diff --git a/requirements.txt b/requirements.txt
index c9985e58..fe3c9aa7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
 
 # First level requirements
-imapclient>=2.3.0<3
+imapclient>=2.3.0,<3
 olefile==0.46
 tzlocal==4.2
 compressed_rtf==1.0.6
 ebcdic==1.1.1
-beautifulsoup4>=4.11.1<4.12
+beautifulsoup4>=4.11.1,<4.12
 RTFDE==0.0.2
-chardet>=4.0.0<6
+chardet>=4.0.0,<6
 red-black-tree-mod==1.20