diff --git a/function/main.py b/function/main.py
index 6ed41d7..3b5e2e2 100644
--- a/function/main.py
+++ b/function/main.py
@@ -32,7 +32,28 @@
         "If you supply this flag --tls-certs-dir will be ignored."
     ),
 )
-def cli(debug: bool, address: str, tls_certs_dir: str, insecure: bool) -> None:  # noqa:FBT001  # We only expect callers via the CLI.
+@click.option(
+    "--max-recv-message-size",
+    default=4,
+    show_default=True,
+    type=click.INT,
+    help=("Maximum size of received messages in MB."),
+)
+@click.option(
+    "--max-send-message-size",
+    default=4,
+    show_default=True,
+    type=click.INT,
+    help=("Maximum size of sent messages in MB."),
+)
+def cli(  # noqa: PLR0913
+    debug: bool,  # noqa: FBT001
+    address: str,
+    tls_certs_dir: str,
+    insecure: bool,  # noqa: FBT001
+    max_recv_message_size: int,
+    max_send_message_size: int,
+) -> None:  # We only expect callers via the CLI.
     """A Crossplane composition function."""
     try:
         level = logging.Level.INFO
@@ -44,6 +65,16 @@ def cli(debug: bool, address: str, tls_certs_dir: str, insecure: bool) -> None:
             address,
             creds=runtime.load_credentials(tls_certs_dir),
             insecure=insecure,
+            options=[
+                (
+                    "grpc.max_receive_message_length",
+                    1024 * 1024 * max_recv_message_size,
+                ),
+                (
+                    "grpc.max_send_message_length",
+                    1024 * 1024 * max_send_message_size,
+                ),
+            ],
         )
     except Exception as e:
         click.echo(f"Cannot run function: {e}")
diff --git a/pyproject.toml b/pyproject.toml
index 6b43b77..419260b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,9 +18,9 @@ classifiers = [
 ]
 
 dependencies = [
-  "crossplane-function-sdk-python==0.9.0",
+  "crossplane-function-sdk-python==0.10.0",
   "click==8.2.1",
-  "grpcio==1.74.0",
+  "grpcio==1.76.0",
 ]
 
 dynamic = ["version"]