diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9030958..a8d8925 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Security
+- Upgraded `python-jose[cryptography]` from `3.3.0` to `3.4.0` to fix an algorithm-confusion vulnerability with OpenSSH ECDSA keys (CVE affects all versions < 3.4.0).
+
 ### Added
 - **Gmail Debug Email**: New "Send Debug Email" button in the Gmail API settings section. When clicked, it injects a test email into the user's Gmail inbox via the Gmail API. The message appears to be from `christian@docuelevate.org`, includes the current date in the subject line, and is automatically labelled with `test` and `imported` (labels are created on first use) and placed in the inbox. Useful for verifying end-to-end Gmail API delivery without requiring a full mail-account polling cycle.
 - `GmailService.get_or_create_label()` async method: lists the user's Gmail labels and returns the matching label ID, creating the label if it does not yet exist.
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 3510b4d..0707b88 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -11,7 +11,7 @@ psycopg2-binary==2.9.11
 asyncpg==0.31.0
 
 # Authentication
-python-jose[cryptography]==3.3.0
+python-jose[cryptography]==3.4.0
 bcrypt==4.3.0
 python-multipart==0.0.22  # Updated: Fixed multiple vulnerabilities (was 0.0.6)
 authlib==1.6.9  # Updated: Fixed OIDC hash binding, JWE RSA1_5 padding oracle, alg:none bypass, JWK header injection (was 1.6.6)