diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 038f2109c..448d331b2 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0, 3, 16, 'final', 0
+current_version = 0, 4, 0, 'alpha', 0
 commit = False
 tag = False
 parse = (?P<major>\d+)\,\ (?P<minor>\d+)\,\ (?P<patch>\d+)\,\ \'(?P<release>\S+)\'\,\ (?P<build>\d+)
diff --git a/app/package.json b/app/package.json
index 0b61be8ca..6b71f7034 100644
--- a/app/package.json
+++ b/app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/app",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "private": true,
   "scripts": {
     "build": "webpack",
@@ -78,16 +78,16 @@
     "@lumino/signaling": "~1.10.1",
     "@lumino/virtualdom": "~1.14.1",
     "@lumino/widgets": "~1.30.1",
-    "@retrolab/application": "~0.3.16",
-    "@retrolab/application-extension": "~0.3.16",
-    "@retrolab/console-extension": "~0.3.16",
-    "@retrolab/docmanager-extension": "~0.3.16",
-    "@retrolab/documentsearch-extension": "~0.3.16",
-    "@retrolab/help-extension": "~0.3.16",
-    "@retrolab/notebook-extension": "~0.3.16",
-    "@retrolab/terminal-extension": "~0.3.16",
-    "@retrolab/tree-extension": "~0.3.16",
-    "@retrolab/ui-components": "~0.3.16",
+    "@retrolab/application": "~0.4.0-alpha.0",
+    "@retrolab/application-extension": "~0.4.0-alpha.0",
+    "@retrolab/console-extension": "~0.4.0-alpha.0",
+    "@retrolab/docmanager-extension": "~0.4.0-alpha.0",
+    "@retrolab/documentsearch-extension": "~0.4.0-alpha.0",
+    "@retrolab/help-extension": "~0.4.0-alpha.0",
+    "@retrolab/notebook-extension": "~0.4.0-alpha.0",
+    "@retrolab/terminal-extension": "~0.4.0-alpha.0",
+    "@retrolab/tree-extension": "~0.4.0-alpha.0",
+    "@retrolab/ui-components": "~0.4.0-alpha.0",
     "react": "~17.0.2",
     "react-dom": "~17.0.2",
     "yjs": "~13.5.23"
@@ -122,16 +122,16 @@
     "@jupyterlab/translation-extension": "^4.0.0-alpha.4",
     "@jupyterlab/user-extension": "^4.0.0-alpha.4",
     "@jupyterlab/vega5-extension": "^4.0.0-alpha.4",
-    "@retrolab/application": "^0.3.15",
-    "@retrolab/application-extension": "^0.3.15",
-    "@retrolab/console-extension": "^0.3.15",
-    "@retrolab/docmanager-extension": "^0.3.15",
-    "@retrolab/documentsearch-extension": "^0.3.15",
-    "@retrolab/help-extension": "^0.3.15",
-    "@retrolab/notebook-extension": "^0.3.15",
-    "@retrolab/terminal-extension": "^0.3.15",
-    "@retrolab/tree-extension": "^0.3.15",
-    "@retrolab/ui-components": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0",
+    "@retrolab/application-extension": "^0.4.0-alpha.0",
+    "@retrolab/console-extension": "^0.4.0-alpha.0",
+    "@retrolab/docmanager-extension": "^0.4.0-alpha.0",
+    "@retrolab/documentsearch-extension": "^0.4.0-alpha.0",
+    "@retrolab/help-extension": "^0.4.0-alpha.0",
+    "@retrolab/notebook-extension": "^0.4.0-alpha.0",
+    "@retrolab/terminal-extension": "^0.4.0-alpha.0",
+    "@retrolab/tree-extension": "^0.4.0-alpha.0",
+    "@retrolab/ui-components": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "@jupyterlab/builder": "^4.0.0-alpha.4",
diff --git a/buildutils/package.json b/buildutils/package.json
index d035891c6..ca12bb779 100644
--- a/buildutils/package.json
+++ b/buildutils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/buildutils",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "private": true,
   "description": "RetroLab - Build Utilities",
   "homepage": "https://github.com/jupyterlab/retrolab",
diff --git a/packages/_metapackage/package.json b/packages/_metapackage/package.json
index b366dba4a..fd83074b7 100644
--- a/packages/_metapackage/package.json
+++ b/packages/_metapackage/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@retrolab/metapackage",
   "private": true,
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Metapackage",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/packages/application-extension/package.json b/packages/application-extension/package.json
index a173ef79a..7684cbd50 100644
--- a/packages/application-extension/package.json
+++ b/packages/application-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/application-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Application Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -54,8 +54,8 @@
     "@lumino/coreutils": "^1.11.1",
     "@lumino/disposable": "^1.10.1",
     "@lumino/widgets": "^1.30.1",
-    "@retrolab/application": "^0.3.15",
-    "@retrolab/ui-components": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0",
+    "@retrolab/ui-components": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/packages/application/package.json b/packages/application/package.json
index 5320e4afc..6578f2208 100644
--- a/packages/application/package.json
+++ b/packages/application/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/application",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Application",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/packages/console-extension/package.json b/packages/console-extension/package.json
index 44dd4ccf5..8d1e5b3df 100644
--- a/packages/console-extension/package.json
+++ b/packages/console-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/console-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Console Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/packages/docmanager-extension/package.json b/packages/docmanager-extension/package.json
index e0bf070df..b748bef95 100644
--- a/packages/docmanager-extension/package.json
+++ b/packages/docmanager-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/docmanager-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Document Manager Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/packages/documentsearch-extension/package.json b/packages/documentsearch-extension/package.json
index af04ec590..4a28f3cd8 100644
--- a/packages/documentsearch-extension/package.json
+++ b/packages/documentsearch-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/documentsearch-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Document Search Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -42,7 +42,7 @@
     "@jupyterlab/application": "^4.0.0-alpha.4",
     "@jupyterlab/documentsearch": "^4.0.0-alpha.4",
     "@lumino/widgets": "^1.30.1",
-    "@retrolab/application": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/packages/help-extension/package.json b/packages/help-extension/package.json
index f4efa3c44..91399fe6c 100644
--- a/packages/help-extension/package.json
+++ b/packages/help-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/help-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Help Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -43,7 +43,7 @@
     "@jupyterlab/apputils": "^4.0.0-alpha.4",
     "@jupyterlab/mainmenu": "^4.0.0-alpha.4",
     "@jupyterlab/translation": "^4.0.0-alpha.4",
-    "@retrolab/ui-components": "^0.3.15"
+    "@retrolab/ui-components": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/packages/lab-extension/package.json b/packages/lab-extension/package.json
index 875a54bd7..55293987a 100644
--- a/packages/lab-extension/package.json
+++ b/packages/lab-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/lab-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Lab Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -52,7 +52,7 @@
     "@jupyterlab/translation": "^4.0.0-alpha.4",
     "@lumino/commands": "^1.19.1",
     "@lumino/disposable": "^1.10.1",
-    "@retrolab/application": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "@jupyterlab/builder": "^4.0.0-alpha.4",
diff --git a/packages/notebook-extension/package.json b/packages/notebook-extension/package.json
index 726144c8c..72b335ac9 100644
--- a/packages/notebook-extension/package.json
+++ b/packages/notebook-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/notebook-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Notebook Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -48,7 +48,7 @@
     "@jupyterlab/translation": "^4.0.0-alpha.4",
     "@lumino/polling": "^1.9.1",
     "@lumino/widgets": "^1.30.1",
-    "@retrolab/application": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/packages/terminal-extension/package.json b/packages/terminal-extension/package.json
index e64c55bdf..88f110a12 100644
--- a/packages/terminal-extension/package.json
+++ b/packages/terminal-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/terminal-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Terminal Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/packages/tree-extension/package.json b/packages/tree-extension/package.json
index 1667cab36..057eada53 100644
--- a/packages/tree-extension/package.json
+++ b/packages/tree-extension/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/tree-extension",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - Tree Extension",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
@@ -53,7 +53,7 @@
     "@lumino/algorithm": "^1.9.1",
     "@lumino/commands": "^1.19.1",
     "@lumino/widgets": "^1.30.1",
-    "@retrolab/application": "^0.3.15"
+    "@retrolab/application": "^0.4.0-alpha.0"
   },
   "devDependencies": {
     "rimraf": "~3.0.0",
diff --git a/packages/ui-components/package.json b/packages/ui-components/package.json
index 95df1f6cf..330ddbbfb 100644
--- a/packages/ui-components/package.json
+++ b/packages/ui-components/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@retrolab/ui-components",
-  "version": "0.3.16",
+  "version": "0.4.0-alpha.0",
   "description": "RetroLab - UI components",
   "homepage": "https://github.com/jupyterlab/retrolab",
   "bugs": {
diff --git a/retrolab/_version.py b/retrolab/_version.py
index 743e36d4e..e8c1eea29 100644
--- a/retrolab/_version.py
+++ b/retrolab/_version.py
@@ -12,7 +12,7 @@ VersionInfo = namedtuple('VersionInfo', [
 ])
 
 # DO NOT EDIT THIS DIRECTLY!  It is managed by bumpversion
-version_info = VersionInfo(0, 3, 16, 'final', 0)
+version_info = VersionInfo(0, 4, 0, 'alpha', 0)
 
 _specifier_ = {'alpha': 'a', 'beta': 'b', 'candidate': 'rc', 'final': ''}