diff --git a/amp-update-cache/package-lock.json b/amp-update-cache/package-lock.json
index e81003a04..ccd602275 100644
--- a/amp-update-cache/package-lock.json
+++ b/amp-update-cache/package-lock.json
@@ -53,6 +53,13 @@
         "amp-toolbox-cache-list": "^0.1.0",
         "amp-toolbox-cache-url": "^1.0.2",
         "jsrsasign": "^8.0.12"
+      },
+      "dependencies": {
+        "jsrsasign": {
+          "version": "8.0.24",
+          "resolved": "https://registry.npmjs.org/jsrsasign/-/jsrsasign-8.0.24.tgz",
+          "integrity": "sha512-u45jAyusqUpyGbFc2IbHoeE4rSkoBWQgLe/w99temHenX+GyCz4nflU5sjK7ajU1ffZTezl6le7u43Yjr/lkQg=="
+        }
       }
     },
     "append-field": {
@@ -303,9 +310,9 @@
       "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
     },
     "jsrsasign": {
-      "version": "8.0.12",
-      "resolved": "https://registry.npmjs.org/jsrsasign/-/jsrsasign-8.0.12.tgz",
-      "integrity": "sha1-Iqu5ZW00owuVMENnIINeicLlwxY="
+      "version": "10.9.0",
+      "resolved": "https://registry.npmjs.org/jsrsasign/-/jsrsasign-10.9.0.tgz",
+      "integrity": "sha512-QWLUikj1SBJGuyGK8tjKSx3K7Y69KYJnrs/pQ1KZ6wvZIkHkWjZ1PJDpuvc1/28c1uP0KW9qn1eI1LzHQqDOwQ=="
     },
     "media-typer": {
       "version": "0.3.0",
diff --git a/amp-update-cache/package.json b/amp-update-cache/package.json
index 70fe861a8..c8b877b29 100644
--- a/amp-update-cache/package.json
+++ b/amp-update-cache/package.json
@@ -12,7 +12,7 @@
   "dependencies": {
     "amp-toolbox-update-cache": "^1.0.0",
     "express": "^4.14.1",
-    "jsrsasign": "^8.0.0",
+    "jsrsasign": "^10.0.0",
     "mime-types": "^2.1.15",
     "multer": "^1.3.0",
     "node-fetch": "^2.0.0",