diff --git a/doc/changelog.d/880.maintenance.md b/doc/changelog.d/880.maintenance.md
new file mode 100644
index 000000000..a69258568
--- /dev/null
+++ b/doc/changelog.d/880.maintenance.md
@@ -0,0 +1 @@
+Bump grpcio from 1.65.5 to 1.66.0 in the core group
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 71683cad6..a4134eeaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ tests = [
 doc = [
     "sphinx==8.0.2",
     "ansys-sphinx-theme[autoapi]==1.0.5",
-    "grpcio==1.65.5",
+    "grpcio==1.66.0",
     "imageio-ffmpeg==0.5.1",
     "imageio==2.35.1",
     "jupyter_sphinx==0.5.3",