diff --git a/package-lock.json b/package-lock.json
index a7677821a893..3039875b94c6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -45,43 +45,35 @@
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-      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-4.4.6.tgz",
-      "integrity": "sha1-LuH68lt1fh0SiXkHS+f65SmzvCA=",
+      "version": "5.0.0-rc.8",
+      "resolved": "https://registry.npmjs.org/@angular/compiler/-/compiler-5.0.0-rc.8.tgz",
+      "integrity": "sha1-SIPoBVSoa5u6xoe0pDbMxklirqA=",
       "dev": true,
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-      "resolved": "https://registry.npmjs.org/@angular/compiler-cli/-/compiler-cli-4.4.6.tgz",
-      "integrity": "sha1-uv09HiYOmQh+uajPdTLb1gOrubE=",
+      "version": "5.0.0-rc.8",
+      "resolved": "https://registry.npmjs.org/@angular/compiler-cli/-/compiler-cli-5.0.0-rc.8.tgz",
+      "integrity": "sha1-dO+OATCqmvSSJat0JXfc0ijcc2w=",
       "dev": true,
       "requires": {
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+        "chokidar": "1.7.0",
         "minimist": "1.2.0",
-        "reflect-metadata": "0.1.10"
+        "reflect-metadata": "0.1.10",
+        "tsickle": "0.24.1"
       }
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     "@angular/core": {
-      "version": "4.4.6",
-      "resolved": "https://registry.npmjs.org/@angular/core/-/core-4.4.6.tgz",
-      "integrity": "sha1-EwMf0Q3P5DiHVBmzjyESCVi8I1Q=",
+      "version": "5.0.0-rc.8",
+      "resolved": "https://registry.npmjs.org/@angular/core/-/core-5.0.0-rc.8.tgz",
+      "integrity": "sha1-No2RMn2eFa7WAqqFyqIuiTMOaLs=",
       "dev": true,
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-    "@angular/tsc-wrapped": {
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       "resolved": "https://registry.npmjs.org/@ngtools/json-schema/-/json-schema-1.1.0.tgz",
@@ -1038,6 +1030,7 @@
       "requires": {
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         "async-each": "1.0.1",
+        "fsevents": "1.1.2",
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         "inherits": "2.0.3",
         "is-binary-path": "1.0.1",
@@ -3060,6 +3053,791 @@
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       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
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+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.2.tgz",
+      "integrity": "sha512-Sn44E5wQW4bTHXvQmvSHwqbuiXtduD6Rrjm2ZtUEGbyrig+nUH3t/QD4M4/ZXViY556TBpRgZkHLDx3JxPwxiw==",
+      "optional": true,
+      "requires": {
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+        "node-pre-gyp": "0.6.36"
+      },
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+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true,
+              "optional": true
+            }
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "bundled": true,
+          "requires": {
+            "code-point-at": "1.1.0",
+            "is-fullwidth-code-point": "1.0.0",
+            "strip-ansi": "3.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.0.1",
+          "bundled": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "stringstream": {
+          "version": "0.0.5",
+          "bundled": true,
+          "optional": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "bundled": true,
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        },
+        "strip-json-comments": {
+          "version": "2.0.1",
+          "bundled": true,
+          "optional": true
+        },
+        "tar": {
+          "version": "2.2.1",
+          "bundled": true,
+          "requires": {
+            "block-stream": "0.0.9",
+            "fstream": "1.0.11",
+            "inherits": "2.0.3"
+          }
+        },
+        "tar-pack": {
+          "version": "3.4.0",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "debug": "2.6.8",
+            "fstream": "1.0.11",
+            "fstream-ignore": "1.0.5",
+            "once": "1.4.0",
+            "readable-stream": "2.2.9",
+            "rimraf": "2.6.1",
+            "tar": "2.2.1",
+            "uid-number": "0.0.6"
+          }
+        },
+        "tough-cookie": {
+          "version": "2.3.2",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "punycode": "1.4.1"
+          }
+        },
+        "tunnel-agent": {
+          "version": "0.6.0",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "tweetnacl": {
+          "version": "0.14.5",
+          "bundled": true,
+          "optional": true
+        },
+        "uid-number": {
+          "version": "0.0.6",
+          "bundled": true,
+          "optional": true
+        },
+        "util-deprecate": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "uuid": {
+          "version": "3.0.1",
+          "bundled": true,
+          "optional": true
+        },
+        "verror": {
+          "version": "1.3.6",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "extsprintf": "1.0.2"
+          }
+        },
+        "wide-align": {
+          "version": "1.1.2",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "string-width": "1.0.2"
+          }
+        },
+        "wrappy": {
+          "version": "1.0.2",
+          "bundled": true
+        }
+      }
+    },
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
@@ -7834,9 +8612,9 @@
       }
     },
     "tsickle": {
-      "version": "0.21.6",
-      "resolved": "https://registry.npmjs.org/tsickle/-/tsickle-0.21.6.tgz",
-      "integrity": "sha1-U7Abl5xcE/2xOvs/uVgXflmRWI0=",
+      "version": "0.24.1",
+      "resolved": "https://registry.npmjs.org/tsickle/-/tsickle-0.24.1.tgz",
+      "integrity": "sha512-XloFQZhVhgjpQsi3u2ORNRJvuID5sflOg6HfP093IqAbhE1+fIUXznULpdDwHgG4p+v8w78KdHruQtkWUKx5AQ==",
       "dev": true,
       "requires": {
         "minimist": "1.2.0",
diff --git a/package.json b/package.json
index 25ce6561c2c2..3b060b0d2ac5 100644
--- a/package.json
+++ b/package.json
@@ -103,9 +103,9 @@
     "zone.js": "^0.8.14"
   },
   "devDependencies": {
-    "@angular/compiler": "^4.0.0",
-    "@angular/compiler-cli": "^4.0.0",
-    "@angular/core": "^4.0.0",
+    "@angular/compiler": "^5.0.0-rc.8",
+    "@angular/compiler-cli": "^5.0.0-rc.8",
+    "@angular/core": "^5.0.0-rc.8",
     "@types/common-tags": "^1.2.4",
     "@types/copy-webpack-plugin": "^4.0.0",
     "@types/denodeify": "^1.2.30",
diff --git a/tests/e2e/tests/build/aot/aot-decorators.ts b/tests/e2e/tests/build/aot/aot-decorators.ts
index ef031951ef0c..277868571756 100644
--- a/tests/e2e/tests/build/aot/aot-decorators.ts
+++ b/tests/e2e/tests/build/aot/aot-decorators.ts
@@ -1,13 +1,10 @@
 import {ng} from '../../../utils/process';
 import {appendToFile, expectFileToMatch, prependToFile, replaceInFile} from '../../../utils/fs';
 import {expectToFail} from '../../../utils/utils';
-import {getGlobalVariable} from '../../../utils/env';
+import {ngVersionMatches} from '../../../utils/version';
 
 export default function() {
-
-  // TODO: re-enable this test for ng5.
-  // now we only remove decorators via --build-optimizer
-  if (getGlobalVariable('argv').nightly) {
+  if (!ngVersionMatches('^4.0.0')) {
     return Promise.resolve();
   }
 
diff --git a/tests/e2e/tests/build/platform-server.ts b/tests/e2e/tests/build/platform-server.ts
index f3a238e4c55b..52821d6ba380 100644
--- a/tests/e2e/tests/build/platform-server.ts
+++ b/tests/e2e/tests/build/platform-server.ts
@@ -10,6 +10,7 @@ import {
 } from '../../utils/fs';
 import { ng, silentNpm, exec } from '../../utils/process';
 import { getGlobalVariable } from '../../utils/env';
+import { readNgVersion } from '../../utils/version';
 import { expectToFail } from '../../utils/utils';
 
 export default function () {
@@ -23,7 +24,7 @@ export default function () {
     return Promise.resolve();
   }
 
-  let platformServerVersion = '^4.0.0';
+  let platformServerVersion = readNgVersion();
 
   if (getGlobalVariable('argv').nightly) {
     platformServerVersion = 'github:angular/platform-server-builds';
diff --git a/tests/e2e/utils/version.ts b/tests/e2e/utils/version.ts
new file mode 100644
index 000000000000..0be47e2216e3
--- /dev/null
+++ b/tests/e2e/utils/version.ts
@@ -0,0 +1,12 @@
+import * as fs from 'fs';
+import * as semver from 'semver';
+
+
+export function readNgVersion(): string {
+  const packageJson: any = JSON.parse(fs.readFileSync('./node_modules/@angular/core/package.json', 'utf8'));
+  return packageJson['version'];
+}
+
+export function ngVersionMatches(range: string): boolean {
+  return semver.satisfies(readNgVersion(), range);
+}