diff --git a/package.json b/package.json
index 6846e4824..ce718caeb 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "angular-sanitize": "^1.8.3",
     "angular-ui-bootstrap": "^2.5.0",
     "autosize": "^5.0.2",
-    "fullcalendar": "^3.10.5",
+    "fullcalendar": "^6.1.20",
     "hsl_rgb_converter": "o-klp/hsl_rgb_converter",
     "ical.js": "DeepDiver1975/ical.js#timezone-fix-and-build",
     "jquery-timepicker": "fgelinas/timepicker#883bb2cd94",
diff --git a/yarn.lock b/yarn.lock
index 29ca37dc2..ba466cb72 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -255,6 +255,42 @@
     "@babel/helper-validator-identifier" "^7.22.20"
     to-fast-properties "^2.0.0"
 
+"@fullcalendar/core@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/core/-/core-6.1.20.tgz#e4cfa767a9b8b7dad015b33fcb8acb0fac986a85"
+  integrity sha512-1cukXLlePFiJ8YKXn/4tMKsy0etxYLCkXk8nUCFi11nRONF2Ba2CD5b21/ovtOO2tL6afTJfwmc1ed3HG7eB1g==
+  dependencies:
+    preact "~10.12.1"
+
+"@fullcalendar/daygrid@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/daygrid/-/daygrid-6.1.20.tgz#fcf33af4ea908b46fd755414278341811e01bdf8"
+  integrity sha512-AO9vqhkLP77EesmJzuU+IGXgxNulsA8mgQHynclJ8U70vSwAVnbcLG9qftiTAFSlZjiY/NvhE7sflve6cJelyQ==
+
+"@fullcalendar/interaction@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/interaction/-/interaction-6.1.20.tgz#a73a53af5f93ac261f864b025ae80201609f1cd7"
+  integrity sha512-p6txmc5txL0bMiPaJxe2ip6o0T384TyoD2KGdsU6UjZ5yoBlaY+dg7kxfnYKpYMzEJLG58n+URrHr2PgNL2fyA==
+
+"@fullcalendar/list@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/list/-/list-6.1.20.tgz#d218906f0c50e1a7232a176df2426269f8601319"
+  integrity sha512-7Hzkbb7uuSqrXwTyD0Ld/7SwWNxPD6SlU548vtkIpH55rZ4qquwtwYdMPgorHos5OynHA4OUrZNcH51CjrCf2g==
+
+"@fullcalendar/multimonth@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/multimonth/-/multimonth-6.1.20.tgz#1d6add6285222751324868de1cb02371f4ad2330"
+  integrity sha512-rMMiPBA71lUJ1DV/0ckPtN4/G4LozkkDKoG7/CbmTYqFJiMRskM/1WpilhtRn4iUdNe03V5K7ofFQRs0wo4ZtQ==
+  dependencies:
+    "@fullcalendar/daygrid" "~6.1.20"
+
+"@fullcalendar/timegrid@~6.1.20":
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/@fullcalendar/timegrid/-/timegrid-6.1.20.tgz#929813235375c2fa3b387691ef5b1dcbb7b86dde"
+  integrity sha512-4H+/MWbz3ntA50lrPif+7TsvMeX3R1GSYjiLULz0+zEJ7/Yfd9pupZmAwUs/PBpA6aAcFmeRr0laWfcz1a9V1A==
+  dependencies:
+    "@fullcalendar/daygrid" "~6.1.20"
+
 "@gulp-sourcemaps/identity-map@^2.0.1":
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/@gulp-sourcemaps/identity-map/-/identity-map-2.0.1.tgz#a6e8b1abec8f790ec6be2b8c500e6e68037c0019"
@@ -2262,10 +2298,17 @@ fsevents@~2.1.2:
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.1.2.tgz#4c0a1fb34bc68e543b4b82a9ec392bfbda840805"
   integrity sha512-R4wDiBwZ0KzpgOWetKDug1FZcYhqYnUYKtfZYt4mD5SBz76q0KR4Q9o7GIPamsVPGmW3EYPPJ0dOOjvx32ldZA==
 
-fullcalendar@^3.10.5:
-  version "3.10.5"
-  resolved "https://registry.yarnpkg.com/fullcalendar/-/fullcalendar-3.10.5.tgz#57a3a64d7d744181582bb9e1be32d1846e1db53a"
-  integrity sha512-JGWpECKgza/344bbF5QT0hBJpx04DZ/7QGPlR1ZbAwrG6Yz6mWEkQd+NnZUh1sK6HCBIPnPRW2x53aJxeLGvvQ==
+fullcalendar@^6.1.20:
+  version "6.1.20"
+  resolved "https://registry.yarnpkg.com/fullcalendar/-/fullcalendar-6.1.20.tgz#49df7c39affba29b4386934b7b1bf9408e9a8f41"
+  integrity sha512-7lz2P+0YdA86fBTwfr/ducajrM3zUw5o6uoiiYk9xMqcoTf003xBh3mpzW5om9slfAMwGgCBh0KsiYcU1JY1eQ==
+  dependencies:
+    "@fullcalendar/core" "~6.1.20"
+    "@fullcalendar/daygrid" "~6.1.20"
+    "@fullcalendar/interaction" "~6.1.20"
+    "@fullcalendar/list" "~6.1.20"
+    "@fullcalendar/multimonth" "~6.1.20"
+    "@fullcalendar/timegrid" "~6.1.20"
 
 function-bind@^1.1.1:
   version "1.1.1"
@@ -2767,9 +2810,10 @@ hosted-git-info@^2.1.4:
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.8.9.tgz#dffc0bf9a21c02209090f2aa69429e1414daf3f9"
   integrity sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==
 
-hsl_rgb_converter@kayellpeee/hsl_rgb_converter:
+hsl_rgb_converter@o-klp/hsl_rgb_converter:
   version "1.0.0"
-  resolved "https://codeload.github.com/kayellpeee/hsl_rgb_converter/tar.gz/3936a3896dd2f45a5c66317aab6f9175c9fde9fb"
+  uid "3936a3896dd2f45a5c66317aab6f9175c9fde9fb"
+  resolved "https://codeload.github.com/o-klp/hsl_rgb_converter/tar.gz/3936a3896dd2f45a5c66317aab6f9175c9fde9fb"
 
 html-escaper@^2.0.0:
   version "2.0.0"
@@ -4270,6 +4314,11 @@ postcss@^7.0.16:
     picocolors "^0.2.1"
     source-map "^0.6.1"
 
+preact@~10.12.1:
+  version "10.12.1"
+  resolved "https://registry.yarnpkg.com/preact/-/preact-10.12.1.tgz#8f9cb5442f560e532729b7d23d42fd1161354a21"
+  integrity sha512-l8386ixSsBdbreOAkqtrwqHwdvR35ID8c3rKPa8lCWuO86dBi32QWHV4vfsZK1utLLFMvw+Z5Ad4XLkZzchscg==
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"