diff --git a/requirements.txt b/requirements.txt
index 372c85f..ec1c01f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-icalendar==4.0.2
-Markdown==2.6.11
-pelican==3.7.1
-beautifulsoup4==4.6.3
-html5lib==1.0.1
-Pillow==6.1.0
+Markdown==3.3.3
+Pillow==8.1
+beautifulsoup4==4.9.3
+html5lib==1.1
+icalendar==4.0.7
+pelican==4.5.4