diff --git a/packages/backend/package.json b/packages/backend/package.json
index 2c61038b16..8fe04a45dd 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -121,7 +121,7 @@
 		"fluent-ffmpeg": "2.1.3",
 		"form-data": "4.0.4",
 		"got": "14.4.9",
-		"happy-dom": "20.0.0",
+		"happy-dom": "16.8.1",
 		"hpagent": "1.2.0",
 		"htmlescape": "1.1.1",
 		"http-link-header": "1.1.3",
diff --git a/packages/frontend-embed/package.json b/packages/frontend-embed/package.json
index 348d50127d..26557934dd 100644
--- a/packages/frontend-embed/package.json
+++ b/packages/frontend-embed/package.json
@@ -56,7 +56,7 @@
 		"eslint-plugin-import": "2.32.0",
 		"eslint-plugin-vue": "10.5.0",
 		"fast-glob": "3.3.3",
-		"happy-dom": "20.0.0",
+		"happy-dom": "19.0.2",
 		"intersection-observer": "0.12.2",
 		"micromatch": "4.0.8",
 		"msw": "2.11.3",
diff --git a/packages/frontend/package.json b/packages/frontend/package.json
index 74ab93515a..20842bc450 100644
--- a/packages/frontend/package.json
+++ b/packages/frontend/package.json
@@ -127,7 +127,7 @@
 		"eslint-plugin-import": "2.32.0",
 		"eslint-plugin-vue": "10.5.0",
 		"fast-glob": "3.3.3",
-		"happy-dom": "20.0.0",
+		"happy-dom": "19.0.2",
 		"intersection-observer": "0.12.2",
 		"micromatch": "4.0.8",
 		"minimatch": "10.0.3",