diff --git a/server/graphql/resolvers/listing.js b/server/graphql/resolvers/listing.js
index b630f22..41289b4 100644
--- a/server/graphql/resolvers/listing.js
+++ b/server/graphql/resolvers/listing.js
@@ -1,7 +1,20 @@
 const { AuthenticationError } = require('apollo-server');
-
 const Listing = require('../../models/Listing');
 
+// Checks if str is in a valid US currency format
+function isValid_Currency(str) {
+    // regex to check valid US currency
+    let regex = new RegExp(/^\$(\d{1, 3}(\, \d{3})*|(\d+))(\.\d{2})?$/);
+
+    // returns true if the str matched the ReGex
+    if (regex.test(str) == true) {
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
 module.exports = {
   Query: {
     async getListings() {
@@ -31,7 +44,7 @@ module.exports = {
   Mutation: {
     createListing: async (_, { title, description, price, active, pictures, pickup, category }, context) => {
       
-        // Check for empty strings
+      // Check for empty strings
       if (title.trim() === '') {
         throw new Error('Title must not b empty');
       }
@@ -52,19 +65,42 @@ module.exports = {
 
       return listing;
     },
-  },
-};
-
-// Checks if str is in a valid US currency format
-function isValid_Currency(str) {
-    // regex to check valid US currency
-    let regex = new RegExp(/^\$(\d{1, 3}(\, \d{3})*|(\d+))(\.\d{2})?$/);
-
-    // returns true if the str matched the ReGex
-    if (regex.test(str) == true) {
-        return true;
-    }
-    else {
-        return false;
+    updateListing: async (_, { listingId, title, description, price, active, pictures, pickup, category }, context) => {
+      // Create an empty updates object
+      let updates = {};
+    
+      // Only add fields to the updates object if they are not undefined (i.e., provided in the mutation arguments)
+      if (title !== undefined) updates.title = title;
+      if (description !== undefined) updates.description = description;
+      if (price !== undefined) {
+        if (!isValid_Currency(price)) {
+          throw new Error("Price is not in a valid format, don't forget the $!");
+        }
+        updates.price = price;
+      }
+      if (active !== undefined) updates.active = active;
+      if (pictures !== undefined) updates.pictures = pictures;
+      if (pickup !== undefined) updates.pickup = pickup;
+      if (category !== undefined) updates.category = category;
+    
+      try {
+        // Use the updates object to update the MongoDB document.
+        // Fields not included in the updates object will not be affected.
+        const updatedListing = await Listing.findByIdAndUpdate(
+          listingId,
+          updates,
+          { new: true }
+        );
+    
+        if (!updatedListing) {
+          throw new Error('Listing not found');
+        }
+    
+        return updatedListing;
+      } catch (err) {
+        throw new Error(err);
+      }
     }
-}
+  }
+  }
+
diff --git a/server/graphql/typedefs.js b/server/graphql/typedefs.js
index 3b57c12..0ca0cef 100644
--- a/server/graphql/typedefs.js
+++ b/server/graphql/typedefs.js
@@ -38,8 +38,8 @@ module.exports = gql`
     createDog(name: String!): Dog!
     deleteDog(dogId: ID!): String!
     createListing(title: String!, description: String!, price: String!, active: Boolean!, pictures: [ID], pickup: Boolean!, category: String): Listing!
+    updateListing(listingId: ID!, title: String, description: String, price: String, active: Boolean, pictures: [ID], pickup: Boolean, category: String): Listing!
     createUser(netID: String!, firstName: String!, middleInitial: String, lastName: String!, password: String!, email: String!, payment: String!, college: String!): User!
     deleteUser(userId: ID!): String!
   }
-
 `;