diff --git a/ansys/api/edb/VERSION b/ansys/api/edb/VERSION
index 7009fc5..edb4e39 100644
--- a/ansys/api/edb/VERSION
+++ b/ansys/api/edb/VERSION
@@ -1 +1 @@
-0.3.dev2
\ No newline at end of file
+0.3.dev3
diff --git a/ansys/api/edb/v1/cell.proto b/ansys/api/edb/v1/cell.proto
index 3e19509..11e07fc 100644
--- a/ansys/api/edb/v1/cell.proto
+++ b/ansys/api/edb/v1/cell.proto
@@ -181,6 +181,11 @@ service CellService {
   // io_flags:
   //   - cache
   rpc GenerateViaSmartBox (StringPropertyMessage) returns (PolygonDataListMessage) {}
+
+  // summary: Apply technology
+  // io_flags:
+  //   - buffer
+  rpc ApplyTechnology (CellApplyTechnologyMessage) returns (google.protobuf.Empty) {}
 }
 
 message CellCreationMessage {
@@ -220,3 +225,8 @@ message CellSetTouchstoneExportSettingsMessage {
   EDBObjMessage cell = 1;
   TouchstoneExportSettingsMessage ts_settings = 2;
 }
+
+message CellApplyTechnologyMessage {
+  EDBObjMessage cell = 1;
+  string definition_name = 2;
+}
diff --git a/ansys/api/edb/v1/definition_obj.proto b/ansys/api/edb/v1/definition_obj.proto
index 6427546..a0408f3 100644
--- a/ansys/api/edb/v1/definition_obj.proto
+++ b/ansys/api/edb/v1/definition_obj.proto
@@ -13,6 +13,7 @@ enum DefinitionObjType {
   MATERIAL_DEF = 3;
   DATASET_DEF = 4;
   PACKAGE_DEF = 5;
-  DEFINITION_TYPE_COUNT = 6;
+  TECHNOLOGY_DEF = 6;
+  DEFINITION_TYPE_COUNT = 7;
   INVALID_DEFINITION_TYPE = -1;
 }
\ No newline at end of file
diff --git a/ansys/api/edb/v1/technology_def.proto b/ansys/api/edb/v1/technology_def.proto
new file mode 100644
index 0000000..41b0542
--- /dev/null
+++ b/ansys/api/edb/v1/technology_def.proto
@@ -0,0 +1,62 @@
+// Proto file representing the technology definition class
+
+syntax = "proto3";
+
+// Package
+package ansys.api.edb.v1;
+
+// Imports
+import "ansys/api/edb/v1/edb_messages.proto";
+
+// Technology Definition Service
+service TechnologyDefService {
+  // summary: Create a technology def in the given database
+  // io_flags:
+  //   - buffer
+  //   - returns_future
+  rpc Create(TechnologyDefCreateMessage) returns (EDBObjMessage) {}
+
+  // summary: Find a technology def in the given database
+  // io_flags:
+  //   - cache
+  rpc FindByName(EDBObjNameMessage) returns (EDBObjMessage) {}
+
+  // summary: Delete a technology definition
+  // io_flags:
+  //   - buffer
+  rpc Delete(EDBObjMessage) returns (google.protobuf.Empty) {}
+
+  // summary: Get the technology file
+  // io_flags:
+  //   - cache
+  rpc GetTechFile(EDBObjMessage) returns (google.protobuf.StringValue) {}
+
+  // summary: Get the GFD file
+  // io_flags:
+  //   - cache
+  rpc GetGFDFile(EDBObjMessage) returns (google.protobuf.StringValue) {}
+
+  // summary: Get the layer filter file
+  // io_flags:
+  //   - cache
+  rpc GetLayerFile(EDBObjMessage) returns (google.protobuf.StringValue) {}
+
+  // summary: Get the definition name of the technology
+  // io_flags:
+  //   - cache
+  rpc GetName(EDBObjMessage) returns (google.protobuf.StringValue) {}
+
+  // summary: Get whether the technology definition creates a backplane
+  // io_flags:
+  //   - cache
+  rpc GetIsCreateBackplane(EDBObjMessage) returns (google.protobuf.BoolValue) {}
+}
+
+message TechnologyDefCreateMessage {
+  EDBObjMessage database = 1;
+  string definition_name = 2;
+  string vlc_tech_file = 3;
+  string gfd_file = 4;
+  string layer_filter_file = 5;
+  bool create_backplane = 6;
+}