diff --git a/Cargo.toml b/Cargo.toml
index 809545033..3b2275ec2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ downcast-rs = "1.2.0"
 enum_dispatch = "0.3.11"
 html-escape = "0.2.13"
 itertools = "0.13.0"
-jsonschema = "0.19.1"
+jsonschema = "0.21.0"
 lazy_static = "1.4.0"
 num-rational = "0.4.1"
 paste = "1.0"
@@ -45,7 +45,7 @@ proptest = "1.4.0"
 proptest-derive = "0.5.0"
 regex = "1.9.5"
 regex-syntax = "0.8.3"
-rstest = "0.22.0"
+rstest = "0.23.0"
 serde = "1.0"
 serde_json = "1.0.97"
 serde_yaml = "0.9.19"
diff --git a/hugr-core/src/hugr/serialize/test.rs b/hugr-core/src/hugr/serialize/test.rs
index 67ed0a057..22ae2895c 100644
--- a/hugr-core/src/hugr/serialize/test.rs
+++ b/hugr-core/src/hugr/serialize/test.rs
@@ -23,7 +23,7 @@ use crate::types::{
 use crate::{type_row, OutgoingPort};
 
 use itertools::Itertools;
-use jsonschema::{Draft, JSONSchema};
+use jsonschema::{Draft, Validator};
 use lazy_static::lazy_static;
 use portgraph::LinkView;
 use portgraph::{multiportgraph::MultiPortGraph, Hierarchy, LinkMut, PortMut, UnmanagedDenseMap};
@@ -45,11 +45,11 @@ struct SerTestingLatest {
 
 struct NamedSchema {
     name: &'static str,
-    schema: JSONSchema,
+    schema: Validator,
 }
 
 impl NamedSchema {
-    pub fn new(name: &'static str, schema: JSONSchema) -> Self {
+    pub fn new(name: &'static str, schema: Validator) -> Self {
         Self { name, schema }
     }
 
@@ -84,9 +84,9 @@ macro_rules! include_schema {
                         concat!("../../../../specification/schema/", $path, "_live.json")
                     ))
                     .unwrap();
-                    JSONSchema::options()
+                    Validator::options()
                         .with_draft(Draft::Draft7)
-                        .compile(&schema_val)
+                        .build(&schema_val)
                         .expect("Schema is invalid.")
                 });
         }