diff --git a/mediapipe/framework/calculator.proto b/mediapipe/framework/calculator.proto
index eecd033c9..9984ee250 100644
--- a/mediapipe/framework/calculator.proto
+++ b/mediapipe/framework/calculator.proto
@@ -347,7 +347,8 @@ message CalculatorGraphConfig {
   // PacketGenerators can take as a input side packet the output side
   // packet of another PacketGenerator.  The graph of PacketGenerators
   // must be a directed acyclic graph.
-  repeated PacketGeneratorConfig packet_generator = 7;
+  // DEPRECATED: Use a Node to generate side packets.
+  repeated PacketGeneratorConfig packet_generator = 7 [deprecated = true];
   // Number of threads for running calculators in multithreaded mode.
   // If not specified, the scheduler will pick an appropriate number
   // of threads depending on the number of available processors.
diff --git a/mediapipe/framework/packet_generator.h b/mediapipe/framework/packet_generator.h
index dbc1f07e0..aaf6b20d0 100644
--- a/mediapipe/framework/packet_generator.h
+++ b/mediapipe/framework/packet_generator.h
@@ -18,6 +18,7 @@
 #include <string>
 #include <type_traits>
 
+#include "absl/base/attributes.h"
 #include "absl/base/macros.h"
 #include "absl/memory/memory.h"
 #include "mediapipe/framework/deps/registration.h"
diff --git a/mediapipe/framework/packet_generator.proto b/mediapipe/framework/packet_generator.proto
index 473908e05..ba269634d 100644
--- a/mediapipe/framework/packet_generator.proto
+++ b/mediapipe/framework/packet_generator.proto
@@ -17,6 +17,7 @@
 // ONLY used by mediapipe open source project.
 //
 // Messages for specifying PacketGenerators.
+// DEPRECATED: Use a Node to generate side packets.
 
 syntax = "proto2";
 
@@ -27,6 +28,8 @@ option java_outer_classname = "PacketGeneratorProto";
 
 // Options used by a PacketGenerator.
 message PacketGeneratorOptions {
+  option deprecated = true;
+
   // If true, this proto specifies a subset of field values,
   // which should override corresponding field values.
   optional bool merge_fields = 1 [default = true];
@@ -36,6 +39,8 @@ message PacketGeneratorOptions {
 
 // The settings specifying a packet generator and how it is connected.
 message PacketGeneratorConfig {
+  option deprecated = true;
+
   // The name of the registered packet generator class.
   optional string packet_generator = 1;
 
diff --git a/mediapipe/framework/packet_generator_graph.h b/mediapipe/framework/packet_generator_graph.h
index 99ea6557c..1d1afec4a 100644
--- a/mediapipe/framework/packet_generator_graph.h
+++ b/mediapipe/framework/packet_generator_graph.h
@@ -20,6 +20,7 @@
 #include <string>
 #include <vector>
 
+#include "absl/base/attributes.h"
 #include "absl/base/macros.h"
 #include "mediapipe/framework/executor.h"
 #include "mediapipe/framework/packet.h"