diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index af75218bf7e..ff03cb95f0b 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -212,3 +212,8 @@ async-timeout==4.0.3
 # https://github.com/home-assistant/core/issues/122508
 # https://github.com/home-assistant/core/issues/118004
 aiofiles>=24.1.0
+
+# multidict < 6.4.0 has memory leaks
+# https://github.com/aio-libs/multidict/issues/1134
+# https://github.com/aio-libs/multidict/issues/1131
+multidict>=6.4.2
diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index acc87ec2731..f002b9b1b7f 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -241,6 +241,11 @@ async-timeout==4.0.3
 # https://github.com/home-assistant/core/issues/122508
 # https://github.com/home-assistant/core/issues/118004
 aiofiles>=24.1.0
+
+# multidict < 6.4.0 has memory leaks
+# https://github.com/aio-libs/multidict/issues/1134
+# https://github.com/aio-libs/multidict/issues/1131
+multidict>=6.4.2
 """
 
 GENERATED_MESSAGE = (