diff --git a/package-lock.json b/package-lock.json
index d71c62dc1..09a2ff723 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,11 +11,11 @@
       "dependencies": {
         "@babel/runtime-corejs3": "^7.22.15",
         "@scarf/scarf": "=1.4.0",
-        "@swagger-api/apidom-core": ">=1.0.0-beta.39 <1.0.0-rc.0",
-        "@swagger-api/apidom-error": ">=1.0.0-beta.39 <1.0.0-rc.0",
-        "@swagger-api/apidom-json-pointer": ">=1.0.0-beta.39 <1.0.0-rc.0",
-        "@swagger-api/apidom-ns-openapi-3-1": ">=1.0.0-beta.39 <1.0.0-rc.0",
-        "@swagger-api/apidom-reference": ">=1.0.0-beta.39 <1.0.0-rc.0",
+        "@swagger-api/apidom-core": ">=1.0.0-beta.40 <1.0.0-rc.0",
+        "@swagger-api/apidom-error": ">=1.0.0-beta.40 <1.0.0-rc.0",
+        "@swagger-api/apidom-json-pointer": ">=1.0.0-beta.40 <1.0.0-rc.0",
+        "@swagger-api/apidom-ns-openapi-3-1": ">=1.0.0-beta.40 <1.0.0-rc.0",
+        "@swagger-api/apidom-reference": ">=1.0.0-beta.40 <1.0.0-rc.0",
         "@swaggerexpert/cookie": "^2.0.2",
         "deepmerge": "~4.3.0",
         "fast-json-patch": "^3.0.0-1",
diff --git a/package.json b/package.json
index 3d3dd359a..029dcd050 100644
--- a/package.json
+++ b/package.json
@@ -74,11 +74,11 @@
   "dependencies": {
     "@babel/runtime-corejs3": "^7.22.15",
     "@scarf/scarf": "=1.4.0",
-    "@swagger-api/apidom-core": ">=1.0.0-beta.39 <1.0.0-rc.0",
-    "@swagger-api/apidom-error": ">=1.0.0-beta.39 <1.0.0-rc.0",
-    "@swagger-api/apidom-json-pointer": ">=1.0.0-beta.39 <1.0.0-rc.0",
-    "@swagger-api/apidom-ns-openapi-3-1": ">=1.0.0-beta.39 <1.0.0-rc.0",
-    "@swagger-api/apidom-reference": ">=1.0.0-beta.39 <1.0.0-rc.0",
+    "@swagger-api/apidom-core": ">=1.0.0-beta.40 <1.0.0-rc.0",
+    "@swagger-api/apidom-error": ">=1.0.0-beta.40 <1.0.0-rc.0",
+    "@swagger-api/apidom-json-pointer": ">=1.0.0-beta.40 <1.0.0-rc.0",
+    "@swagger-api/apidom-ns-openapi-3-1": ">=1.0.0-beta.40 <1.0.0-rc.0",
+    "@swagger-api/apidom-reference": ">=1.0.0-beta.40 <1.0.0-rc.0",
     "@swaggerexpert/cookie": "^2.0.2",
     "deepmerge": "~4.3.0",
     "fast-json-patch": "^3.0.0-1",
diff --git a/src/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/visitors/all-of.js b/src/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/visitors/all-of.js
index f7782aeb1..1c05ea101 100644
--- a/src/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/visitors/all-of.js
+++ b/src/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/visitors/all-of.js
@@ -1,4 +1,12 @@
-import { isArrayElement, deepmerge } from '@swagger-api/apidom-core';
+import { uniqWith } from 'ramda';
+import {
+  isArrayElement,
+  isObjectElement,
+  deepmerge,
+  toValue,
+  cloneShallow,
+  includesClasses,
+} from '@swagger-api/apidom-core';
 import { isSchemaElement } from '@swagger-api/apidom-ns-openapi-3-1';
 
 import toPath from '../utils/to-path.js';
@@ -37,7 +45,39 @@ class AllOfVisitor {
       while (schemaElement.hasKey('allOf')) {
         const { allOf } = schemaElement;
         schemaElement.remove('allOf');
-        const allOfMerged = deepmerge.all([...allOf.content, schemaElement]);
+        const allOfMerged = deepmerge.all([...allOf.content, schemaElement], {
+          customMerge: (keyElement) => {
+            if (toValue(keyElement) === 'enum') {
+              return (targetElement, sourceElement) => {
+                if (
+                  includesClasses(['json-schema-enum'], targetElement) &&
+                  includesClasses(['json-schema-enum'], sourceElement)
+                ) {
+                  const areElementsEqual = (a, b) => {
+                    if (
+                      isArrayElement(a) ||
+                      isArrayElement(b) ||
+                      isObjectElement(a) ||
+                      isObjectElement(b)
+                    ) {
+                      return false;
+                    }
+                    return a.equals(toValue(b));
+                  };
+                  const clone = cloneShallow(targetElement);
+                  clone.content = uniqWith(areElementsEqual)([
+                    ...targetElement.content,
+                    ...sourceElement.content,
+                  ]);
+
+                  return clone;
+                }
+                return deepmerge(targetElement, sourceElement);
+              };
+            }
+            return deepmerge;
+          },
+        });
 
         /**
          * If there was not an original $$ref value, make sure to remove
diff --git a/src/resolver/specmap/lib/index.js b/src/resolver/specmap/lib/index.js
index 159318864..35718f8cd 100644
--- a/src/resolver/specmap/lib/index.js
+++ b/src/resolver/specmap/lib/index.js
@@ -39,7 +39,19 @@ function applyPatch(obj, patch, opts) {
     jsonPatch.applyPatch(obj, [replace(patch.path, newValue)]);
   } else if (patch.op === 'mergeDeep') {
     const currentValue = getInByJsonPath(obj, patch.path);
-    const newValue = deepmerge(currentValue, patch.value);
+    const newValue = deepmerge(currentValue, patch.value, {
+      customMerge: (key) => {
+        if (key === 'enum') {
+          return (targetElement, sourceElement) => {
+            if (Array.isArray(targetElement) && Array.isArray(sourceElement)) {
+              return [...new Set([...targetElement, ...sourceElement])];
+            }
+            return deepmerge(targetElement, sourceElement);
+          };
+        }
+        return undefined;
+      },
+    });
     obj = jsonPatch.applyPatch(obj, [replace(patch.path, newValue)]).newDocument;
   } else if (patch.op === 'add' && patch.path === '' && isObject(patch.value)) {
     // { op: 'add', path: '', value: { a: 1, b: 2 }}
diff --git a/test/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/schema-object/all-of.js b/test/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/schema-object/all-of.js
index e4cedcb57..7b69d2154 100644
--- a/test/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/schema-object/all-of.js
+++ b/test/resolver/apidom/reference/dereference/strategies/openapi-3-1-swagger-client/schema-object/all-of.js
@@ -1018,6 +1018,51 @@ describe('dereference', () => {
             },
           });
         });
+
+        test('should not duplicate primitive `enum` values nested in `allOf`', async () => {
+          const spec = OpenApi3_1Element.refract({
+            openapi: '3.1.0',
+            components: {
+              schemas: {
+                one: {
+                  allOf: [
+                    {
+                      properties: {
+                        foo: { enum: [1, 2, 3, 4] },
+                        bar: { enum: [{ enum: [1, 2, 3] }, { enum: [1, 2, 3, 4] }] },
+                      },
+                    },
+                    {
+                      properties: {
+                        foo: { enum: [1, 2, 3, 5, { enum: [1, 2, 3] }] },
+                        bar: { enum: [{ enum: [1, 2, 3, 4] }] },
+                      },
+                    },
+                  ],
+                },
+              },
+            },
+          });
+          const dereferenced = await dereferenceApiDOM(spec, {
+            parse: { mediaType: mediaTypes.latest('json') },
+          });
+
+          expect(toValue(dereferenced)).toEqual({
+            openapi: '3.1.0',
+            components: {
+              schemas: {
+                one: {
+                  properties: {
+                    foo: { enum: [1, 2, 3, 4, 5, { enum: [1, 2, 3] }] },
+                    bar: {
+                      enum: [{ enum: [1, 2, 3] }, { enum: [1, 2, 3, 4] }, { enum: [1, 2, 3, 4] }],
+                    },
+                  },
+                },
+              },
+            },
+          });
+        });
       });
     });
   });
diff --git a/test/resolver/strategies/generic/index.js b/test/resolver/strategies/generic/index.js
index 6ce0f1721..6e9c1563b 100644
--- a/test/resolver/strategies/generic/index.js
+++ b/test/resolver/strategies/generic/index.js
@@ -890,6 +890,40 @@ describe('resolver', () => {
     });
   });
 
+  test('should not duplicate primitive `enum` values nested in `allOf`', () => {
+    // Given
+    const spec = {
+      allOf: [
+        {
+          properties: {
+            foo: { enum: [1, 2, 3, 4] },
+            bar: { enum: [{ enum: [1, 2, 3] }, { enum: [1, 2, 3, 4] }] },
+          },
+        },
+        {
+          properties: {
+            foo: { enum: [1, 2, 3, 5] },
+            bar: { enum: [{ enum: [1, 2, 3, 4] }] },
+          },
+        },
+      ],
+    };
+
+    // When
+    return Swagger.resolve({ spec }).then(handleResponse);
+
+    // Then
+    function handleResponse(obj) {
+      expect(obj.errors).toEqual([]);
+      expect(obj.spec).toEqual({
+        properties: {
+          foo: { enum: [1, 2, 3, 4, 5] },
+          bar: { enum: [{ enum: [1, 2, 3] }, { enum: [1, 2, 3, 4] }, { enum: [1, 2, 3, 4] }] },
+        },
+      });
+    }
+  });
+
   test('should not throw errors on resvered-keywords in freely-named-fields', () => {
     // Given
     const ReservedKeywordSpec = jsYaml.load(