diff --git a/.circleci/config.yml b/.circleci/config.yml
index 596829ebf6..0d315dd985 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -29,7 +29,7 @@ jobs:
       - restore_cache:
           key: angular-{{ .Branch }}-{{ checksum "yarn.lock" }}
 
-      - run: yarn install
+      - run: yarn install --freeze-lockfile --non-interactive
       - run: ./node_modules/.bin/gulp lint
 
   build:
diff --git a/scripts/ci/install.sh b/scripts/ci/install.sh
index a1510242fb..04d3b0c424 100755
--- a/scripts/ci/install.sh
+++ b/scripts/ci/install.sh
@@ -37,7 +37,7 @@ travisFoldEnd "install-yarn"
 
 # Install all npm dependencies according to yarn.lock
 travisFoldStart "yarn-install"
-  node tools/npm/check-node-modules --purge || yarn install
+  node tools/npm/check-node-modules --purge || yarn install --freeze-lockfile --non-interactive
 travisFoldEnd "yarn-install"