diff --git a/Cargo.lock b/Cargo.lock
index 55ec796..def74db 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -566,9 +566,9 @@ checksum = "383ad40bb927465ec0ce7720e033cb4ca06912855fc35db31b5755d0de75b1ee"
 
 [[package]]
 name = "unicode_names2"
-version = "3.1.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82c3e18d850bb6ebd57735e5654f0af65e572b05c2397e7b2b1a7c6a792cc29c"
+checksum = "8ba646312acace3c9ec35d7404b58214b6fbf17cbb0d040f35a88407c424447f"
 dependencies = [
  "phf",
  "unicode_names2_generator",
@@ -576,9 +576,9 @@ dependencies = [
 
 [[package]]
 name = "unicode_names2_generator"
-version = "3.1.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "849744a58c479122ff24910d7ca57f312b62613ef0412dc327776ae6b235d16a"
+checksum = "3afbb72a8cff40859641ae4e56679215a15764e5c155a46f0f534611bdc08e0e"
 dependencies = [
  "phf_codegen",
  "rand",
diff --git a/Cargo.toml b/Cargo.toml
index f3b275c..1873a0d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -51,7 +51,7 @@ unicode-script = "0.5"
 # A homoglyph finding shows a letter that looks exactly like the Latin one it
 # replaced, so printing the character is no help at all and "CYRILLIC SMALL
 # LETTER EN" is the whole answer.
-unicode_names2 = "3.1"
+unicode_names2 = "4.0"
 # The WHATWG encoding registry, which is what an `encoding` rule's label
 # resolves through: "Shift_JIS" here means what it means to every browser, and
 # a hand-enumerated subset of the registry would be the failure