diff --git a/package-lock.json b/package-lock.json
index cd50f00..2867160 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,8 +12,8 @@
         "js-yaml": "~4.1"
       },
       "devDependencies": {
-        "@antora/asciidoc-loader": "latest",
-        "@asciidoctor/core": "latest",
+        "@antora/asciidoc-loader": "*",
+        "@asciidoctor/core": "*",
         "@asciidoctor/tabs": "1.0.0-beta.6",
         "chai": "~4.3",
         "chai-fs": "~2.0",
@@ -3413,9 +3413,10 @@
       "dev": true
     },
     "node_modules/js-yaml": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
-      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
+      "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
+      "license": "MIT",
       "dependencies": {
         "argparse": "^2.0.1"
       },
@@ -3768,6 +3769,19 @@
         "node": "*"
       }
     },
+    "node_modules/mocha/node_modules/js-yaml": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "argparse": "^2.0.1"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
+      }
+    },
     "node_modules/mocha/node_modules/minimatch": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.0.1.tgz",