diff --git a/.tool-versions b/.tool-versions
index c0ae215..0854e9f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
-gleam 0.30.2
-erlang 25.2.2
-elixir 1.14.3-otp-25
+gleam 0.33.0
+erlang 26.1.2
+elixir 1.15.7-otp-26
diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 35e9bce..3f1f4d4 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,8 @@
+5.0.0
+-----
+
+* Updated for Gleam 0.33.
+
 4.0.0
 -----
 
diff --git a/gleam.toml b/gleam.toml
index e835a53..4b237a1 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -1,7 +1,7 @@
 name = "finch_gleam"
-version = "4.0.0"
+version = "5.0.0"
 target = "erlang"
-gleam = ">= 0.30.0"
+gleam = ">= 0.33.0"
 
 # Fill out these fields if you intend to generate HTML documentation or publish
 # your project to the Hex package manager.
@@ -12,11 +12,11 @@ repository = { type = "gitlab", user = "Nicd", repo = "finch_gleam" }
 links = []
 
 [dependencies]
-gleam_stdlib = "~> 0.28"
-gleam_erlang = "~> 0.18"
-gleam_http = "~> 3.1"
+gleam_stdlib = "~> 0.34"
+gleam_erlang = "~> 0.23"
+gleam_http = "~> 3.5"
 finch = "~> 0.16"
 
 [dev-dependencies]
-gleeunit = "~> 0.10"
-mist = "~> 0.11"
+gleeunit = "~> 1.0"
+mist = "~> 0.15"
diff --git a/manifest.toml b/manifest.toml
index 4e462f0..51441bf 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -3,17 +3,17 @@
 
 packages = [
   { name = "castore", version = "1.0.3", build_tools = ["mix"], requirements = [], otp_app = "castore", source = "hex", outer_checksum = "680AB01EF5D15B161ED6A95449FAC5C6B8F60055677A8E79ACF01B27BAA4390B" },
-  { name = "finch", version = "0.16.0", build_tools = ["mix"], requirements = ["mint", "castore", "telemetry", "nimble_pool", "mime", "nimble_options"], otp_app = "finch", source = "hex", outer_checksum = "F660174C4D519E5FEC629016054D60EDD822CDFE2B7270836739AC2F97735EC5" },
-  { name = "gleam_erlang", version = "0.19.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "720D1E0A0CEBBD51C4AA88501D1D4FBFEF4AA7B3332C994691ED944767A52582" },
-  { name = "gleam_http", version = "3.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "D034F5CE0639CD142CBA210B7D5D14236C284B0C5772A043D2E22128594573AE" },
-  { name = "gleam_otp", version = "0.5.3", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_erlang"], otp_app = "gleam_otp", source = "hex", outer_checksum = "6E705B69464237353E0380AC8143BDB29A3F0BF6168755D5F2D6E55A34A8B077" },
-  { name = "gleam_stdlib", version = "0.30.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "03710B3DA047A3683117591707FCA19D32B980229DD8CE8B0603EB5B5144F6C3" },
-  { name = "gleeunit", version = "0.10.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "ECEA2DE4BE6528D36AFE74F42A21CDF99966EC36D7F25DEB34D47DD0F7977BAF" },
-  { name = "glisten", version = "0.7.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_otp", "gleam_stdlib"], otp_app = "glisten", source = "hex", outer_checksum = "52B530FF25370590843998D1B6C4EC6169DB1300D5E4407A5CDA1575374B7AEC" },
+  { name = "finch", version = "0.16.0", build_tools = ["mix"], requirements = ["mime", "castore", "telemetry", "nimble_options", "mint", "nimble_pool"], otp_app = "finch", source = "hex", outer_checksum = "F660174C4D519E5FEC629016054D60EDD822CDFE2B7270836739AC2F97735EC5" },
+  { name = "gleam_erlang", version = "0.23.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "C21CFB816C114784E669FFF4BBF433535EEA9960FA2F216209B8691E87156B96" },
+  { name = "gleam_http", version = "3.5.3", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "C2FC3322203B16F897C1818D9810F5DEFCE347F0751F3B44421E1261277A7373" },
+  { name = "gleam_otp", version = "0.8.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_erlang"], otp_app = "gleam_otp", source = "hex", outer_checksum = "18EF8242A5E54BA92F717C7222F03B3228AEE00D1F286D4C56C3E8C18AA2588E" },
+  { 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 = "glisten", version = "0.9.2", build_tools = ["gleam"], requirements = ["gleam_otp", "gleam_stdlib", "gleam_erlang"], otp_app = "glisten", source = "hex", outer_checksum = "C960B6CF25D4AABAB01211146E9B57E11827B9C49E4175217E0FB7EF5BCB0FF7" },
   { name = "hpax", version = "0.1.2", build_tools = ["mix"], requirements = [], otp_app = "hpax", source = "hex", outer_checksum = "2C87843D5A23F5F16748EBE77969880E29809580EFDACCD615CD3BED628A8C13" },
   { name = "mime", version = "2.0.5", build_tools = ["mix"], requirements = [], otp_app = "mime", source = "hex", outer_checksum = "DA0D64A365C45BC9935CC5C8A7FC5E49A0E0F9932A761C55D6C52B142780A05C" },
-  { name = "mint", version = "1.5.1", build_tools = ["mix"], requirements = ["hpax", "castore"], otp_app = "mint", source = "hex", outer_checksum = "4A63E1E76A7C3956ABD2C72F370A0D0AECDDC3976DEA5C27ECCBECFA5E7D5B1E" },
-  { name = "mist", version = "0.12.0", build_tools = ["gleam"], requirements = ["gleam_otp", "gleam_erlang", "gleam_stdlib", "glisten", "gleam_http"], otp_app = "mist", source = "hex", outer_checksum = "6FD3D24B0E79CA90AE07A695C2ADA2049E16A384BEF960B122E841DE88B6CA67" },
+  { name = "mint", version = "1.5.1", build_tools = ["mix"], requirements = ["castore", "hpax"], otp_app = "mint", source = "hex", outer_checksum = "4A63E1E76A7C3956ABD2C72F370A0D0AECDDC3976DEA5C27ECCBECFA5E7D5B1E" },
+  { name = "mist", version = "0.15.0", build_tools = ["gleam"], requirements = ["gleam_stdlib", "gleam_erlang", "glisten", "gleam_otp", "gleam_http"], otp_app = "mist", source = "hex", outer_checksum = "49F51DDB64D7B2832F72727CC9721C478D6B524C96EA444C601A19D01E023C03" },
   { name = "nimble_options", version = "1.0.2", build_tools = ["mix"], requirements = [], otp_app = "nimble_options", source = "hex", outer_checksum = "FD12A8DB2021036CE12A309F26F564EC367373265B53E25403F0EE697380F1B8" },
   { name = "nimble_pool", version = "1.0.0", build_tools = ["mix"], requirements = [], otp_app = "nimble_pool", source = "hex", outer_checksum = "80BE3B882D2D351882256087078E1B1952A28BF98D0A287BE87E4A24A710B67A" },
   { name = "telemetry", version = "1.2.1", build_tools = ["rebar3"], requirements = [], otp_app = "telemetry", source = "hex", outer_checksum = "DAD9CE9D8EFFC621708F99EAC538EF1CBE05D6A874DD741DE2E689C47FEAFED5" },
@@ -21,8 +21,8 @@ packages = [
 
 [requirements]
 finch = { version = "~> 0.16" }
-gleam_erlang = { version = "~> 0.18" }
-gleam_http = { version = "~> 3.1" }
-gleam_stdlib = { version = "~> 0.28" }
-gleeunit = { version = "~> 0.10" }
-mist = { version = "~> 0.11" }
+gleam_erlang = { version = "~> 0.23" }
+gleam_http = { version = "~> 3.5" }
+gleam_stdlib = { version = "~> 0.34" }
+gleeunit = { version = "~> 1.0" }
+mist = { version = "~> 0.15" }
diff --git a/src/finch.gleam b/src/finch.gleam
index ac7e577..58e4c87 100644
--- a/src/finch.gleam
+++ b/src/finch.gleam
@@ -6,13 +6,13 @@
 import gleam/result
 import gleam
 import gleam/uri
-import gleam/erlang/atom.{Atom}
+import gleam/erlang/atom.{type Atom}
 import gleam/http
 import gleam/http/request as gleam_request
 import gleam/http/response as gleam_response
-import finch/headers.{Headers}
-import finch/stream.{StreamFun}
-import finch/otp.{InstanceOptions, OnStart}
+import finch/headers.{type Headers}
+import finch/stream.{type StreamFun}
+import finch/otp.{type InstanceOptions, type OnStart}
 
 // Finch's HTTP method type
 type Method {
diff --git a/src/finch/otp.gleam b/src/finch/otp.gleam
index 1467f8e..949f118 100644
--- a/src/finch/otp.gleam
+++ b/src/finch/otp.gleam
@@ -1,11 +1,11 @@
 //// Types related to OTP usage of Finch.
 
 import gleam/uri
-import gleam/dynamic.{Dynamic}
-import gleam/map.{Map}
-import gleam/erlang/atom.{Atom}
-import gleam/erlang/process.{Pid}
-import finch/timeout.{Timeout}
+import gleam/dynamic.{type Dynamic}
+import gleam/dict.{type Dict}
+import gleam/erlang/atom.{type Atom}
+import gleam/erlang/process.{type Pid}
+import finch/timeout.{type Timeout}
 
 pub type UnixSocketPath {
   Local(path: String)
@@ -42,7 +42,7 @@ pub type PoolOptions =
 
 pub type InstanceOption {
   Name(Atom)
-  Pools(Map(PoolSpecifier, PoolOptions))
+  Pools(Dict(PoolSpecifier, PoolOptions))
 }
 
 pub type InstanceOptions =
diff --git a/src/finch/stream.gleam b/src/finch/stream.gleam
index 88d1dd3..c385a0d 100644
--- a/src/finch/stream.gleam
+++ b/src/finch/stream.gleam
@@ -1,10 +1,10 @@
-import finch/headers.{Headers as ReqHeaders}
+import finch/headers.{type Headers as ReqHeaders}
 
 /// A block of data sent by Finch from the HTTP request stream.
 pub type StreamBlock {
   Status(status: Int)
   Headers(headers: ReqHeaders)
-  Data(data: BitString)
+  Data(data: BitArray)
 }
 
 /// A stream handler function
diff --git a/test/finch_gleam_test.gleam b/test/finch_gleam_test.gleam
index 35a107f..061e2a7 100644
--- a/test/finch_gleam_test.gleam
+++ b/test/finch_gleam_test.gleam
@@ -1,11 +1,11 @@
 import gleeunit
 import gleeunit/should
-import mist
-import gleam/bit_builder
+import mist.{type Connection}
+import gleam/bytes_builder
 import gleam/http
 import gleam/http/request
 import gleam/http/response
-import gleam/erlang/atom.{Atom}
+import gleam/erlang/atom.{type Atom}
 import gleam/erlang/process
 import gleam/uri
 import gleam/string
@@ -17,28 +17,33 @@ const base_url = "http://localhost:33100"
 
 pub fn main() {
   let assert Ok(_) =
-    mist.run_service(
-      33_100,
-      fn(req) {
-        case req.method, request.path_segments(req) {
-          http.Get, ["ok"] ->
-            response.new(200)
-            |> response.set_body(bit_builder.from_string("OK"))
+    fn(req: request.Request(Connection)) {
+      case req.method, request.path_segments(req) {
+        http.Get, ["ok"] ->
+          response.new(200)
+          |> response.set_body(mist.Bytes(bytes_builder.from_string("OK")))
 
-          http.Post, ["post"] ->
-            response.new(500)
-            |> response.set_body(bit_builder.from_bit_string(req.body))
-
-          http.Delete, ["headers"] ->
-            response.new(200)
-            |> response.set_body(bit_builder.from_string(string.inspect(
-              req.headers,
-            )))
-            |> response.set_header("x-token", "token-x")
+        http.Post, ["post"] -> {
+          let assert Ok(req) = mist.read_body(req, 4_000_000)
+          response.new(500)
+          |> response.set_body(
+            mist.Bytes(bytes_builder.from_bit_array(req.body)),
+          )
         }
-      },
-      max_body_limit: 4_000_000,
-    )
+
+        http.Delete, ["headers"] ->
+          response.new(200)
+          |> response.set_body(
+            mist.Bytes(bytes_builder.from_string(string.inspect(req.headers))),
+          )
+          |> response.set_header("x-token", "token-x")
+
+        _, _ -> panic
+      }
+    }
+    |> mist.new()
+    |> mist.port(33_100)
+    |> mist.start_http()
 
   configure_logger([Level(None)])
 
@@ -113,7 +118,7 @@ fn headers_url() {
   base_url <> "/headers"
 }
 
-fn with_finch(test: fn() -> a) {
+fn with_finch(real_test: fn() -> a) {
   let subject: process.Subject(process.Pid) = process.new_subject()
 
   process.start(
@@ -132,7 +137,7 @@ fn with_finch(test: fn() -> a) {
     process.new_selector()
     |> process.selecting_process_down(monitor, fn(down) { down })
 
-  test()
+  real_test()
 
   process.kill(finch_pid)
   let assert Ok(_) = process.select(selector, 1000)