diff --git a/package-lock.json b/package-lock.json
index 7024485..a87a853 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "protoc-gen-elm",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "protoc-gen-elm",
-      "version": "3.4.1",
+      "version": "3.4.2",
       "license": "BSD-3-Clause",
       "bin": {
         "protoc-gen-elm": "index.js"
diff --git a/package.json b/package.json
index d08ebe1..23eb279 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "protoc-gen-elm",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "description": "Elm protoc plugin",
   "keywords": [
     "elm",
diff --git a/src/Generator.elm b/src/Generator.elm
index 7bb0ddc..fd34ecf 100644
--- a/src/Generator.elm
+++ b/src/Generator.elm
@@ -50,7 +50,7 @@ requestToResponse versions options req =
 
         devToolsFiles =
             if options.grpcDevTools then
-                [ Generator.DevToolsWorker.devToolsJsFile versions ]
+                [ Generator.DevToolsWorker.devToolsJsFile versions, Generator.DevToolsWorker.devToolsDTsFile ]
 
             else
                 []
diff --git a/src/Generator/DevToolsWorker.elm b/src/Generator/DevToolsWorker.elm
index c9d1ecc..33a1f85 100644
--- a/src/Generator/DevToolsWorker.elm
+++ b/src/Generator/DevToolsWorker.elm
@@ -1,4 +1,4 @@
-module Generator.DevToolsWorker exposing (devToolsJsFile, generateDevToolsWorker)
+module Generator.DevToolsWorker exposing (devToolsJsFile, generateDevToolsWorker, devToolsDTsFile)
 
 import Elm.CodeGen as C
 import Generator.Common as Common
@@ -161,6 +161,11 @@ devToolsJsFile versions =
     { name = "Proto/dev-tools.mjs", content = devToolsJsFileContent versions, insertionPoint = "", generatedCodeInfo = Nothing }
 
 
+devToolsDTsFile : CodeGeneratorResponse.File
+devToolsDTsFile =
+    { name = "Proto/dev-tools.d.mts", content = "export {}", insertionPoint = "", generatedCodeInfo = Nothing }
+
+
 devToolsJsFileContent : AllVersions -> String
 devToolsJsFileContent versions =
     """/**