diff --git a/zeppelin-jupyter-interpreter/pom.xml b/zeppelin-jupyter-interpreter/pom.xml
index 90cd1ed87..5dfa977a7 100644
--- a/zeppelin-jupyter-interpreter/pom.xml
+++ b/zeppelin-jupyter-interpreter/pom.xml
@@ -36,7 +36,7 @@
   <properties>
     <interpreter.name>jupyter</interpreter.name>
     <python.py4j.version>0.10.7</python.py4j.version>
-    <grpc.version>1.15.0</grpc.version>
+    <grpc.version>1.28.0</grpc.version>
   </properties>
 
   <dependencies>
@@ -131,9 +131,9 @@
         <groupId>org.xolstice.maven.plugins</groupId>
         <artifactId>protobuf-maven-plugin</artifactId>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:3.3.0:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:3.5.0:exe:${os.detected.classifier}</protocArtifact>
           <pluginId>grpc-java</pluginId>
-          <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.4.0:exe:${os.detected.classifier}</pluginArtifact>
+          <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.28.0:exe:${os.detected.classifier}</pluginArtifact>
         </configuration>
         <executions>
           <execution>
diff --git a/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelClient.java b/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelClient.java
index 51b3b9af2..a8d4c58db 100644
--- a/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelClient.java
+++ b/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelClient.java
@@ -71,7 +71,7 @@ public class JupyterKernelClient {
    * Construct client for accessing RouteGuide server at {@code host:port}.
    */
   public JupyterKernelClient(String host, int port, String kernel) {
-    this(ManagedChannelBuilder.forAddress(host, port).usePlaintext(true), new Properties(),
+    this(ManagedChannelBuilder.forAddress(host, port).usePlaintext(), new Properties(),
             kernel);
   }
 
diff --git a/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelInterpreter.java b/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelInterpreter.java
index 386a69bf4..b7027e60b 100644
--- a/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelInterpreter.java
+++ b/zeppelin-jupyter-interpreter/src/main/java/org/apache/zeppelin/jupyter/JupyterKernelInterpreter.java
@@ -125,7 +125,7 @@ public class JupyterKernelInterpreter extends AbstractInterpreter {
               32 * 1024 * 1024 + ""));
 
       jupyterKernelClient = new JupyterKernelClient(ManagedChannelBuilder.forAddress("127.0.0.1",
-              kernelPort).usePlaintext(true).maxInboundMessageSize(messageSize),
+              kernelPort).usePlaintext().maxInboundMessageSize(messageSize),
               getProperties(), kernel);
       launchJupyterKernel(kernelPort);
     } catch (Exception e) {
diff --git a/zeppelin-web/Gruntfile.js b/zeppelin-web/Gruntfile.js
index c25b56070..58a75f24e 100644
--- a/zeppelin-web/Gruntfile.js
+++ b/zeppelin-web/Gruntfile.js
@@ -373,7 +373,7 @@ module.exports = function(grunt) {
     karma: {
       unit: {
         configFile: 'karma.conf.js',
-        singleRun: true
+        singleRun: false
       }
     }
   });
diff --git a/zeppelin-web/package-lock.json b/zeppelin-web/package-lock.json
index a2b253758..1728d9746 100644
--- a/zeppelin-web/package-lock.json
+++ b/zeppelin-web/package-lock.json
@@ -7931,1201 +7931,6 @@
         }
       }
     },
-    "karma": {
-      "version": "3.1.4",
-      "resolved": "https://registry.npmjs.org/karma/-/karma-3.1.4.tgz",
-      "integrity": "sha512-31Vo8Qr5glN+dZEVIpnPCxEGleqE0EY6CtC2X9TagRV3rRQ3SNrvfhddICkJgUK3AgqpeKSZau03QumTGhGoSw==",
-      "dev": true,
-      "requires": {
-        "bluebird": "3.5.2",
-        "body-parser": "1.18.3",
-        "chokidar": "2.1.6",
-        "colors": "1.1.2",
-        "combine-lists": "1.0.1",
-        "connect": "3.6.6",
-        "core-js": "2.5.7",
-        "di": "0.0.1",
-        "dom-serialize": "2.2.1",
-        "expand-braces": "0.1.2",
-        "flatted": "2.0.1",
-        "glob": "7.1.4",
-        "graceful-fs": "4.1.15",
-        "http-proxy": "1.17.0",
-        "isbinaryfile": "3.0.3",
-        "lodash": "4.17.11",
-        "log4js": "3.0.6",
-        "mime": "2.4.4",
-        "minimatch": "3.0.4",
-        "optimist": "0.6.1",
-        "qjobs": "1.2.0",
-        "range-parser": "1.2.0",
-        "rimraf": "2.6.2",
-        "safe-buffer": "5.1.2",
-        "socket.io": "2.1.1",
-        "source-map": "0.6.1",
-        "tmp": "0.0.33",
-        "useragent": "2.3.0"
-      },
-      "dependencies": {
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-          "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
-          "dev": true
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-            "range-parser": "1.2.0",
-            "url-join": "2.0.5",
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-          "integrity": "sha512-U9AnICnu50HXtiqiDxuli5gLB5PGBo7VvcHx36jRZHwK4vzOYLbImqT4lwWwoMHdQWwEKw736fCHEekokTEKHA==",
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     "kew": {
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@@ -10957,40 +9762,6 @@
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-        "kew": "0.7.0",
-        "progress": "1.1.8",
-        "request": "2.88.0",
-        "request-progress": "2.0.1",
-        "which": "1.3.1"
-      },
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diff --git a/zeppelin-web/package.json b/zeppelin-web/package.json
index de83a629d..8676b0192 100644
--- a/zeppelin-web/package.json
+++ b/zeppelin-web/package.json
@@ -18,11 +18,8 @@
     "dev:helium": "HELIUM_BUNDLE_DEV=true webpack-dev-server --hot",
     "dev:watch": "grunt watch-webpack-dev",
     "dev": "npm-run-all --parallel dev:server lint:watch dev:watch",
-    "test:watch": "karma start karma.conf.js --single-run=false",
     "pree2e": "webdriver-manager update --gecko false --versions.chrome=2.35",
-    "e2e": "protractor protractor.conf.js",
-    "pretest": "npm rebuild phantomjs-prebuilt",
-    "karma-test": "karma start karma.conf.js"
+    "e2e": "protractor protractor.conf.js"
   },
   "dependencies": {
     "angular-ui-grid": "4.4.6",
@@ -80,13 +77,6 @@
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-    "karma-webpack": "^3.0.5",
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     "ng-annotate-loader": "^0.2.0",