diff --git a/connectrpc-otel/pyproject.toml b/connectrpc-otel/pyproject.toml
index db687fb..5509d95 100644
--- a/connectrpc-otel/pyproject.toml
+++ b/connectrpc-otel/pyproject.toml
@@ -39,7 +39,7 @@ dependencies = ["connect-python>=0.8.0", "opentelemetry-api>=1.39.1"]
 
 [dependency-groups]
 dev = [
-    "opentelemetry-sdk==1.39.1",
+    "opentelemetry-sdk==1.40.0",
     "opentelemetry-instrumentation-asgi==0.60b1",
     "opentelemetry-instrumentation-wsgi==0.60b1",