diff --git a/package-lock.json b/package-lock.json
index b624dbc..4c28c3b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,7 @@
       "version": "1.1.14",
       "license": "MIT",
       "dependencies": {
-        "@actions/core": "^1.2.6",
+        "@actions/core": "^1.9.0",
         "@actions/exec": "^1.0.4",
         "@actions/io": "^1.0.2",
         "@actions/tool-cache": "^1.6.1",
@@ -33,9 +33,20 @@
       }
     },
     "node_modules/@actions/core": {
-      "version": "1.2.6",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.6.tgz",
-      "integrity": "sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA=="
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.9.0.tgz",
+      "integrity": "sha512-5pbM693Ih59ZdUhgk+fts+bUWTnIdHV3kwOSr+QIoFHMLg7Gzhwm0cifDY/AG68ekEJAkHnQVpcy4f6GjmzBCA==",
+      "dependencies": {
+        "@actions/http-client": "^2.0.1"
+      }
+    },
+    "node_modules/@actions/core/node_modules/@actions/http-client": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.0.1.tgz",
+      "integrity": "sha512-PIXiMVtz6VvyaRsGY268qvj57hXQEpsYogYOu2nrQhlf+XCGmZstmuZBbAybUl1nQGnvS1k1eEsQ69ZoD7xlSw==",
+      "dependencies": {
+        "tunnel": "^0.0.6"
+      }
     },
     "node_modules/@actions/exec": {
       "version": "1.0.4",
@@ -9562,9 +9573,22 @@
   },
   "dependencies": {
     "@actions/core": {
-      "version": "1.2.6",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.6.tgz",
-      "integrity": "sha512-ZQYitnqiyBc3D+k7LsgSBmMDVkOVidaagDG7j3fOym77jNunWRuYx7VSHa9GNfFZh+zh61xsCjRj4JxMZlDqTA=="
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.9.0.tgz",
+      "integrity": "sha512-5pbM693Ih59ZdUhgk+fts+bUWTnIdHV3kwOSr+QIoFHMLg7Gzhwm0cifDY/AG68ekEJAkHnQVpcy4f6GjmzBCA==",
+      "requires": {
+        "@actions/http-client": "^2.0.1"
+      },
+      "dependencies": {
+        "@actions/http-client": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.0.1.tgz",
+          "integrity": "sha512-PIXiMVtz6VvyaRsGY268qvj57hXQEpsYogYOu2nrQhlf+XCGmZstmuZBbAybUl1nQGnvS1k1eEsQ69ZoD7xlSw==",
+          "requires": {
+            "tunnel": "^0.0.6"
+          }
+        }
+      }
     },
     "@actions/exec": {
       "version": "1.0.4",
diff --git a/package.json b/package.json
index 2600873..15788e3 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   },
   "homepage": "https://github.com/peaceiris/actions-mdbook#readme",
   "dependencies": {
-    "@actions/core": "^1.2.6",
+    "@actions/core": "^1.9.0",
     "@actions/exec": "^1.0.4",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^1.6.1",