diff --git a/Source/Google.Protobuf.Any.proto.swift b/Source/Google.Protobuf.Any.proto.swift
index 0e6b561..879ae21 100644
--- a/Source/Google.Protobuf.Any.proto.swift
+++ b/Source/Google.Protobuf.Any.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "any.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Api.proto.swift b/Source/Google.Protobuf.Api.proto.swift
index 17a92db..96fbbe6 100644
--- a/Source/Google.Protobuf.Api.proto.swift
+++ b/Source/Google.Protobuf.Api.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "api.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Descriptor.proto.swift b/Source/Google.Protobuf.Descriptor.proto.swift
index cb3371c..4d5ca63 100644
--- a/Source/Google.Protobuf.Descriptor.proto.swift
+++ b/Source/Google.Protobuf.Descriptor.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "descriptor.proto"
 /// Syntax "Proto2"
 
diff --git a/Source/Google.Protobuf.Duration.proto.swift b/Source/Google.Protobuf.Duration.proto.swift
index e8f91cc..fb9bb2f 100644
--- a/Source/Google.Protobuf.Duration.proto.swift
+++ b/Source/Google.Protobuf.Duration.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "duration.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Empty.proto.swift b/Source/Google.Protobuf.Empty.proto.swift
index a9cdc5d..c3928e7 100644
--- a/Source/Google.Protobuf.Empty.proto.swift
+++ b/Source/Google.Protobuf.Empty.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "empty.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.FieldMask.proto.swift b/Source/Google.Protobuf.FieldMask.proto.swift
index dd696eb..3805957 100644
--- a/Source/Google.Protobuf.FieldMask.proto.swift
+++ b/Source/Google.Protobuf.FieldMask.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "field_mask.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.SourceContext.proto.swift b/Source/Google.Protobuf.SourceContext.proto.swift
index d309d63..8f1d102 100644
--- a/Source/Google.Protobuf.SourceContext.proto.swift
+++ b/Source/Google.Protobuf.SourceContext.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "source_context.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Struct.proto.swift b/Source/Google.Protobuf.Struct.proto.swift
index 2f25498..383a793 100644
--- a/Source/Google.Protobuf.Struct.proto.swift
+++ b/Source/Google.Protobuf.Struct.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "struct.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.SwiftDescriptor.proto.swift b/Source/Google.Protobuf.SwiftDescriptor.proto.swift
index 3cecf3e..3390a1f 100644
--- a/Source/Google.Protobuf.SwiftDescriptor.proto.swift
+++ b/Source/Google.Protobuf.SwiftDescriptor.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "swift-descriptor.proto"
 /// Syntax "Proto2"
 
diff --git a/Source/Google.Protobuf.Timestamp.proto.swift b/Source/Google.Protobuf.Timestamp.proto.swift
index 9f9745b..3e23847 100644
--- a/Source/Google.Protobuf.Timestamp.proto.swift
+++ b/Source/Google.Protobuf.Timestamp.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "timestamp.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Type.proto.swift b/Source/Google.Protobuf.Type.proto.swift
index f5de5ca..a668db0 100644
--- a/Source/Google.Protobuf.Type.proto.swift
+++ b/Source/Google.Protobuf.Type.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "type.proto"
 /// Syntax "Proto3"
 
diff --git a/Source/Google.Protobuf.Wrappers.proto.swift b/Source/Google.Protobuf.Wrappers.proto.swift
index 8dd5b54..9d338d0 100644
--- a/Source/Google.Protobuf.Wrappers.proto.swift
+++ b/Source/Google.Protobuf.Wrappers.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "wrappers.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/Performance.proto.swift b/plugin/Tests/Performance.proto.swift
index c263621..97fe04c 100644
--- a/plugin/Tests/Performance.proto.swift
+++ b/plugin/Tests/Performance.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "performance.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Bar.Foo.proto.swift b/plugin/Tests/pbTests/Bar.Foo.proto.swift
index a5d0fd6..9487b94 100644
--- a/plugin/Tests/pbTests/Bar.Foo.proto.swift
+++ b/plugin/Tests/pbTests/Bar.Foo.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "foo.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Baz.Foo.proto.swift b/plugin/Tests/pbTests/Baz.Foo.proto.swift
index 3542374..8b66957 100644
--- a/plugin/Tests/pbTests/Baz.Foo.proto.swift
+++ b/plugin/Tests/pbTests/Baz.Foo.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "foo.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Google.Protobuf.NoGenericServicesTest.UnittestNoGenericServices.proto.swift b/plugin/Tests/pbTests/Google.Protobuf.NoGenericServicesTest.UnittestNoGenericServices.proto.swift
index 58d3a0e..d429332 100644
--- a/plugin/Tests/pbTests/Google.Protobuf.NoGenericServicesTest.UnittestNoGenericServices.proto.swift
+++ b/plugin/Tests/pbTests/Google.Protobuf.NoGenericServicesTest.UnittestNoGenericServices.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_no_generic_services.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Google.Protobuf.UnittestEnormousDescriptor.proto.swift b/plugin/Tests/pbTests/Google.Protobuf.UnittestEnormousDescriptor.proto.swift
index 2c5c6d8..0686424 100644
--- a/plugin/Tests/pbTests/Google.Protobuf.UnittestEnormousDescriptor.proto.swift
+++ b/plugin/Tests/pbTests/Google.Protobuf.UnittestEnormousDescriptor.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_enormous_descriptor.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestArena.proto.swift b/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestArena.proto.swift
index 7f5ae22..af317f7 100644
--- a/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestArena.proto.swift
+++ b/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestArena.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_arena.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestNoArenaImport.proto.swift b/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestNoArenaImport.proto.swift
index 8bb5b62..e5d789f 100644
--- a/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestNoArenaImport.proto.swift
+++ b/plugin/Tests/pbTests/Proto2ArenaUnittest.UnittestNoArenaImport.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_no_arena_import.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/Proto2NofieldpresenceUnittest.UnittestNoFieldPresence.proto.swift b/plugin/Tests/pbTests/Proto2NofieldpresenceUnittest.UnittestNoFieldPresence.proto.swift
index b06e34e..07d4e16 100644
--- a/plugin/Tests/pbTests/Proto2NofieldpresenceUnittest.UnittestNoFieldPresence.proto.swift
+++ b/plugin/Tests/pbTests/Proto2NofieldpresenceUnittest.UnittestNoFieldPresence.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_no_field_presence.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/pbTests/Proto3ArenaUnittest.UnittestProto3Arena.proto.swift b/plugin/Tests/pbTests/Proto3ArenaUnittest.UnittestProto3Arena.proto.swift
index 11cf8ca..ccacb20 100644
--- a/plugin/Tests/pbTests/Proto3ArenaUnittest.UnittestProto3Arena.proto.swift
+++ b/plugin/Tests/pbTests/Proto3ArenaUnittest.UnittestProto3Arena.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_proto3_arena.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/pbTests/Proto3PreserveUnknownEnumUnittest.UnittestPreserveUnknownEnum.proto.swift b/plugin/Tests/pbTests/Proto3PreserveUnknownEnumUnittest.UnittestPreserveUnknownEnum.proto.swift
index 71e7169..a011682 100644
--- a/plugin/Tests/pbTests/Proto3PreserveUnknownEnumUnittest.UnittestPreserveUnknownEnum.proto.swift
+++ b/plugin/Tests/pbTests/Proto3PreserveUnknownEnumUnittest.UnittestPreserveUnknownEnum.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_preserve_unknown_enum.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.Unittest.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.Unittest.proto.swift
index e7726d6..fc4cbad 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.Unittest.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.Unittest.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestCustomOptions.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestCustomOptions.proto.swift
index 4919ec1..01e4ea7 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestCustomOptions.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestCustomOptions.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_custom_options.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestEmbedOptimizeFor.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestEmbedOptimizeFor.proto.swift
index 8c260d7..982b295 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestEmbedOptimizeFor.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestEmbedOptimizeFor.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_embed_optimize_for.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestLite.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestLite.proto.swift
index 18d0fc0..6dc2fd7 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestLite.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestLite.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_lite.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestLiteImportsNonlite.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestLiteImportsNonlite.proto.swift
index bf06121..0ae6168 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestLiteImportsNonlite.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestLiteImportsNonlite.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_lite_imports_nonlite.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestMset.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestMset.proto.swift
index 388dfc5..afb0009 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestMset.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestMset.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_mset.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestOptimizeFor.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestOptimizeFor.proto.swift
index 1aa9b1a..ffe2a40 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestOptimizeFor.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestOptimizeFor.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_optimize_for.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittest.UnittestWellKnownTypes.proto.swift b/plugin/Tests/pbTests/ProtobufUnittest.UnittestWellKnownTypes.proto.swift
index 30a0e42..90ba226 100644
--- a/plugin/Tests/pbTests/ProtobufUnittest.UnittestWellKnownTypes.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittest.UnittestWellKnownTypes.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_well_known_types.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImport.proto.swift b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImport.proto.swift
index b45b5f8..009d471 100644
--- a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImport.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImport.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_import.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportLite.proto.swift b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportLite.proto.swift
index f20b1a2..0611b51 100644
--- a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportLite.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportLite.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_import_lite.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublic.proto.swift b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublic.proto.swift
index d116b14..1bb5c6a 100644
--- a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublic.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublic.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_import_public.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublicLite.proto.swift b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublicLite.proto.swift
index 4842e10..4766e91 100644
--- a/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublicLite.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittestImport.UnittestImportPublicLite.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_import_public_lite.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/ProtobufUnittestNoArena.UnittestNoArena.proto.swift b/plugin/Tests/pbTests/ProtobufUnittestNoArena.UnittestNoArena.proto.swift
index b2e09c2..e34592d 100644
--- a/plugin/Tests/pbTests/ProtobufUnittestNoArena.UnittestNoArena.proto.swift
+++ b/plugin/Tests/pbTests/ProtobufUnittestNoArena.UnittestNoArena.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_no_arena.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/SwiftProtobufUnittest.UnittestMaps.proto.swift b/plugin/Tests/pbTests/SwiftProtobufUnittest.UnittestMaps.proto.swift
index 3514b93..dfc39b1 100644
--- a/plugin/Tests/pbTests/SwiftProtobufUnittest.UnittestMaps.proto.swift
+++ b/plugin/Tests/pbTests/SwiftProtobufUnittest.UnittestMaps.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_maps.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/UnittestDropUnknownFields.UnittestDropUnknownFields.proto.swift b/plugin/Tests/pbTests/UnittestDropUnknownFields.UnittestDropUnknownFields.proto.swift
index 2b33d5d..ade88f3 100644
--- a/plugin/Tests/pbTests/UnittestDropUnknownFields.UnittestDropUnknownFields.proto.swift
+++ b/plugin/Tests/pbTests/UnittestDropUnknownFields.UnittestDropUnknownFields.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_drop_unknown_fields.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/Tests/pbTests/UnittestEmpty.proto.swift b/plugin/Tests/pbTests/UnittestEmpty.proto.swift
index 22f3f1d..de216b7 100644
--- a/plugin/Tests/pbTests/UnittestEmpty.proto.swift
+++ b/plugin/Tests/pbTests/UnittestEmpty.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_empty.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/UnittestErrorType.proto.swift b/plugin/Tests/pbTests/UnittestErrorType.proto.swift
index eef85aa..9053ab8 100644
--- a/plugin/Tests/pbTests/UnittestErrorType.proto.swift
+++ b/plugin/Tests/pbTests/UnittestErrorType.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_error_type.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/UnittestStruct.proto.swift b/plugin/Tests/pbTests/UnittestStruct.proto.swift
index aca27a0..579bddd 100644
--- a/plugin/Tests/pbTests/UnittestStruct.proto.swift
+++ b/plugin/Tests/pbTests/UnittestStruct.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_struct.proto"
 /// Syntax "Proto2"
 
diff --git a/plugin/Tests/pbTests/UnittestThreading.proto.swift b/plugin/Tests/pbTests/UnittestThreading.proto.swift
index 5c8092b..955594a 100644
--- a/plugin/Tests/pbTests/UnittestThreading.proto.swift
+++ b/plugin/Tests/pbTests/UnittestThreading.proto.swift
@@ -1,5 +1,5 @@
 /// Generated by the Protocol Buffers 3.4.0 compiler.  DO NOT EDIT!
-/// Protobuf-swift version: 3.0.24
+/// Protobuf-swift version: 4.0.0
 /// Source file "unittest_threading.proto"
 /// Syntax "Proto3"
 
diff --git a/plugin/compiler/react_native/swift_helpers_react.h b/plugin/compiler/react_native/swift_helpers_react.h
index 94b4fe8..f109a1b 100644
--- a/plugin/compiler/react_native/swift_helpers_react.h
+++ b/plugin/compiler/react_native/swift_helpers_react.h
@@ -23,7 +23,7 @@
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 
-#define SWIFT_PROTOBUF_VERSION "3.0.24"
+#define SWIFT_PROTOBUF_VERSION "4.0.0"
 
 namespace google {
     namespace protobuf {
diff --git a/plugin/compiler/swift_helpers.h b/plugin/compiler/swift_helpers.h
index f564953..8c489b6 100644
--- a/plugin/compiler/swift_helpers.h
+++ b/plugin/compiler/swift_helpers.h
@@ -23,7 +23,7 @@
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 
-#define SWIFT_PROTOBUF_VERSION "3.0.24"
+#define SWIFT_PROTOBUF_VERSION "4.0.0"
 
 namespace google {
     namespace protobuf {