diff --git a/Jenkinsfile b/Jenkinsfile
index cecdb3c7b..a2907f0b6 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -49,9 +49,8 @@ try {
             checkout scm
         }
 
-
         stage('Build site') {
-            /* If the slave can't gather resources and build the site in 60 minutes,
+            /* If the agent can't gather resources and build the site in 60 minutes,
             * something is very wrong
             */
             timeout(60) {
@@ -60,6 +59,14 @@ try {
                     set -o nounset
                     set -o pipefail
                     set -o xtrace
+                    make update
+                    if ! git diff-index --quiet HEAD -- Gemfile.lock package-lock.json ; then
+                        echo "A node or ruby dependency has changed."
+                        git diff
+                        echo "Run 'make update' and commit resulting changes."
+                        exit 1
+                    fi
+
                     mkdir -p build
                     make all 2>&1 | tee build/log.txt
                     if [[ -n "$( grep --fixed-strings WARNING build/log.txt | grep --fixed-strings --invert-match user-handbook.adoc | grep --fixed-strings --invert-match 'conversion missing in backend pdf' )" ]] ; then
diff --git a/Makefile b/Makefile
index 2ab94d359..9fc15d585 100644
--- a/Makefile
+++ b/Makefile
@@ -51,6 +51,11 @@ $(OUTPUT_DIR)/releases.rss: $(OUTPUT_DIR) scripts/release.rss.groovy
 #######################################################
 depends: depends-ruby depends-node
 
+# update dependencies information
+update:
+	./scripts/ruby bundle update
+	./scripts/node npm update
+
 depends-ruby: vendor/gems
 
 vendor/gems: Gemfile Gemfile.lock
@@ -60,8 +65,8 @@ vendor/gems: Gemfile Gemfile.lock
 depends-node: node_modules
 
 node_modules: package.json package-lock.json
-		./scripts/node npm install
-		@touch node_modules
+	./scripts/node npm install
+	@touch node_modules
 
 assets: depends-node
 	mkdir -p $(ASSETS_DIR)
@@ -106,4 +111,4 @@ clean:
 #######################################################
 
 .PHONY: all archive assets clean depends depends-node depends-ruby \
-		fetch fetch-reset generate pdfs prepare run site
+		fetch fetch-reset generate pdfs prepare run site update
diff --git a/package.json b/package.json
index ca77d2d51..4f6f617cf 100644
--- a/package.json
+++ b/package.json
@@ -5,10 +5,10 @@
   "keywords": [],
   "author": "",
   "dependencies": {
-    "bootstrap": "4.0.0-alpha.6",
     "anchor-js": "3.2.2",
-    "tether": "1.4.0",
-    "ionicons": "2.0.1"
+    "bootstrap": "4.0.0-alpha.6",
+    "ionicons": "2.0.1",
+    "tether": "1.4.0"
   },
   "homepage": "https://jenkins.io"
 }