2
 django-extensions~=2.1.4
@@ -14,4 +14,4 @@ djangorestframework~=3.9.0
 django-rest-polymorphic~=0.1.9
 django-tables2~=2.3.1
 phonenumbers~=8.9.10
-Pillow~=5.4.1
+Pillow>=5.4.1