diff --git a/e2e/angular-package.test.ts b/e2e/angular-package.test.ts
index 99e8bc635afbc..040fa1b50feab 100644
--- a/e2e/angular-package.test.ts
+++ b/e2e/angular-package.test.ts
@@ -67,7 +67,6 @@ forEachCli('angular', cli => {
             `
         );
       };
-      debugger;
 
       createDep(parentLib, [childLib, childLib2]);
     });
diff --git a/packages/angular/src/builders/package/package.impl.spec.ts b/packages/angular/src/builders/package/package.impl.spec.ts
index ef26af6dec834..c55e17c28f2fe 100644
--- a/packages/angular/src/builders/package/package.impl.spec.ts
+++ b/packages/angular/src/builders/package/package.impl.spec.ts
@@ -149,9 +149,18 @@ describe('AngularLibraryWebBuildBuilder', () => {
     });
 
     it('should update the package.json', async () => {
-      spyOn(workspaceUtils, 'readJsonFile').and.returnValue({
-        name: '@proj/buildable-child',
-        version: '1.2.3'
+      spyOn(workspaceUtils, 'readJsonFile').and.callFake((path: string) => {
+        if (path.endsWith('buildable-parent/package.json')) {
+          return {
+            name: '@proj/buildable-parent',
+            version: '3.3.3'
+          };
+        } else {
+          return {
+            name: '@proj/buildable-child',
+            version: '1.2.3'
+          };
+        }
       });
 
       // act
@@ -168,5 +177,35 @@ describe('AngularLibraryWebBuildBuilder', () => {
         })
       );
     });
+
+    ['dependencies', 'devDependencies', 'peerDependencies'].forEach(
+      (depConfigName: string) => {
+        it(`should not update the package.json if the ${depConfigName} already contain a matching entry`, async () => {
+          spyOn(workspaceUtils, 'readJsonFile').and.callFake((path: string) => {
+            if (path.endsWith('buildable-parent/package.json')) {
+              return {
+                name: '@proj/buildable-parent',
+                version: '1.2.3',
+                [depConfigName]: {
+                  '@proj/buildable-child': '1.1.1'
+                }
+              };
+            } else {
+              return {
+                name: '@proj/buildable-child',
+                version: '1.2.3'
+              };
+            }
+          });
+
+          // act
+          const result = await run(testOptions, context).toPromise();
+
+          // assert
+          expect(result.success).toBeTruthy();
+          expect(fileUtils.writeJsonFile).not.toHaveBeenCalled();
+        });
+      }
+    );
   });
 });
diff --git a/packages/angular/src/builders/package/package.impl.ts b/packages/angular/src/builders/package/package.impl.ts
index c363a6774c41b..0da3b2e20e5c5 100644
--- a/packages/angular/src/builders/package/package.impl.ts
+++ b/packages/angular/src/builders/package/package.impl.ts
@@ -6,7 +6,7 @@ import {
 import { JsonObject } from '@angular-devkit/core';
 import { stripIndents } from '@angular-devkit/core/src/utils/literals';
 import * as ng from '@angular/compiler-cli';
-import { readJsonFile } from '@nrwl/workspace';
+import { readJsonFile, output } from '@nrwl/workspace';
 import {
   createProjectGraph,
   ProjectGraphNode,
@@ -149,6 +149,15 @@ export function calculateLibraryDependencies(
     .filter(x => !!x);
 }
 
+// verify whether the package.json already specifies the dep
+function hasDependency(outputJson, depConfigName: string, packageName: string) {
+  if (outputJson[depConfigName]) {
+    return outputJson[depConfigName][packageName];
+  } else {
+    return false;
+  }
+}
+
 /**
  * Updates the peerDependencies section in the `dist/lib/xyz/package.json` with
  * the proper dependency and version
@@ -168,11 +177,16 @@ function updatePackageJsonDependencies(
   const jsonOutputFile = `${distLibOutputPath}/package.json`;
   if (libDependencies && libDependencies.length > 0) {
     const outputJson = readJsonFile(jsonOutputFile);
+    let writeJson = false;
 
     outputJson.dependencies = outputJson.dependencies || {};
 
     libDependencies.forEach(entry => {
-      if (!outputJson.dependencies[entry.scope]) {
+      if (
+        !hasDependency(outputJson, 'dependencies', entry.scope) &&
+        !hasDependency(outputJson, 'devDependencies', entry.scope) &&
+        !hasDependency(outputJson, 'peerDependencies', entry.scope)
+      ) {
         // read the lib version (should we read the one from the dist?)
         const packageJsonPath = join(
           context.workspaceRoot,
@@ -182,10 +196,13 @@ function updatePackageJsonDependencies(
         const depNodePackageJson = readJsonFile(packageJsonPath);
 
         outputJson.dependencies[entry.scope] = depNodePackageJson.version;
+        writeJson = true;
       }
     });
 
-    writeJsonFile(jsonOutputFile, outputJson);
+    if (writeJson) {
+      writeJsonFile(jsonOutputFile, outputJson);
+    }
   }
 }