diff --git a/gleam.toml b/gleam.toml
index 2df21f8..751eabb 100644
--- a/gleam.toml
+++ b/gleam.toml
@@ -15,6 +15,7 @@ version = "1.0.0"
 
 [dependencies]
 gleam_stdlib = "~> 0.34 or ~> 1.0"
+pprint = "~> 1.0"
 
 [dev-dependencies]
 gleeunit = "~> 1.0"
diff --git a/manifest.toml b/manifest.toml
index 1ee80fb..38b3a4a 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -2,10 +2,23 @@
 # You typically do not need to edit this file
 
 packages = [
+  { name = "argv", version = "1.0.1", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "A6E9009E50BBE863EB37D963E4315398D41A3D87D0075480FC244125808F964A" },
+  { name = "birdie", version = "1.0.4", build_tools = ["gleam"], requirements = ["argv", "filepath", "gap", "gleam_community_ansi", "gleam_erlang", "gleam_stdlib", "gleeunit", "justin", "rank", "simplifile"], otp_app = "birdie", source = "hex", outer_checksum = "0F7E16A3B12957B5B4A3B39152BD6D6175941AF40C1838F86C5A909DCFF7CF04" },
+  { name = "filepath", version = "0.2.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "FC1B1B29438A5BA6C990F8047A011430BEC0C5BA638BFAA62718C4EAEFE00435" },
+  { name = "gap", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib"], otp_app = "gap", source = "hex", outer_checksum = "2EE1B0A17E85CF73A0C1D29DA315A2699117A8F549C8E8D89FA8261BE41EDEB1" },
+  { name = "glam", version = "2.0.0", build_tools = ["gleam"], requirements = ["birdie", "gleam_stdlib"], otp_app = "glam", source = "hex", outer_checksum = "1C10BE5EA72659E409DC2325BA5E94E0CC92C6C50B2A1DBADE6D07E8C9484D51" },
+  { name = "gleam_community_ansi", version = "1.4.0", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "FE79E08BF97009729259B6357EC058315B6FBB916FAD1C2FF9355115FEB0D3A4" },
+  { name = "gleam_community_colour", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "A49A5E3AE8B637A5ACBA80ECB9B1AFE89FD3D5351FF6410A42B84F666D40D7D5" },
+  { name = "gleam_erlang", version = "0.24.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "26BDB52E61889F56A291CB34167315780EE4AA20961917314446542C90D1C1A0" },
   { name = "gleam_stdlib", version = "0.35.1", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "5443EEB74708454B65650FEBBB1EF5175057D1DEC62AEA9D7C6D96F41DA79152" },
   { name = "gleeunit", version = "1.0.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "D364C87AFEB26BDB4FB8A5ABDE67D635DC9FA52D6AB68416044C35B096C6882D" },
+  { name = "justin", version = "1.0.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "justin", source = "hex", outer_checksum = "7FA0C6DB78640C6DC5FBFD59BF3456009F3F8B485BF6825E97E1EB44E9A1E2CD" },
+  { name = "pprint", version = "1.0.0", build_tools = ["gleam"], requirements = ["glam", "gleam_stdlib"], otp_app = "pprint", source = "hex", outer_checksum = "2764575188B81F2AE1F9AFE57308B7078CA27EBE2AC797EBA272017550B5CF31" },
+  { name = "rank", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "rank", source = "hex", outer_checksum = "5660E361F0E49CBB714CC57CC4C89C63415D8986F05B2DA0C719D5642FAD91C9" },
+  { name = "simplifile", version = "1.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "EB9AA8E65E5C1E3E0FDCFC81BC363FD433CB122D7D062750FFDF24DE4AC40116" },
 ]
 
 [requirements]
 gleam_stdlib = { version = "~> 0.34 or ~> 1.0" }
 gleeunit = { version = "~> 1.0" }
+pprint = { version = "~> 1.0"}
diff --git a/src/type_inference.gleam b/src/type_inference.gleam
index 13f3505..a5ed9e8 100644
--- a/src/type_inference.gleam
+++ b/src/type_inference.gleam
@@ -1,4 +1,3 @@
-import gleam/io
 import gleam/int
 import gleam/list
 import gleam/bool
@@ -6,6 +5,7 @@ import gleam/pair
 import gleam/dict.{type Dict}
 import gleam/result.{try}
 import gleam/option.{type Option, None, Some}
+import pprint
 
 // ---- TYPES ------------------------------------------------------------------
 
@@ -86,7 +86,7 @@ pub fn main() {
     body: EApply(EVariable("add"), [EInt(1), EInt(2)]),
   )
   |> infer_expression(initial_environment())
-  |> io.debug
+  |> pprint.debug
   Nil
 }