diff --git a/changelog.md b/changelog.md
index fa9396d6..96224de7 100644
--- a/changelog.md
+++ b/changelog.md
@@ -6,7 +6,11 @@ Starting after v5.0.0 release, updates will be declared for schemas independentl
 and (starting with v4.0.0) this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html). Unreleased changes may be indicated under the `Unreleased` heading.
 
 ## [Unreleased](https://github.com/HumanCellAtlas/metadata-schema/tree/staging)
-## [Released](https://github.com/HumanCellAtlas/metadata-schema/)
+
+### [type/project/project.json - v19.0.0] - 2024-03-15
+### Added
+Added DUOS id field. Fixes #1550
+
 
 ### [type/project/project.json - v18.0.0] - 2024-03-04
 ### Added
diff --git a/docs/jsonBrowser/type.md b/docs/jsonBrowser/type.md
index 61e78cf6..d3bc5c0e 100644
--- a/docs/jsonBrowser/type.md
+++ b/docs/jsonBrowser/type.md
@@ -328,6 +328,7 @@ biostudies_accessions | A BioStudies study accession. | array | no |  | BioStudi
 funders | Funding source(s) supporting the project. | array | yes | [See module  funder](module.md#funder) | Funding source(s) |  | 
 estimated_cell_count | An estimated number of cells in this project | integer | no |  | Estimated cell count |  | 10000; 2100000
 data_use_restriction | Data use restrictions that apply to the project. | string | yes |  | Data use restriction | NRES, GRU, GRU-NCU | GRU
+duos_id | A DUOS dataset id. | string | no |  | DUOS ID |  | DUOS-000108; DUOS-000114
 
 ## Specimen from organism
 _Information about the specimen that was collected from the donor organism._
diff --git a/json_schema/type/project/project.json b/json_schema/type/project/project.json
index 895d99c7..b9f28382 100644
--- a/json_schema/type/project/project.json
+++ b/json_schema/type/project/project.json
@@ -177,6 +177,37 @@
             "user_friendly": "Data use restriction",
             "guidelines": "Must be one of: NRES, GRU, GRU-NCU. The use restriction codes are based on the DUO ontology where NRES corresponds to DUO:0000004, GRU corresponds to DUO:0000042, GRU-NCU corresponds to a combination of DUO:0000042 and DUO:0000046",
             "example": "GRU"
+        },
+        "duos_id": {
+            "description": "A DUOS dataset id.",
+            "type": "string",
+            "pattern": "^DUOS-\\d{6}$",
+            "example": "DUOS-000108; DUOS-000114",
+            "user_friendly": "DUOS ID",
+            "guidelines": "Managed access projects are registered in DUOS to regulate access. If the project is managed access record the corresponding DUOS ID here."
+        }
+    },
+    "if" : {
+        "properties": {
+            "data_use_restriction": {
+                "enum": [
+                    "GRU",
+                    "GRU-NCU"
+                ]
+            }
+        }
+    },
+    "then" : {
+        "required": ["duos_id"]
+    },
+    "else" : {
+        "properties": {
+            "data_use_restriction" : {
+                "enum": ["NRES"]
+            },
+            "duos_id" : {
+                "maxLength": 0
+            }
         }
     }
 }
diff --git a/json_schema/versions.json b/json_schema/versions.json
index 9cc9a4d8..cfe177c8 100644
--- a/json_schema/versions.json
+++ b/json_schema/versions.json
@@ -1,5 +1,5 @@
 {
-    "last_update_date": "2024-03-04T14:00:53Z",
+    "last_update_date": "2024-03-15T11:43:55Z",
     "version_numbers": {
         "core": {
             "biomaterial": {
@@ -110,7 +110,7 @@
                 "process": "9.2.0"
             },
             "project": {
-                "project": "18.0.0"
+                "project": "19.0.0"
             },
             "protocol": {
                 "analysis": {
diff --git a/src/schema_linter.py b/src/schema_linter.py
index f8095f12..96edd622 100644
--- a/src/schema_linter.py
+++ b/src/schema_linter.py
@@ -16,7 +16,7 @@
 
 required_schema_fields = ['$schema', 'description', 'additionalProperties', 'title', 'name', 'type', 'properties']
 
-allowed_schema_fields = ['$schema', 'description', 'additionalProperties', 'required', 'title', 'name', 'type', 'properties', 'definitions', 'dependencies']
+allowed_schema_fields = ['$schema', 'description', 'additionalProperties', 'required', 'title', 'name', 'type', 'properties', 'definitions', 'dependencies', 'if', 'then', 'else']
 
 # Properties