diff --git a/README.md b/README.md
index e465b25..a845875 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ git clone https://github.com/StyleRef/styleref-comfyui
 ```
 
 Restart ComfyUI. No dependencies to install — the pack uses only the Python
-standard library. Look for `[StyleRef] v0.1.0 — 5 nodes registered` in the
+standard library. Look for `[StyleRef] v1.0.0 — 5 nodes registered` in the
 server console at startup.
 
 ## 60-second quickstart
diff --git a/__init__.py b/__init__.py
index b0da6e7..d305b96 100644
--- a/__init__.py
+++ b/__init__.py
@@ -46,7 +46,7 @@ NODE_DISPLAY_NAME_MAPPINGS = {
 # progressive enhancement. Nothing here is required for the nodes to work.
 WEB_DIRECTORY = "./web"
 
-_FALLBACK_VERSION = "0.1.0"
+_FALLBACK_VERSION = "1.0.0"
 
 
 def _pack_version() -> str:
diff --git a/pyproject.toml b/pyproject.toml
index ded131d..74fb0c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "styleref-comfyui"
-version = "0.1.0"
+version = "1.0.0"
 description = "Load StyleRef creative styles as ComfyUI nodes — define a style once, reuse it across FLUX, SDXL, and SD1.5."
 authors = [{ name = "StyleRef", email = "hello@styleref.io" }]
 readme = "README.md"
diff --git a/styleref_api.py b/styleref_api.py
index a56c04f..07cb606 100644
--- a/styleref_api.py
+++ b/styleref_api.py
@@ -25,7 +25,7 @@ SITE_URL = "https://styleref.io"
 
 # Identifies this surface in StyleRef's API telemetry (recordApiCall reads it).
 CLIENT_TAG = "comfyui"
-USER_AGENT = "styleref-comfyui/0.1.0 (+https://styleref.io)"
+USER_AGENT = "styleref-comfyui/1.0.0 (+https://styleref.io)"
 
 DEFAULT_TIMEOUT_S = 30
 
diff --git a/tests/test_api.py b/tests/test_api.py
index 01c5635..847af3f 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -2,8 +2,11 @@
 
 from __future__ import annotations
 
+import importlib
 import io
 import json
+import os
+import re
 import urllib.error
 
 import pytest
@@ -359,3 +362,26 @@ def test_get_style_spec_returns_etag_on_200(monkeypatch):
     spec, _url, etag = api.get_style_spec("abc")
     assert spec["name"] == "Warm"
     assert etag == 'W/"e2"'
+
+
+# ── version strings stay in sync ─────────────────────────────────────────────
+
+
+def test_version_strings_agree_with_pyproject():
+    """
+    The version lives in three places: pyproject (which the Registry publishes
+    and the release workflow checks the tag against), the User-Agent this client
+    sends, and __init__'s fallback for when pyproject cannot be read. Only the
+    first is enforced by anything, so the other two drift silently and the
+    telemetry then attributes traffic to a version nobody is running.
+    """
+    root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    with open(os.path.join(root, "pyproject.toml"), encoding="utf-8") as fh:
+        declared = re.search(r'^version\s*=\s*"([^"]+)"', fh.read(), re.MULTILINE).group(1)
+
+    assert f"styleref-comfyui/{declared} " in api.USER_AGENT, (
+        f"USER_AGENT is {api.USER_AGENT!r}, pyproject says {declared}"
+    )
+
+    pack = importlib.import_module("__init__")
+    assert declared == pack._FALLBACK_VERSION