diff --git a/dev-requirements.txt b/dev-requirements.txt
index 20ef2ce886..17f226d611 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -39,7 +39,7 @@ docutils==0.21.2
 dunamai==1.23.1
 email_validator==2.2.0
 epicscorelibs==7.0.7.99.1.2a1
-event-model==1.22.3
+event-model==1.23
 fastapi==0.115.12
 fastapi-cli==0.0.7
 filelock==3.18.0
diff --git a/pyproject.toml b/pyproject.toml
index ef2f9ff075..3417d1dd19 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,8 +28,8 @@ dependencies = [
     "dls-dodal>=1.46.0",
     "super-state-machine",                           # https://github.com/DiamondLightSource/blueapi/issues/553
     "GitPython",
+    "event-model==1.23",                           # https://github.com/DiamondLightSource/blueapi/issues/684
     "bluesky-stomp>=0.1.6",
-    "event-model==1.22.3",                           # https://github.com/DiamondLightSource/blueapi/issues/684
     "opentelemetry-distro>=0.48b0",
     "opentelemetry-instrumentation-fastapi>=0.48b0",
     "observability-utils>=0.1.4",