diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a6e7958..f417b1c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -3,7 +3,6 @@ name: test
 on:
   push:
     branches:
-      - master
       - main
   pull_request:
 
@@ -14,10 +13,9 @@ jobs:
       - uses: actions/checkout@v3
       - uses: erlef/setup-beam@v1
         with:
-          otp-version: "25.2"
-          gleam-version: "1.2.0"
+          otp-version: "27"
+          gleam-version: "1.9.0"
           rebar3-version: "3"
           # elixir-version: "1.14.2"
-      - run: gleam format --check src test
-      - run: gleam deps download
       - run: gleam test
+      - run: gleam format --check src test
diff --git a/gleam.toml b/gleam.toml
index ef04243..bcec7a7 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -4,15 +4,15 @@ description = "Basic file operations that work on all targets"
 
 licences = ["Apache-2.0"]
 repository = { type = "github", user = "bcpeinhardt", repo = "simplifile" }
-gleam = ">= 0.32.0"
+gleam = ">= 1.9.0"
 # links = [{ title = "Website", href = "https://gleam.run" }]
 
 [javascript.deno]
 allow_all = true
 
 [dependencies]
-gleam_stdlib = "~> 0.34 or ~> 1.0"
-filepath = "~> 1.0"
+gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+filepath = ">= 1.0.0 and < 2.0.0"
 
 [dev-dependencies]
-gleeunit = "~> 1.0"
+gleeunit = ">= 1.0.0 and < 2.0.0"
diff --git a/manifest.toml b/manifest.toml
index e9adc58..cc72bab 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -2,12 +2,12 @@
 # You typically do not need to edit this file
 
 packages = [
-  { name = "filepath", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "EFB6FF65C98B2A16378ABC3EE2B14124168C0CE5201553DE652E2644DCFDB594" },
-  { name = "gleam_stdlib", version = "0.34.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "1FB8454D2991E9B4C0C804544D8A9AD0F6184725E20D63C3155F0AEB4230B016" },
-  { name = "gleeunit", version = "1.0.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "D364C87AFEB26BDB4FB8A5ABDE67D635DC9FA52D6AB68416044C35B096C6882D" },
+  { name = "filepath", version = "1.1.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "65F51013BCF78A603AFFD7992EF1CC6ECA96C74038EB48887F656DE44DBC1902" },
+  { name = "gleam_stdlib", version = "0.58.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "091F2D2C4A3A4E2047986C47E2C2C9D728A4E068ABB31FDA17B0D347E6248467" },
+  { name = "gleeunit", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "0E6C83834BA65EDCAAF4FE4FB94AC697D9262D83E6F58A750D63C9F6C8A9D9FF" },
 ]
 
 [requirements]
-filepath = { version = "~> 1.0"}
-gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
-gleeunit = { version = "~> 1.0" }
+filepath = { version = ">= 1.0.0 and < 2.0.0" }
+gleam_stdlib = { version = ">= 0.34.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }
diff --git a/src/simplifile_js.mjs b/src/simplifile_js.mjs
index 0de01a5..827a0df 100644
--- a/src/simplifile_js.mjs
+++ b/src/simplifile_js.mjs
@@ -27,7 +27,9 @@ export function readBits(filepath) {
  * @returns {Ok | GError}
  */
 export function writeBits(filepath, contents) {
-  return gleamResult(() => fs.writeFileSync(path.normalize(filepath), contents.buffer));
+  return gleamResult(() =>
+    fs.writeFileSync(path.normalize(filepath), contents.rawBuffer),
+  );
 }
 
 /**
@@ -38,7 +40,9 @@ export function writeBits(filepath, contents) {
  * @returns {Ok | GError}
  */
 export function appendBits(filepath, contents) {
-  return gleamResult(() => fs.appendFileSync(path.normalize(filepath), contents.buffer));
+  return gleamResult(() =>
+    fs.appendFileSync(path.normalize(filepath), contents.rawBuffer),
+  );
 }
 
 /**
@@ -163,7 +167,9 @@ export function readDirectory(filepath) {
  * @returns {Ok | GError}
  */
 export function copyFile(srcpath, destpath) {
-  return gleamResult(() => fs.copyFileSync(path.normalize(srcpath), path.normalize(destpath)));
+  return gleamResult(() =>
+    fs.copyFileSync(path.normalize(srcpath), path.normalize(destpath)),
+  );
 }
 
 /**
@@ -174,7 +180,9 @@ export function copyFile(srcpath, destpath) {
  * @returns {Ok | GError}
  */
 export function renameFile(srcpath, destpath) {
-  return gleamResult(() => fs.renameSync(path.normalize(srcpath), path.normalize(destpath)));
+  return gleamResult(() =>
+    fs.renameSync(path.normalize(srcpath), path.normalize(destpath)),
+  );
 }
 
 /**
@@ -204,8 +212,8 @@ export function currentDirectory() {
  */
 export function fileInfo(filepath) {
   return gleamResult(() => {
-    const stat = fs.statSync(path.normalize(filepath))
-    return new FileInfo(stat)
+    const stat = fs.statSync(path.normalize(filepath));
+    return new FileInfo(stat);
   });
 }
 
@@ -215,9 +223,9 @@ export function fileInfo(filepath) {
  */
 export function linkInfo(filepath) {
   return gleamResult(() => {
-    const stat = fs.lstatSync(path.normalize(filepath))
-    return new FileInfo(stat)
-  })
+    const stat = fs.lstatSync(path.normalize(filepath));
+    return new FileInfo(stat);
+  });
 }
 
 class FileInfo {