diff --git a/Gruntfile.js b/Gruntfile.js
index 2fb011d..eb5391d 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -38,14 +38,24 @@ module.exports = function(grunt) {
         'wiredep:app',
     ]);
 
+    grunt.registerTask('pydev', [
+        'newer:flake8'
+    ]);
+
     grunt.registerTask('jsdev', [
         'newer:jshint',
         'newer:jscs'
     ]);
 
+    grunt.registerTask('htmldev', [
+        'newer:htmllint'
+    ]);
+
     grunt.registerTask('dev', [
         'dependencies',
-        'jsdev'
+        'pydev',
+        'jsdev',
+        'htmldev'
     ]);
 
     grunt.registerTask('serve', [
diff --git a/grunt-config/flake8.js b/grunt-config/flake8.js
new file mode 100644
index 0000000..832647d
--- /dev/null
+++ b/grunt-config/flake8.js
@@ -0,0 +1,5 @@
+module.exports = {
+    src: [
+        'accountant/**/*.py'
+    ]
+}
diff --git a/grunt-config/htmllint.js b/grunt-config/htmllint.js
new file mode 100644
index 0000000..afd4c00
--- /dev/null
+++ b/grunt-config/htmllint.js
@@ -0,0 +1,9 @@
+module.exports = {
+    frontend: {
+      options: {},
+      src: [
+        'accountant/frontend/templates/**/*.html',
+        'accountant/frontend/static/templates/**/*.html'
+      ]
+    }
+}
diff --git a/grunt-config/watch.js b/grunt-config/watch.js
index 35208eb..6e9aef0 100644
--- a/grunt-config/watch.js
+++ b/grunt-config/watch.js
@@ -5,7 +5,18 @@ module.exports = {
     },
     js: {
         files: '<%= paths.frontend_js %>',
-        tasks: ['devjs']
+        tasks: ['jsdev']
+    },
+    py: {
+        files: 'accountant/**/*.py',
+        tasks: ['pydev']
+    },
+    html: {
+        files: [
+            'accountant/frontend/templates/**/*.html',
+            'accountant/frontend/static/templates/**/*.html'
+        ],
+        tasks: ['htmldev']
     },
     gruntfile: {
         files: ['Gruntfile.js']
diff --git a/package.json b/package.json
index 459e3a6..ea23514 100644
--- a/package.json
+++ b/package.json
@@ -4,20 +4,22 @@
   "repository": "https://git.lahouze.org/xals/accountant",
   "license": "AGPL-1.0",
   "devDependencies": {
-    "grunt": "0.4.5",
+    "grunt": "^0.4.5",
     "grunt-bg-shell": "^2.3.1",
-    "grunt-contrib-clean": "0.6.0",
-    "grunt-contrib-concat": "0.5.1",
-    "grunt-contrib-jshint": "0.11.2",
-    "grunt-contrib-watch": "0.6.1",
-    "grunt-copy": "0.1.0",
-    "grunt-jscs": "^2.6.0",
+    "grunt-contrib-clean": "^0.7.0",
+    "grunt-contrib-concat": "^0.5.1",
+    "grunt-contrib-jshint": "^0.12",
+    "grunt-contrib-watch": "^0.6.1",
+    "grunt-copy": "^0.1.0",
+    "grunt-flake8": "^0.1.3",
+    "grunt-htmllint": "^0.2.7",
+    "grunt-jscs": "^2.7.0",
     "grunt-newer": "^1.1.1",
-    "grunt-shell": "1.1.2",
+    "grunt-shell": "^1.1.2",
     "grunt-wiredep": "^2.0.0",
-    "jshint-stylish": "2.0.0",
-    "load-grunt-configs": "0.4.3",
-    "load-grunt-tasks": "3.2.0",
-    "time-grunt": "1.2.1"
+    "jshint-stylish": "^2.1.0",
+    "load-grunt-configs": "^0.4.3",
+    "load-grunt-tasks": "^3.2.0",
+    "time-grunt": "^1.3.0"
   }
 }