diff --git a/packages/app-shell/package.json b/packages/app-shell/package.json
index 2d2fc65456addd9bfe525720b0b8b1b5e52c49c5..1aa29aaee226e63cf8d3eec2bf4d9e66c3d49611 100644
--- a/packages/app-shell/package.json
+++ b/packages/app-shell/package.json
@@ -42,6 +42,7 @@
         "@dbp-toolkit/matomo": "^0.2.2",
         "@dbp-toolkit/notification": "^0.3.0",
         "@dbp-toolkit/person-profile": "^0.2.2",
+        "@dbp-toolkit/theme-switcher": "^0.0.3",
         "@open-wc/scoped-elements": "^2.1.0",
         "i18next": "^21.4.2",
         "lit": "^2.0.0",
diff --git a/yarn.lock b/yarn.lock
index 7cf9b1d497460d2ec7a9df0b6edb10f3dbfbfc4b..517db04026b1b86cce3e7d32e2341b383f473292 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2026,6 +2026,14 @@
   resolved "https://registry.yarnpkg.com/@open-wc/dedupe-mixin/-/dedupe-mixin-1.3.1.tgz#5c1a1eeb0386b344290ebe3f1fca0c4869933dbf"
   integrity sha512-ukowSvzpZQDUH0Y3znJTsY88HkiGk3Khc0WGpIPhap1xlerieYi27QBg6wx/nTurpWfU6XXXsx9ocxDYCdtw0Q==
 
+"@open-wc/scoped-elements@^2.0.0":
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/@open-wc/scoped-elements/-/scoped-elements-2.1.2.tgz#380b0fd8ad7d3c90af7ceae30f2f559082b3bc16"
+  integrity sha512-xQkR2m8sjmd0/wIMEAaGK5gJXeb7HAigQCIcnDhA0eRs3h0/YC90ZjTUsChQi2iLX7436BqRERW22PVxj6h07g==
+  dependencies:
+    "@lit/reactive-element" "^1.0.0"
+    "@open-wc/dedupe-mixin" "^1.3.0"
+
 "@open-wc/scoped-elements@^2.1.0":
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/@open-wc/scoped-elements/-/scoped-elements-2.1.1.tgz#a43a2167d259af1f113301fcc93b1b9a6c371991"