diff --git a/package.json b/package.json
index aca98f3..099eccd 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "ng": "ng",
     "start": "ng serve --proxy-config proxy.conf.json",
     "build": "ng build",
+    "postinstall": "npm rebuild node-sass", //https://github.com/yarnpkg/yarn/issues/1981
     "test": "ng test",
     "test-sr": "ng test --browsers PhantomJS -sr",
     "ci": "ng lint && ng test --browsers PhantomJS -sr",
diff --git a/yarn.lock b/yarn.lock
index 7bdf335..6fe51b4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3011,7 +3011,7 @@ lodash.uniq@^4.5.0:
   version "4.5.0"
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
 
-lodash@4.14.2, lodash@^4.11.1:
+lodash@4.14.2, lodash@^4.0.1, lodash@^4.11.1:
   version "4.14.2"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.14.2.tgz#bbccce6373a400fbfd0a8c67ca42f6d1ef416432"
 
@@ -3019,7 +3019,7 @@ lodash@^3.8.0:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
 
-lodash@^4.0.0, lodash@^4.0.1, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0, lodash@^4.5.0:
+lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.2, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.3.0, lodash@^4.5.0:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"