diff --git a/crates/uv-resolver/src/exclude_newer.rs b/crates/uv-resolver/src/exclude_newer.rs
index 5787930760684..75564c400a47d 100644
--- a/crates/uv-resolver/src/exclude_newer.rs
+++ b/crates/uv-resolver/src/exclude_newer.rs
@@ -436,7 +436,6 @@ impl std::fmt::Display for ExcludeNewerValue {
 /// This enum represents whether exclude-newer should be disabled for a package,
 /// or if a specific cutoff (absolute or relative) should be used.
 #[derive(Debug, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 pub enum PackageExcludeNewer {
     /// Disable exclude-newer for this package (allow all versions regardless of upload date).
     Disabled,
@@ -444,6 +443,26 @@ pub enum PackageExcludeNewer {
     Enabled(Box<ExcludeNewerValue>),
 }
 
+#[cfg(feature = "schemars")]
+impl schemars::JsonSchema for PackageExcludeNewer {
+    fn schema_name() -> Cow<'static, str> {
+        Cow::Borrowed("PackageExcludeNewer")
+    }
+
+    fn json_schema(generator: &mut schemars::generate::SchemaGenerator) -> schemars::Schema {
+        schemars::json_schema!({
+            "oneOf": [
+                {
+                    "type": "boolean",
+                    "const": false,
+                    "description": "Disable exclude-newer for this package."
+                },
+                generator.subschema_for::<ExcludeNewerValue>(),
+            ]
+        })
+    }
+}
+
 /// A package-specific exclude-newer entry.
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
@@ -804,7 +823,7 @@ impl std::fmt::Display for ExcludeNewer {
 #[cfg(feature = "schemars")]
 impl schemars::JsonSchema for ExcludeNewerValue {
     fn schema_name() -> Cow<'static, str> {
-        Cow::Borrowed("ExcludeNewerTimestamp")
+        Cow::Borrowed("ExcludeNewerValue")
     }
 
     fn json_schema(_generator: &mut schemars::generate::SchemaGenerator) -> schemars::Schema {
diff --git a/uv.schema.json b/uv.schema.json
index 78d3e978628a7..69335a928db68 100644
--- a/uv.schema.json
+++ b/uv.schema.json
@@ -178,7 +178,7 @@
       "description": "Limit candidate packages to those that were uploaded prior to the given date.\n\nAccepts RFC 3339 timestamps (e.g., `2006-12-02T02:07:43Z`), a \"friendly\" duration (e.g.,\n`24 hours`, `1 week`, `30 days`), or an ISO 8601 duration (e.g., `PT24H`, `P7D`, `P30D`).\n\nDurations do not respect semantics of the local time zone and are always resolved to a fixed\nnumber of seconds assuming that a day is 24 hours (e.g., DST transitions are ignored).\nCalendar units such as months and years are not allowed.",
       "anyOf": [
         {
-          "$ref": "#/definitions/ExcludeNewerTimestamp"
+          "$ref": "#/definitions/ExcludeNewerValue"
         },
         {
           "type": "null"
@@ -810,7 +810,7 @@
         "$ref": "#/definitions/PackageExcludeNewer"
       }
     },
-    "ExcludeNewerTimestamp": {
+    "ExcludeNewerValue": {
       "description": "Exclude distributions uploaded after the given timestamp.\n\nAccepts both RFC 3339 timestamps (e.g., `2006-12-02T02:07:43Z`) and local dates in the same format (e.g., `2006-12-02`), as well as relative durations (e.g., `1 week`, `30 days`, `6 months`). Relative durations are resolved to a timestamp at lock time.",
       "type": "string"
     },
@@ -1102,23 +1102,14 @@
       }
     },
     "PackageExcludeNewer": {
-      "description": "Per-package exclude-newer setting.\n\nThis enum represents whether exclude-newer should be disabled for a package,\nor if a specific cutoff (absolute or relative) should be used.",
       "oneOf": [
         {
-          "description": "Disable exclude-newer for this package (allow all versions regardless of upload date).",
-          "type": "string",
-          "const": "Disabled"
+          "description": "Disable exclude-newer for this package.",
+          "type": "boolean",
+          "const": false
         },
         {
-          "description": "Enable exclude-newer with this cutoff for this package.",
-          "type": "object",
-          "properties": {
-            "Enabled": {
-              "$ref": "#/definitions/ExcludeNewerTimestamp"
-            }
-          },
-          "additionalProperties": false,
-          "required": ["Enabled"]
+          "$ref": "#/definitions/ExcludeNewerValue"
         }
       ]
     },
@@ -1232,7 +1223,7 @@
           "description": "Limit candidate packages to those that were uploaded prior to a given point in time.\n\nAccepts a superset of [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) (e.g.,\n`2006-12-02T02:07:43Z`). A full timestamp is required to ensure that the resolver will\nbehave consistently across timezones.",
           "anyOf": [
             {
-              "$ref": "#/definitions/ExcludeNewerTimestamp"
+              "$ref": "#/definitions/ExcludeNewerValue"
             },
             {
               "type": "null"