diff --git a/Cargo.lock b/Cargo.lock
index 625741f..46be537 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -462,9 +462,9 @@ dependencies = [
 
 [[package]]
 name = "evalexpr"
-version = "11.3.1"
+version = "13.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aff27af350e7b53e82aac3e5ab6389abd8f280640ac034508dff0608c4c7e5"
+checksum = "25929004897f2bbab309121a60400d36992f6d911d09baa6c172f6cc55706601"
 
 [[package]]
 name = "fallible-iterator"
diff --git a/Cargo.toml b/Cargo.toml
index 9483b1e..6915697 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -61,7 +61,7 @@ tower-http = { version = "0.6", features = ["cors"] }
 url = "2.5"
 
 # Math expression evaluation (for MCP servers)
-evalexpr = "11.3"
+evalexpr = "13.1"
 
 # Random number generation (for MCP servers)
 rand = "0.8"