diff --git a/CHANGELOG.md b/CHANGELOG.md
index 695ca11bc..cf8f7d51d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+### 41.4.6 [#1210](https://github.com/openfisca/openfisca-core/pull/1210)
+
+#### Technical changes
+
+- Abide by OpenAPI v3.0.0 instead of v3.1.0
+  - Drop support for `propertyNames` in `Values` definition
+
 ### 41.4.5 [#1209](https://github.com/openfisca/openfisca-core/pull/1209)
 
 #### Technical changes
diff --git a/openfisca_web_api/openAPI.yml b/openfisca_web_api/openAPI.yml
index 5eb1d8cf5..ce935e559 100644
--- a/openfisca_web_api/openAPI.yml
+++ b/openfisca_web_api/openAPI.yml
@@ -1,4 +1,4 @@
-openapi: "3.1.0"
+openapi: "3.0.0"
 
 info:
   title: "{COUNTRY_PACKAGE_NAME} Web API"
@@ -137,8 +137,8 @@ components:
       type: "object"
       additionalProperties:
         $ref: "#/components/schemas/Value"
-      propertyNames:  # this keyword is part of JSON Schema but is not supported in OpenAPI Specification at the time of writing, see https://swagger.io/docs/specification/data-models/keywords/#unsupported
-        pattern: "^[12][0-9]{3}-[01][0-9]-[0-3][0-9]$"  # all keys are ISO dates
+      # propertyNames:  # this keyword is part of JSON Schema but is not supported in OpenAPI v3.0.0
+      # pattern: "^[12][0-9]{3}-[01][0-9]-[0-3][0-9]$"  # all keys are ISO dates
 
     Value:
       oneOf:
diff --git a/setup.py b/setup.py
index bcedf5677..cb41e7ec8 100644
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@
     "idna >=3.4, < 4.0",
     "isort >=5.12.0, < 6.0",
     "mypy >=1.1.1, < 2.0",
-    "openapi-spec-validator >=0.5.6, < 0.6.0",
+    "openapi-spec-validator >=0.7.1, < 0.8.0",
     "pycodestyle >=2.10.0, < 3.0",
     "pylint >=2.17.1, < 3.0",
     "xdoctest >=1.1.1, < 2.0",
@@ -66,7 +66,7 @@
 
 setup(
     name="OpenFisca-Core",
-    version="41.4.5",
+    version="41.4.6",
     author="OpenFisca Team",
     author_email="contact@openfisca.org",
     classifiers=[
diff --git a/tests/web_api/test_spec.py b/tests/web_api/test_spec.py
index 89f221ee0..228cf27eb 100644
--- a/tests/web_api/test_spec.py
+++ b/tests/web_api/test_spec.py
@@ -3,7 +3,7 @@
 
 import dpath.util
 import pytest
-from openapi_spec_validator import openapi_v3_spec_validator
+from openapi_spec_validator import OpenAPIV30SpecValidator
 
 
 def assert_items_equal(x, y):
@@ -62,4 +62,4 @@ def test_situation_definition(body):
 
 
 def test_respects_spec(body):
-    assert not [error for error in openapi_v3_spec_validator.iter_errors(body)]
+    assert not [error for error in OpenAPIV30SpecValidator(body).iter_errors()]