diff --git a/newsfragments/73.internal.rst b/newsfragments/73.internal.rst
new file mode 100644
index 0000000..8f71206
--- /dev/null
+++ b/newsfragments/73.internal.rst
@@ -0,0 +1 @@
+Add ``version.json`` for consistency with go-cid and the multiformats ecosystem; bump-my-version keeps it in sync on release.
diff --git a/pyproject.toml b/pyproject.toml
index c503b93..7c7573a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -272,3 +272,8 @@ replace = 'version = "{new_version}"'
 filename = "cid/__init__.py"
 search = '__version__ = "{current_version}"'
 replace = '__version__ = "{new_version}"'
+
+[[tool.bumpversion.files]]
+filename = "version.json"
+search = "\"version\": \"v{current_version}\""
+replace = "\"version\": \"v{new_version}\""
diff --git a/version.json b/version.json
new file mode 100644
index 0000000..fc15ae0
--- /dev/null
+++ b/version.json
@@ -0,0 +1,3 @@
+{
+  "version": "v0.5.0"
+}