diff --git a/requirements.txt b/requirements.txt
index a6788f2..5518567 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-fastmcp>=3.4.2
+fastmcp>=3.4.3
 httpx>=0.28.1
 Pillow>=12.2.0
 # SSRF hardening for outbound Substack API fetch (MYC-101).