diff --git a/connectrpc-otel/pyproject.toml b/connectrpc-otel/pyproject.toml
index 9389b37..12baf24 100644
--- a/connectrpc-otel/pyproject.toml
+++ b/connectrpc-otel/pyproject.toml
@@ -52,7 +52,7 @@ dev = [
     # a transitive dependency, so we go ahead and leave it out.
     "connect-python>=0.8.0",
 
-    "opentelemetry-sdk==1.39.1",
+    "opentelemetry-sdk==1.40.0",
     "opentelemetry-instrumentation-asgi==0.60b1",
     "opentelemetry-instrumentation-wsgi==0.60b1",