diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index c931a51379add9..8377bea2e8ebdc 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -30,7 +30,7 @@ janus==1.0.0
 Jinja2==3.1.2
 lru-dict==1.2.0
 mutagen==1.47.0
-orjson==3.9.7
+orjson==3.9.9
 packaging>=23.1
 paho-mqtt==1.6.1
 Pillow==10.0.1
diff --git a/pyproject.toml b/pyproject.toml
index 5128a06479bae2..98ebc5e084c169 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ dependencies    = [
     "cryptography==41.0.4",
     # pyOpenSSL 23.2.0 is required to work with cryptography 41+
     "pyOpenSSL==23.2.0",
-    "orjson==3.9.7",
+    "orjson==3.9.9",
     "packaging>=23.1",
     "pip>=21.3.1",
     "python-slugify==4.0.1",
diff --git a/requirements.txt b/requirements.txt
index 6379de304e8bf5..b4f97461bbf67a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ lru-dict==1.2.0
 PyJWT==2.8.0
 cryptography==41.0.4
 pyOpenSSL==23.2.0
-orjson==3.9.7
+orjson==3.9.9
 packaging>=23.1
 pip>=21.3.1
 python-slugify==4.0.1