diff --git a/Cargo.lock b/Cargo.lock
index e599c92..2bda406 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -108,11 +108,11 @@ dependencies = [
 
 [[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",
+ "html5ever 0.27.0",
  "maplit",
  "once_cell",
  "tendril",
@@ -1961,12 +1961,26 @@ checksum = "bea68cab48b8459f17cf1c944c67ddc572d272d9f2b274140f223ecb1da4a3b7"
 dependencies = [
  "log",
  "mac",
- "markup5ever",
+ "markup5ever 0.11.0",
  "proc-macro2",
  "quote",
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "html5ever"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c13771afe0e6e846f1e67d038d4cb29998a6779f93c809212e4e9c32efd244d4"
+dependencies = [
+ "log",
+ "mac",
+ "markup5ever 0.12.1",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
 [[package]]
 name = "http"
 version = "0.2.8"
@@ -2354,7 +2368,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f29e4755b7b995046f510a7520c42b2fed58b77bd94d5a87a8eb43d2fd126da8"
 dependencies = [
  "cssparser",
- "html5ever",
+ "html5ever 0.26.0",
  "indexmap 1.9.2",
  "matches",
  "selectors",
@@ -2485,7 +2499,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c2a198fb6b0eada2a8df47933734e6d35d350665a33a3593d7164fa52c75c19"
 dependencies = [
  "cfg-if",
- "windows-targets 0.48.5",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -2589,6 +2603,20 @@ dependencies = [
  "tendril",
 ]
 
+[[package]]
+name = "markup5ever"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16ce3abbeba692c8b8441d036ef91aea6df8da2c6b6e21c7e14d3c18e526be45"
+dependencies = [
+ "log",
+ "phf 0.11.2",
+ "phf_codegen 0.11.2",
+ "string_cache",
+ "string_cache_codegen",
+ "tendril",
+]
+
 [[package]]
 name = "matchers"
 version = "0.1.0"
@@ -3092,6 +3120,16 @@ dependencies = [
  "phf_shared 0.10.0",
 ]
 
+[[package]]
+name = "phf_codegen"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8d39688d359e6b34654d328e262234662d16cc0f60ec8dcbe5e718709342a5a"
+dependencies = [
+ "phf_generator 0.11.2",
+ "phf_shared 0.11.2",
+]
+
 [[package]]
 name = "phf_generator"
 version = "0.8.0"
@@ -4736,7 +4774,7 @@ dependencies = [
  "dunce",
  "glob",
  "heck 0.5.0",
- "html5ever",
+ "html5ever 0.26.0",
  "infer",
  "json-patch",
  "kuchikiki",
@@ -6055,7 +6093,7 @@ dependencies = [
  "dunce",
  "gdkx11",
  "gtk",
- "html5ever",
+ "html5ever 0.26.0",
  "http 1.1.0",
  "javascriptcore-rs",
  "jni",
diff --git a/eml-client/src-tauri/Cargo.toml b/eml-client/src-tauri/Cargo.toml
index 1aa7620..2124d63 100644
--- a/eml-client/src-tauri/Cargo.toml
+++ b/eml-client/src-tauri/Cargo.toml
@@ -13,7 +13,7 @@ build = "src/build.rs"
 tauri-build = { version = "^2.0.0-beta.10", features = [] }
 
 [dependencies]
-ammonia = "^3.1.2"
+ammonia = "^4.0.0"
 anyhow = "^1.0"
 notmuch-more = "^0.0.0"
 serde_json = "^1.0"
diff --git a/notmuch-more/Cargo.toml b/notmuch-more/Cargo.toml
index 8ae2fdf..ecf3672 100644
--- a/notmuch-more/Cargo.toml
+++ b/notmuch-more/Cargo.toml
@@ -8,7 +8,7 @@ license-file = "../LICENCE"
 repository = "https://github.com/OJFord/amail"
 
 [dependencies]
-ammonia = "^3.1.2"
+ammonia = "^4.0.0"
 anyhow = "^1.0"
 base64 = "^0.22.0"
 chrono = "^0.4.35"