diff --git a/build-aux/org.gnome.Calendar.json b/build-aux/org.gnome.Calendar.json
index 8be6d29f..f19d23c3 100644
--- a/build-aux/org.gnome.Calendar.json
+++ b/build-aux/org.gnome.Calendar.json
@@ -102,8 +102,8 @@
             "sources" : [
                 {
                     "type" : "archive",
-                    "url" : "https://github.com/libical/libical/releases/download/v3.0.16/libical-3.0.16.tar.gz",
-                    "sha256" : "b44705dd71ca4538c86fb16248483ab4b48978524fb1da5097bd76aa2e0f0c33"
+                    "url" : "https://github.com/libical/libical/releases/download/v3.0.20/libical-3.0.20.tar.gz",
+                    "sha256" : "e73de92f5a6ce84c1b00306446b290a2b08cdf0a80988eca0a2c9d5c3510b4c2"
                 }
             ]
         },