diff --git a/requirements.txt b/requirements.txt
index 89906cc..ac2bce9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,6 +16,7 @@ django-jazzmin==2.4.8
 fonttools==4.29.1
 future==0.18.2
 html5lib==1.1
+icalendar==4.0.9
 idna==3.3
 lxml==4.8.0
 mysqlclient==2.1.0
@@ -28,10 +29,12 @@ pyhanko-certvalidator==0.19.5
 PyPDF3==1.0.6
 pyphen==0.12.0
 python-bidi==0.4.2
+python-dateutil==2.8.2
 pytz==2022.1
 pytz-deprecation-shim==0.1.0.post0
 PyYAML==6.0
 qrcode==7.3.1
+recurring-ical-events==1.0.2b0
 reportlab==3.6.9
 requests==2.27.1
 six==1.16.0
@@ -45,5 +48,6 @@ uritools==4.0.0
 urllib3==1.26.9
 weasyprint==54.1
 webencodings==0.5.1
+x-wr-timezone==0.0.5
 xhtml2pdf==0.2.7
 zopfli==0.1.9