diff --git a/csharp/src/Apache.Arrow.Flight.Sql/Apache.Arrow.Flight.Sql.csproj b/csharp/src/Apache.Arrow.Flight.Sql/Apache.Arrow.Flight.Sql.csproj
index 1870888184906..ec438fde843f4 100644
--- a/csharp/src/Apache.Arrow.Flight.Sql/Apache.Arrow.Flight.Sql.csproj
+++ b/csharp/src/Apache.Arrow.Flight.Sql/Apache.Arrow.Flight.Sql.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Grpc.Tools" Version="2.65.0" PrivateAssets="All" />
+    <PackageReference Include="Grpc.Tools" Version="2.66.0" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj b/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
index 9e1866f84160b..afe7d39194211 100644
--- a/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
+++ b/csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj
@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.27.3" />
     <PackageReference Include="Grpc.Net.Client" Version="2.65.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.65.0" PrivateAssets="All" />
+    <PackageReference Include="Grpc.Tools" Version="2.66.0" PrivateAssets="All" />
     <PackageReference Include="System.Memory" Version="4.5.5" />
   </ItemGroup>