diff --git a/typify-impl/src/value.rs b/typify-impl/src/value.rs
index ac7bfc60..742708b9 100644
--- a/typify-impl/src/value.rs
+++ b/typify-impl/src/value.rs
@@ -142,17 +142,19 @@ impl TypeEntry {
                 let text = value.to_string();
                 let type_path = syn::parse_str::<syn::TypePath>(type_name).unwrap();
 
-                // Deserialize the string to the type; the unwrap() is
+                // Deserialize the string to the type; the runtime expect() is
                 // unfortunate, but unavoidable without getting in the
                 // underpants of the serialized form of these built-in types.
                 quote! {
-                    ::serde_json::from_str::< #type_path >(#text).unwrap()
+                    ::serde_json::from_str::< #type_path >(#text)
+                        .expect("invalid default provided")
                 }
             }
             TypeEntryDetails::JsonValue => {
                 let text = value.to_string();
                 quote! {
-                    ::serde_json::from_str::<::serde_json::Value>(#text).unwrap()
+                    ::serde_json::from_str::<::serde_json::Value>(#text)
+                        .expect("invalid default provided")
                 }
             }
             TypeEntryDetails::Boolean => {
@@ -564,7 +566,8 @@ mod tests {
                 .map(|x| x.to_string()),
             Some(
                 quote! {
-                    ::serde_json::from_str::<::uuid::Uuid>("\"not-a-uuid\"").unwrap()
+                    ::serde_json::from_str::<::uuid::Uuid>("\"not-a-uuid\"")
+                        .expect("invalid default provided")
                 }
                 .to_string()
             ),
diff --git a/typify-impl/tests/vega.out b/typify-impl/tests/vega.out
index c4898a74..cdb59c94 100644
--- a/typify-impl/tests/vega.out
+++ b/typify-impl/tests/vega.out
@@ -44272,8 +44272,10 @@ pub enum VoronoiTransformExtent {
 impl ::std::default::Default for VoronoiTransformExtent {
     fn default() -> Self {
         VoronoiTransformExtent::Array([
-            ::serde_json::from_str::<::serde_json::Value>("[-100000,-100000]").unwrap(),
-            ::serde_json::from_str::<::serde_json::Value>("[100000,100000]").unwrap(),
+            ::serde_json::from_str::<::serde_json::Value>("[-100000,-100000]")
+                .expect("invalid default provided"),
+            ::serde_json::from_str::<::serde_json::Value>("[100000,100000]")
+                .expect("invalid default provided"),
         ])
     }
 }
@@ -45762,8 +45764,10 @@ pub mod defaults {
     }
     pub(super) fn voronoi_transform_extent() -> super::VoronoiTransformExtent {
         super::VoronoiTransformExtent::Array([
-            ::serde_json::from_str::<::serde_json::Value>("[-100000,-100000]").unwrap(),
-            ::serde_json::from_str::<::serde_json::Value>("[100000,100000]").unwrap(),
+            ::serde_json::from_str::<::serde_json::Value>("[-100000,-100000]")
+                .expect("invalid default provided"),
+            ::serde_json::from_str::<::serde_json::Value>("[100000,100000]")
+                .expect("invalid default provided"),
         ])
     }
     pub(super) fn window_transform_frame() -> super::WindowTransformFrame {
diff --git a/typify/tests/schemas/types-with-defaults.rs b/typify/tests/schemas/types-with-defaults.rs
index e50d4f9e..5f434722 100644
--- a/typify/tests/schemas/types-with-defaults.rs
+++ b/typify/tests/schemas/types-with-defaults.rs
@@ -466,7 +466,7 @@ pub mod defaults {
         ::serde_json::from_str::<::chrono::DateTime<::chrono::offset::Utc>>(
             "\"1970-01-01T00:00:00Z\"",
         )
-        .unwrap()
+        .expect("invalid default provided")
     }
     pub(super) fn mr_default_numbers_big_nullable() -> ::std::option::Option<::std::num::NonZeroU64>
     {
@@ -474,12 +474,15 @@ pub mod defaults {
     }
     pub(super) fn test_bed_any() -> ::std::vec::Vec<::serde_json::Value> {
         vec![
-            ::serde_json::from_str::<::serde_json::Value>("[8,6,7]").unwrap(),
-            ::serde_json::from_str::<::serde_json::Value>("[5,3,0,9]").unwrap(),
+            ::serde_json::from_str::<::serde_json::Value>("[8,6,7]")
+                .expect("invalid default provided"),
+            ::serde_json::from_str::<::serde_json::Value>("[5,3,0,9]")
+                .expect("invalid default provided"),
         ]
     }
     pub(super) fn test_bed_id() -> ::uuid::Uuid {
-        ::serde_json::from_str::<::uuid::Uuid>("\"abc123-is-this-a-uuid\"").unwrap()
+        ::serde_json::from_str::<::uuid::Uuid>("\"abc123-is-this-a-uuid\"")
+            .expect("invalid default provided")
     }
     pub(super) fn u_int_container_max_path() -> super::UInt {
         super::UInt(1_i64)