diff --git a/.github/actions/install-npm-packages/action.yml b/.github/actions/install-npm-packages/action.yml
index 38b021a0..2eb81cba 100644
--- a/.github/actions/install-npm-packages/action.yml
+++ b/.github/actions/install-npm-packages/action.yml
@@ -19,10 +19,10 @@ runs:
       if: inputs.server == 'true'
       shell: bash
       run: |
-        npm i --prefix=app/server
+        npm ci --prefix=app/server
 
     - name: Install static (frontend) NPM packages
       if: inputs.static == 'true'
       shell: bash
       run: |
-        npm i --prefix=app/static
+        npm ci --prefix=app/static
diff --git a/scripts/build-backend.sh b/scripts/build-backend.sh
index c99991fb..80bedef6 100644
--- a/scripts/build-backend.sh
+++ b/scripts/build-backend.sh
@@ -1,5 +1,5 @@
 set -ex
 ROOT=$(realpath $(dirname $0)/..)
 
-npm install --prefix=$ROOT/app/server
+npm ci --prefix=$ROOT/app/server
 npm run build --prefix=$ROOT/app/server
diff --git a/scripts/build.sh b/scripts/build.sh
index 26f98f27..e52e8c31 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -1,7 +1,7 @@
 set -ex
 ROOT=$(realpath $(dirname $0)/..)
 
-npm install --prefix=$ROOT/app/static
+npm ci --prefix=$ROOT/app/static
 npm run build-with-check --prefix=$ROOT/app/static
 
 . $ROOT/scripts/build-backend.sh