diff --git a/Cargo.lock b/Cargo.lock
index e1a1d60c2..e05c07f61 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -470,9 +470,9 @@ dependencies = [
 
 [[package]]
 name = "fiat-crypto"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a481586acf778f1b1455424c343f71124b048ffa5f4fc3f8f6ae9dc432dcb3c7"
+checksum = "53a56f0780318174bad1c127063fd0c5fdfb35398e3cd79ffaab931a6c79df80"
 
 [[package]]
 name = "fixed"
diff --git a/Cargo.toml b/Cargo.toml
index ccc732e7d..110755e50 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ ctr = { version = "0.9.2", optional = true }
 cmac = { version = "0.7.2", optional = true }
 base64 = "0.21.5"
 byteorder = "1.5.0"
-fiat-crypto = { version = "0.2.2", optional = true }
+fiat-crypto = { version = "0.2.4", optional = true }
 fixed = { version = "1.23", optional = true }
 getrandom = { version = "0.2.11", features = ["std"] }
 serde = { version = "1.0", features = ["derive"] }
diff --git a/supply-chain/audits.toml b/supply-chain/audits.toml
index a0dd3136c..17b438081 100644
--- a/supply-chain/audits.toml
+++ b/supply-chain/audits.toml
@@ -169,6 +169,11 @@ criteria = "safe-to-deploy"
 delta = "0.2.1 -> 0.2.2"
 notes = "No new usage of `unsafe` nor any functional changes I can detect."
 
+[[audits.fiat-crypto]]
+who = "Brandon Pitman <bran@bran.land>"
+criteria = "safe-to-deploy"
+delta = "0.2.2 -> 0.2.4"
+
 [[audits.fixed]]
 who = "David Cook <dcook@divviup.org>"
 criteria = "safe-to-deploy"