diff --git a/Cargo.lock b/Cargo.lock
index 1c34e92..b52a0cc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -68,11 +68,11 @@ checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
 [[package]]
 name = "ammonia"
-version = "3.3.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64e6d1c7838db705c9b756557ee27c384ce695a1c51a6fe528784cb1c6840170"
+checksum = "1ab99eae5ee58501ab236beb6f20f6ca39be615267b014899c89b2f0bc18a459"
 dependencies = [
- "html5ever 0.26.0",
+ "html5ever 0.27.0",
  "maplit",
  "once_cell",
  "tendril",
diff --git a/server/Cargo.toml b/server/Cargo.toml
index dca0732..d00f107 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -7,7 +7,7 @@ default-run = "letterbox-server"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-ammonia = "3.3.0"
+ammonia = "4.0.0"
 anyhow = "1.0.79"
 async-graphql = { version = "7", features = ["log"] }
 async-graphql-rocket = "7"