diff --git a/Cargo.toml b/Cargo.toml
index 4422ed0..e32e6aa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,6 @@ iri-string = { version = "0.5.0-beta.1", features = ["alloc", "serde", "serde-al
 mime = "0.3"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-thiserror = "1.0"
 time = { version = "0.3.5", features = ["formatting", "parsing"] }
 
 [dev-dependencies]
diff --git a/src/checked.rs b/src/checked.rs
index d722e99..96b4f58 100644
--- a/src/checked.rs
+++ b/src/checked.rs
@@ -1,9 +1,16 @@
 use iri_string::types::IriStr;
 
-#[derive(Debug, thiserror::Error)]
-#[error("IRI failed host and port check")]
+#[derive(Clone, Debug)]
 pub struct CheckError;
 
+impl std::fmt::Display for CheckError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "IRI failed host and port check")
+    }
+}
+
+impl std::error::Error for CheckError {}
+
 pub(crate) fn check<'a, T: AsRef<IriStr>>(
     iri: T,
     host: &str,
diff --git a/src/primitives/unit.rs b/src/primitives/unit.rs
index e9f02b0..50c3151 100644
--- a/src/primitives/unit.rs
+++ b/src/primitives/unit.rs
@@ -242,11 +242,18 @@ enum Length {
     Meters,
 }
 
-#[derive(Clone, Debug, thiserror::Error)]
-#[error("Could not parse units")]
+#[derive(Clone, Debug)]
 /// The error type produced when a Length cannot be parsed
 struct LengthError;
 
+impl std::fmt::Display for LengthError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Could not parse units")
+    }
+}
+
+impl std::error::Error for LengthError {}
+
 impl Length {
     fn is_centimeters(&self) -> bool {
         matches!(self, Length::Centimeters)
diff --git a/src/primitives/xsd_duration.rs b/src/primitives/xsd_duration.rs
index 244ef1f..cbc3f79 100644
--- a/src/primitives/xsd_duration.rs
+++ b/src/primitives/xsd_duration.rs
@@ -45,10 +45,17 @@
 pub struct XsdDuration(pub time::Duration);
 
 /// The error type produced when an XsdDuration cannot be parsed
-#[derive(Clone, Debug, thiserror::Error)]
-#[error("Error parsing Duration")]
+#[derive(Clone, Debug)]
 pub struct XsdDurationError;
 
+impl std::fmt::Display for XsdDurationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Could not parse Duration")
+    }
+}
+
+impl std::error::Error for XsdDurationError {}
+
 impl XsdDuration {
     /// Create a new XsdDuration from a time::Duration
     pub fn new(duration: time::Duration) -> Self {