diff --git a/packages/graphql-tools/package.json b/packages/graphql-tools/package.json
index 35c043a3298..c38cc5f464d 100644
--- a/packages/graphql-tools/package.json
+++ b/packages/graphql-tools/package.json
@@ -24,6 +24,13 @@
     "@graphql-tools/import": "6.0.0",
     "@graphql-tools/links": "6.0.0",
     "@graphql-tools/load": "6.0.0",
+    "@graphql-tools/code-file-loader": "6.0.0",
+    "@graphql-tools/git-loader": "6.0.0",
+    "@graphql-tools/github-loader": "6.0.0",
+    "@graphql-tools/graphql-file-loader": "6.0.0",
+    "@graphql-tools/json-file-loader": "6.0.0",
+    "@graphql-tools/module-loader": "6.0.0",
+    "@graphql-tools/url-loader": "6.0.0",
     "@graphql-tools/load-files": "6.0.0",
     "@graphql-tools/merge": "6.0.0",
     "@graphql-tools/mock": "6.0.0",
@@ -31,6 +38,7 @@
     "@graphql-tools/resolvers-composition": "6.0.0",
     "@graphql-tools/schema": "6.0.0",
     "@graphql-tools/stitch": "6.0.0",
-    "@graphql-tools/utils": "6.0.0"
+    "@graphql-tools/utils": "6.0.0",
+    "@graphql-tools/wrap": "6.0.0"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/graphql-tools/src/index.ts b/packages/graphql-tools/src/index.ts
index 21cc2ff88f0..3e91ade0a88 100644
--- a/packages/graphql-tools/src/index.ts
+++ b/packages/graphql-tools/src/index.ts
@@ -3,6 +3,12 @@ export * from '@graphql-tools/graphql-tag-pluck';
 export * from '@graphql-tools/import';
 export * from '@graphql-tools/links';
 export * from '@graphql-tools/load';
+export * from '@graphql-tools/code-file-loader';
+export * from '@graphql-tools/git-loader';
+export * from '@graphql-tools/github-loader';
+export * from '@graphql-tools/graphql-file-loader';
+export * from '@graphql-tools/module-loader';
+export * from '@graphql-tools/url-loader';
 export * from '@graphql-tools/load-files';
 export * from '@graphql-tools/merge';
 export * from '@graphql-tools/mock';
diff --git a/packages/merge/package.json b/packages/merge/package.json
index 26f2450b868..71ec153a75f 100644
--- a/packages/merge/package.json
+++ b/packages/merge/package.json
@@ -27,4 +27,4 @@
     "access": "public",
     "directory": "dist"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/merge/tests/merge-schemas.spec.ts b/packages/merge/tests/merge-schemas.spec.ts
index 94888671c51..2415f062ad9 100644
--- a/packages/merge/tests/merge-schemas.spec.ts
+++ b/packages/merge/tests/merge-schemas.spec.ts
@@ -1,5 +1,5 @@
 import { makeExecutableSchema } from '@graphql-tools/schema';
-import { graphql, buildSchema, GraphQLScalarType, Kind, GraphQLSchema, ListValueNode } from 'graphql';
+import { graphql, buildSchema, GraphQLScalarType, Kind, GraphQLSchema, ListValueNode, printSchema } from 'graphql';
 import { mergeSchemas, mergeSchemasAsync } from '../src/merge-schemas';
 
 describe('Merge Schemas', () => {
@@ -411,7 +411,7 @@ describe('Merge Schemas', () => {
 
         expect(merged.getDirective('date')).toBeDefined();
       });
-      it.only('should merge a lot of directives but without high memory usage', () => {
+      it('should merge a lot of directives but without high memory usage', () => {
           let num = 100;
           const base = buildSchema(/* GraphQL */`
               directive @access(roles: [String]) on FIELD_DEFINITION
@@ -429,4 +429,69 @@ describe('Merge Schemas', () => {
 
         expect((prev.getQueryType().getFields().test.astNode.directives[0].arguments[0].value as ListValueNode).values).toHaveLength(1);
       });
+      it('should merge schemas with custom scalars', () => {
+        const GraphQLUUID = new GraphQLScalarType({
+            name: 'UUID',
+            serialize: val => val,
+            parseValue: val => val,
+            parseLiteral: valueNode => {
+                if (valueNode.kind === 'StringValue') {
+                    return valueNode.value;
+                }
+                return null;
+            }
+        })
+        const countrySchema = makeExecutableSchema({
+          typeDefs: `
+            scalar UUID
+            type Country {
+              id: UUID!
+              name: String
+            }
+            type Query {
+              country: Country
+            }
+          `,
+          resolvers: {
+            UUID: GraphQLUUID,
+          }
+        })
+
+
+        const citySchema = makeExecutableSchema({
+          typeDefs: `
+            scalar UUID
+            type City {
+              id: ID!
+              name: String
+            }
+            type Query {
+              city: City
+            }
+          `,
+        })
+
+        const mergedSchema = mergeSchemas({
+            schemas: [
+                countrySchema,
+                citySchema,
+            ]
+        });
+
+        expect(printSchema(mergedSchema)).toContain(`
+type Query {
+    country: Country
+    city: City
+}
+scalar UUID
+type Country {
+    id: UUID!
+    name: String
+}
+type City {
+  id: ID!
+  name: String
+}
+        `)
+      })
 });
diff --git a/packages/utils/src/mergeDeep.ts b/packages/utils/src/mergeDeep.ts
index ae5a389ec9a..8aea0df65cb 100644
--- a/packages/utils/src/mergeDeep.ts
+++ b/packages/utils/src/mergeDeep.ts
@@ -1,10 +1,16 @@
-export function mergeDeep(target: any, ...sources: any): any {
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+import { isScalarType } from 'graphql';
+
+export function mergeDeep(target: any, ...sources: any[]): any {
+  if (isScalarType(target)) {
+    return target;
+  }
   const output = {
     ...target,
   };
-  sources.forEach((source: any) => {
+  for (const source of sources) {
     if (isObject(target) && isObject(source)) {
-      Object.keys(source).forEach(key => {
+      for (const key in source) {
         if (isObject(source[key])) {
           if (!(key in target)) {
             Object.assign(output, { [key]: source[key] });
@@ -14,9 +20,9 @@ export function mergeDeep(target: any, ...sources: any): any {
         } else {
           Object.assign(output, { [key]: source[key] });
         }
-      });
+      }
     }
-  });
+  }
   return output;
 }
 
diff --git a/yarn.lock b/yarn.lock
index 70d8eae28ed..73760d69cb6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6322,6 +6322,11 @@ graphql-type-json@0.3.1:
   resolved "https://registry.yarnpkg.com/graphql-type-json/-/graphql-type-json-0.3.1.tgz#47fca2b1fa7adc0758d165b33580d7be7a6cf548"
   integrity sha512-1lPkUXQ2L8o+ERLzVAuc3rzc/E6pGF+6HnjihCVTK0VzR0jCuUd92FqNxoHdfILXqOn2L6b4y47TBxiPyieUVA==
 
+graphql-type-uuid@0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/graphql-type-uuid/-/graphql-type-uuid-0.2.0.tgz#677a363a93d1b04c4844d20b35ffab7a1d5e6b6a"
+  integrity sha1-Z3o2OpPRsExIRNILNf+reh1ea2o=
+
 graphql-upload@10.0.0:
   version "10.0.0"
   resolved "https://registry.yarnpkg.com/graphql-upload/-/graphql-upload-10.0.0.tgz#1020c8ac6208c8cdf9de1f6ad9000eab7467e00f"