diff --git a/CHANGELOG b/CHANGELOG.txt
similarity index 72%
rename from CHANGELOG
rename to CHANGELOG.txt
index 79ac0e6..5b6c90a 100644
--- a/CHANGELOG
+++ b/CHANGELOG.txt
@@ -1,7 +1,12 @@
+4.0.0
+-----
+
+* Update for Gleam 0.28.
+
 3.1.0
 -----
 
-* Add "HTMLBody" encoding mode that doesn't encode everything.
++ Add "HTMLBody" encoding mode that doesn't encode everything.
 
 3.0.0
 -----
diff --git a/gleam.toml b/gleam.toml
index 0c23e68..685f36f 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -1,5 +1,5 @@
 name = "glentities"
-version = "3.1.0"
+version = "4.0.0"
 description = "HTML entity encoder/decoder for Gleam"
 
 # Fill out these fields if you intend to generate HTML documentation or publish
@@ -12,7 +12,7 @@ links = []
 internal_modules = ["glentities/internal/*"]
 
 [dependencies]
-gleam_stdlib = "~> 0.28.0"
+gleam_stdlib = "~> 0.29.0"
 
 [dev-dependencies]
 gleeunit = "~> 0.10"
diff --git a/manifest.toml b/manifest.toml
index a5115b3..62c5ca0 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -2,10 +2,10 @@
 # You typically do not need to edit this file
 
 packages = [
-  { name = "gleam_stdlib", version = "0.28.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "73F0A89FADE5022CBEF6D6C3551F9ADCE7054AFCE0CB1DC4C6D5AB4CA62D0111" },
+  { name = "gleam_stdlib", version = "0.29.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "24581B17879AA903B3E7531869D9460730C2F772A1C02C774ABF75710CCC4CFE" },
   { name = "gleeunit", version = "0.10.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "ECEA2DE4BE6528D36AFE74F42A21CDF99966EC36D7F25DEB34D47DD0F7977BAF" },
 ]
 
 [requirements]
-gleam_stdlib = "~> 0.28.0"
+gleam_stdlib = "~> 0.29.0"
 gleeunit = "~> 0.10"