diff --git a/src/cambridge/cambridge.make b/src/cambridge/cambridge.make
index 11cf257f14e662e2aac657c0963c4a1e2e52ef33..50141da1a0f442eedb821b8a388d98b036eaece9 100644
--- a/src/cambridge/cambridge.make
+++ b/src/cambridge/cambridge.make
@@ -9,6 +9,7 @@ projects[admin_menu] = "3.0-rc5"
 projects[advanced_help] = "1.2"
 projects[auto_entitylabel] = "1.3"
 projects[block_titlelink] = "1.3"
+projects[calendar] = "3.5"
 projects[ckeditor] = "1.16"
 libraries[ckeditor][download][type] = "file"
 libraries[ckeditor][download][url] = "http://download.cksource.com/CKEditor/CKEditor/CKEditor%204.4.7/ckeditor_4.4.7_full.tar.gz"