diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index a98dc6f..c214bbe 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -23,3 +23,5 @@ targets, and reject invalid `start_time` values passed to `DispatchApiClient.cre
 ## Bug Fixes
 
 - `DispatchApiClient.create()`: Passing an invalid `start_time` (not a `datetime` or `"NOW"`) previously silently created a dispatch with an epoch timestamp (1970-01-01). It now raises `ValueError` immediately.
+- Require `frequenz-client-base` 0.11.3 or newer so HTTP/2 keepalive settings are
+  applied correctly.
diff --git a/pyproject.toml b/pyproject.toml
index 4519cf8..a7ea1b1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ requires-python = ">= 3.11, < 4"
 dependencies = [
   "typing-extensions >= 4.13.0, < 5",
   "frequenz-api-dispatch >= 1.0.0, < 2",
-  "frequenz-client-base >= 0.11.0, < 0.12.0",
+  "frequenz-client-base >= 0.11.3, < 0.12.0",
   "frequenz-client-common >= 0.3.8, < 0.4.0",
   "frequenz-core >= 1.0.2, < 2.0.0",
   "grpcio >= 1.80.0, < 2",