diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1a5e27..a7dab6d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [1.2.1] - 2026-02-25
+
+- Fix SDK version header: use correct header name `X-Reforge-SDK-Version` and value format `sdk-python-{version}` to match all other SDKs [#25]
+
 ## [1.2.0] - 2026-01-22
 
 - Add SSE watchdog to detect stuck connections and trigger recovery via polling fallback [#20]
diff --git a/pyproject.toml b/pyproject.toml
index a293bed..e3f175c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "sdk-reforge"
-version = "1.2.0"
+version = "1.2.1"
 description = "Python sdk for Reforge Feature Flags and Config as a Service: https://www.reforge.com"
 license = "MIT"
 authors = ["Michael Berkowitz <michael.berkowitz@gmail.com>", "James Kebinger <james.kebinger@reforge.com>"]
diff --git a/sdk_reforge/VERSION b/sdk_reforge/VERSION
index 26aaba0..6085e94 100644
--- a/sdk_reforge/VERSION
+++ b/sdk_reforge/VERSION
@@ -1 +1 @@
-1.2.0
+1.2.1
diff --git a/sdk_reforge/_requests.py b/sdk_reforge/_requests.py
index b2a2de5..1f791b6 100644
--- a/sdk_reforge/_requests.py
+++ b/sdk_reforge/_requests.py
@@ -131,9 +131,7 @@ def __init__(self, options):
         self.session.mount("https://", requests.adapters.HTTPAdapter())
         self.session.mount("http://", requests.adapters.HTTPAdapter())
         self.session.headers.update(
-            {
-                "X-Reforge-Client-Version": f"reforge-python-{getattr(options, 'version', 'development')}"
-            }
+            {VersionHeader: f"sdk-python-{getattr(options, 'version', 'development')}"}
         )
         # Initialize a cache (here with a maximum of 2 entries).
         self.cache = LRUCache(max_size=2)