diff --git a/CHANGELOG.md b/CHANGELOG.md
index f08597f..4e1efe4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 
 
+## [1.1.1](https://github.com/dennemark/prisma-extension-casl/compare/1.1.0...1.1.1) (2024-11-27)
+
+### Bug Fixes
+
+* :bug: deep merge nested rule relations ([bb933e1](https://github.com/dennemark/prisma-extension-casl/commit/bb933e1921a096d9cd08fba83da783a5bcd36a8b))
+
 ## [1.1.0](https://github.com/dennemark/prisma-extension-casl/compare/1.0.1...1.1.0) (2024-11-13)
 
 ### Features
diff --git a/dist/index.js b/dist/index.js
index 6e1381a..49bd519 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1167,6 +1167,26 @@ function convertCreationTreeToSelect(abilities, relationQuery) {
   return Object.keys(relationResult).length > 0 ? relationResult : relationQuery.action === "create" ? {} : null;
 }
 
+// src/deepMerge.ts
+function isObject(item) {
+  return item && typeof item === "object" && !Array.isArray(item);
+}
+function deepMerge(target, ...sources) {
+  if (!sources.length) return target;
+  const source = sources.shift();
+  if (isObject(target) && isObject(source)) {
+    for (const key in source) {
+      if (isObject(source[key])) {
+        if (!target[key]) Object.assign(target, { [key]: {} });
+        deepMerge(target[key], source[key]);
+      } else {
+        Object.assign(target, { [key]: source[key] });
+      }
+    }
+  }
+  return deepMerge(target, ...sources);
+}
+
 // src/applyRuleRelationsQuery.ts
 function mergeArgsAndRelationQuery(args, relationQuery) {
   const mask = {};
@@ -1263,10 +1283,10 @@ function getNestedQueryRelations(args, abilities, action, model, creationSelectQ
         if (model in relationFieldsByModel && relation in relationFieldsByModel[model]) {
           const relationField = relationFieldsByModel[model][relation];
           if (relationField) {
-            const nestedQueryRelations = {
-              ...getNestedQueryRelations(args[method][relation], abilities, action === "all" ? "all" : "read", relationField.type),
-              ...queryRelations[relation]?.select ?? {}
-            };
+            const nestedQueryRelations = deepMerge(
+              getNestedQueryRelations(args[method][relation], abilities, action === "all" ? "all" : "read", relationField.type),
+              typeof queryRelations[relation]?.select === "object" ? queryRelations[relation]?.select : {}
+            );
             if (nestedQueryRelations && Object.keys(nestedQueryRelations).length > 0) {
               queryRelations[relation] = {
                 ...queryRelations[relation] ?? {},
diff --git a/dist/index.mjs b/dist/index.mjs
index cb687ff..d1dca88 100644
--- a/dist/index.mjs
+++ b/dist/index.mjs
@@ -1142,6 +1142,26 @@ function convertCreationTreeToSelect(abilities, relationQuery) {
   return Object.keys(relationResult).length > 0 ? relationResult : relationQuery.action === "create" ? {} : null;
 }
 
+// src/deepMerge.ts
+function isObject(item) {
+  return item && typeof item === "object" && !Array.isArray(item);
+}
+function deepMerge(target, ...sources) {
+  if (!sources.length) return target;
+  const source = sources.shift();
+  if (isObject(target) && isObject(source)) {
+    for (const key in source) {
+      if (isObject(source[key])) {
+        if (!target[key]) Object.assign(target, { [key]: {} });
+        deepMerge(target[key], source[key]);
+      } else {
+        Object.assign(target, { [key]: source[key] });
+      }
+    }
+  }
+  return deepMerge(target, ...sources);
+}
+
 // src/applyRuleRelationsQuery.ts
 function mergeArgsAndRelationQuery(args, relationQuery) {
   const mask = {};
@@ -1238,10 +1258,10 @@ function getNestedQueryRelations(args, abilities, action, model, creationSelectQ
         if (model in relationFieldsByModel && relation in relationFieldsByModel[model]) {
           const relationField = relationFieldsByModel[model][relation];
           if (relationField) {
-            const nestedQueryRelations = {
-              ...getNestedQueryRelations(args[method][relation], abilities, action === "all" ? "all" : "read", relationField.type),
-              ...queryRelations[relation]?.select ?? {}
-            };
+            const nestedQueryRelations = deepMerge(
+              getNestedQueryRelations(args[method][relation], abilities, action === "all" ? "all" : "read", relationField.type),
+              typeof queryRelations[relation]?.select === "object" ? queryRelations[relation]?.select : {}
+            );
             if (nestedQueryRelations && Object.keys(nestedQueryRelations).length > 0) {
               queryRelations[relation] = {
                 ...queryRelations[relation] ?? {},
diff --git a/package.json b/package.json
index 6f74b90..89abd5b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prisma-extension-casl",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Enforce casl abilities on prisma client ",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",