diff --git a/src/extension/alterschema/common/required_properties_in_properties.h b/src/extension/alterschema/common/required_properties_in_properties.h
index 26739fae5..f4e7a1793 100644
--- a/src/extension/alterschema/common/required_properties_in_properties.h
+++ b/src/extension/alterschema/common/required_properties_in_properties.h
@@ -78,10 +78,12 @@ class RequiredPropertiesInProperties final : public SchemaTransformRule {
                                const SchemaWalker &walker,
                                const SchemaResolver &resolver,
                                const JSON::String &property) const -> bool {
-    if (location.parent.has_value()) {
-      const auto &parent_pointer{location.parent.value()};
-      const auto relative_pointer{
-          location.pointer.resolve_from(parent_pointer)};
+    auto current_pointer = location.pointer;
+    auto current_parent = location.parent;
+
+    while (current_parent.has_value()) {
+      const auto &parent_pointer{current_parent.value()};
+      const auto relative_pointer{current_pointer.resolve_from(parent_pointer)};
       assert(!relative_pointer.empty() && relative_pointer.at(0).is_property());
       const auto parent{
           frame.traverse(frame.uri(parent_pointer).value().get())};
@@ -89,14 +91,21 @@ class RequiredPropertiesInProperties final : public SchemaTransformRule {
       const auto type{walker(relative_pointer.at(0).to_property(),
                              frame.vocabularies(parent.value().get(), resolver))
                           .type};
-      if (type == SchemaKeywordType::ApplicatorElementsInPlaceSome ||
-          type == SchemaKeywordType::ApplicatorElementsInPlace ||
-          type == SchemaKeywordType::ApplicatorValueInPlaceMaybe ||
-          type == SchemaKeywordType::ApplicatorValueInPlaceNegate ||
-          type == SchemaKeywordType::ApplicatorValueInPlaceOther) {
-        return this->defined_in_properties_sibling(get(root, parent_pointer),
-                                                   property);
+      if (type != SchemaKeywordType::ApplicatorElementsInPlaceSome &&
+          type != SchemaKeywordType::ApplicatorElementsInPlace &&
+          type != SchemaKeywordType::ApplicatorValueInPlaceMaybe &&
+          type != SchemaKeywordType::ApplicatorValueInPlaceNegate &&
+          type != SchemaKeywordType::ApplicatorValueInPlaceOther) {
+        return false;
+      }
+
+      if (this->defined_in_properties_sibling(get(root, parent_pointer),
+                                              property)) {
+        return true;
       }
+
+      current_pointer = parent_pointer;
+      current_parent = parent.value().get().parent;
     }
 
     return false;
diff --git a/test/alterschema/alterschema_lint_2020_12_test.cc b/test/alterschema/alterschema_lint_2020_12_test.cc
index 4069963d4..ba496eff7 100644
--- a/test/alterschema/alterschema_lint_2020_12_test.cc
+++ b/test/alterschema/alterschema_lint_2020_12_test.cc
@@ -9512,3 +9512,155 @@ TEST(AlterSchema_lint_2020_12, empty_object_as_true_3) {
 
   EXPECT_EQ(document, expected);
 }
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_1) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ {} ],
+    "properties": {
+      "term1": true,
+      "term2": true
+    },
+    "oneOf": [
+      { "required": [ "term1" ], "not": { "required": [ "term2" ] } },
+      { "required": [ "term2" ], "not": { "required": [ "term1" ] } }
+    ]
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_TRUE(result.first);
+  EXPECT_EQ(traces.size(), 0);
+}
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_2) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ [] ],
+    "properties": {
+      "term1": true,
+      "term2": true
+    },
+    "items": {
+      "not": { "required": [ "term2" ] }
+    }
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_FALSE(result.first);
+  EXPECT_EQ(traces.size(), 1);
+  EXPECT_LINT_TRACE(
+      traces, 0, "/items/not", "required_properties_in_properties",
+      "Every property listed in the `required` keyword must be explicitly "
+      "defined using the `properties` keyword",
+      true);
+}
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_3) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ {} ],
+    "properties": {
+      "foo": true,
+      "bar": true
+    },
+    "if": { "type": "object" },
+    "then": {
+      "oneOf": [
+        { "not": { "required": [ "foo" ] } },
+        { "not": { "required": [ "bar" ] } }
+      ]
+    }
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_TRUE(result.first);
+  EXPECT_EQ(traces.size(), 0);
+}
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_4) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ {} ],
+    "properties": {
+      "foo": true
+    },
+    "if": { "required": [ "foo" ] },
+    "then": { "not": { "required": [ "foo" ] } }
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_TRUE(result.first);
+  EXPECT_EQ(traces.size(), 0);
+}
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_5) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ [] ],
+    "properties": {
+      "foo": true
+    },
+    "oneOf": [
+      {
+        "items": {
+          "not": { "required": [ "foo" ] }
+        }
+      }
+    ]
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_FALSE(result.first);
+  EXPECT_EQ(traces.size(), 1);
+  EXPECT_LINT_TRACE(
+      traces, 0, "/oneOf/0/items/not", "required_properties_in_properties",
+      "Every property listed in the `required` keyword must be explicitly "
+      "defined using the `properties` keyword",
+      true);
+}
+
+TEST(AlterSchema_lint_2020_12, object_oneof_required_not_required_6) {
+  const sourcemeta::core::JSON document = sourcemeta::core::parse_json(R"JSON({
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "title": "Test",
+    "description": "A test",
+    "examples": [ {} ],
+    "properties": {
+      "foo": true,
+      "bar": true
+    },
+    "allOf": [
+      {
+        "oneOf": [
+          { "not": { "required": [ "foo" ] } },
+          { "not": { "required": [ "bar" ] } }
+        ]
+      }
+    ]
+  })JSON");
+
+  LINT_WITHOUT_FIX(document, result, traces);
+
+  EXPECT_FALSE(result.first);
+  EXPECT_EQ(traces.size(), 1);
+  EXPECT_LINT_TRACE(
+      traces, 0, "", "unnecessary_allof_wrapper",
+      "Keywords inside `allOf` that do not conflict with the parent schema "
+      "can be elevated",
+      true);
+}