diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 4b0202fb..f78577a9 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 5.1.4beta0
+current_version = 5.2.0beta0
 commit = True
 message = Bump version: {current_version} → {new_version}
 tag = False
diff --git a/docs/conf.py b/docs/conf.py
index 0fe4c806..1c0f2464 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -64,7 +64,7 @@
 # built documents.
 #
 # The short X.Y version.
-version = '5.1'
+version = '5.2'
 # The full version, including alpha/beta/rc tags.
 release = version
 
diff --git a/nbformat/_version.py b/nbformat/_version.py
index 15cbba50..a97d7968 100644
--- a/nbformat/_version.py
+++ b/nbformat/_version.py
@@ -1,3 +1,3 @@
 # Make sure to update package.json, too!
-version_info = (5, 1, 4, 'beta0')
+version_info = (5, 2, 0, 'beta0')
 __version__ = '.'.join(map(str, version_info))
diff --git a/package.json b/package.json
index 31d6044d..99d3e630 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nbformat-schema",
-  "version": "5.1.4-beta.0",
+  "version": "5.2.0-beta.0",
   "description": "JSON schemata for Jupyter notebook formats",
   "main": "index.js",
   "files": [