diff --git a/Cargo.lock b/Cargo.lock
index c11bbca..b2c3a5b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -169,7 +169,6 @@ dependencies = [
  "rayon",
  "serde",
  "serde_json",
- "thiserror",
  "tracing",
  "tracing-perfetto",
  "tracing-subscriber",
diff --git a/Cargo.toml b/Cargo.toml
index 21a971b..b65d2d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -48,7 +48,6 @@ pastey = "0.2.1"
 rayon = "1.11.0"
 serde = { version = "1.0.228", features = ["derive"], optional = true }
 serde_json = { version = "1.0.145", optional = true }
-thiserror = "2.0.17"
 tracing = { version = "0.1.41", optional = true }
 tracing-perfetto = { version = "0.1.5", optional = true }
 tracing-subscriber = { version = "0.3.20", optional = true }
diff --git a/src/data/block.rs b/src/data/block.rs
index d84bce1..a8c7d3f 100644
--- a/src/data/block.rs
+++ b/src/data/block.rs
@@ -1,6 +1,4 @@
-use std::{fmt, fmt::Display};
-
-use thiserror::Error;
+use std::{error::Error, fmt::{self, Display}};
 
 use crate::data::{
     plane::PlaneOffset,
@@ -255,9 +253,11 @@ impl BlockSize {
     }
 }
 
-#[derive(Debug, Copy, Clone, Error, Eq, PartialEq)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct InvalidBlockSize;
 
+impl Error for InvalidBlockSize {}
+
 impl Display for InvalidBlockSize {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_str("invalid block size")