diff --git a/package-lock.json b/package-lock.json
index 2b363f1..400f661 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -75,6 +75,7 @@
           "version": "1.8.4",
           "resolved": "https://registry.npmjs.org/gaxios/-/gaxios-1.8.4.tgz",
           "integrity": "sha512-BoENMnu1Gav18HcpV9IleMPZ9exM+AvUjrAOV4Mzs/vfz2Lu/ABv451iEXByKiMPn2M140uul1txXCg83sAENw==",
+          "optional": true,
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             "extend": "^3.0.2",
@@ -182,7 +183,8 @@
     "@google-cloud/promisify": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/@google-cloud/promisify/-/promisify-0.4.0.tgz",
-      "integrity": "sha512-4yAHDC52TEMCNcMzVC8WlqnKKKq+Ssi2lXoUg9zWWkZ6U6tq9ZBRYLHHCRdfU+EU9YJsVmivwGcKYCjRGjnf4Q=="
+      "integrity": "sha512-4yAHDC52TEMCNcMzVC8WlqnKKKq+Ssi2lXoUg9zWWkZ6U6tq9ZBRYLHHCRdfU+EU9YJsVmivwGcKYCjRGjnf4Q==",
+      "optional": true
     },
     "@google-cloud/storage": {
       "version": "2.5.0",
@@ -461,12 +463,11 @@
       "optional": true
     },
     "axios": {
-      "version": "0.19.0",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.19.0.tgz",
-      "integrity": "sha512-1uvKqKQta3KBxIz14F2v06AEHZ/dIoeKfbTRkK1E5oqjDnuEerLmYTgJB5AiQZHJcljpg1TuRzdjDR06qNk0DQ==",
+      "version": "0.21.1",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.1.tgz",
+      "integrity": "sha512-dKQiRHxGD9PPRIUNIWvZhPTPpl1rf/OxTYKsqKUDjBwYylTvV7SjSHJb9ratfyzM6wCdLCOYLzs73qpg5c4iGA==",
       "requires": {
-        "follow-redirects": "1.5.10",
-        "is-buffer": "^2.0.2"
+        "follow-redirects": "^1.10.0"
       }
     },
     "base64-js": {
@@ -935,12 +936,9 @@
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     },
     "follow-redirects": {
-      "version": "1.5.10",
-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
-      "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
-      "requires": {
-        "debug": "=3.1.0"
-      }
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.13.1.tgz",
+      "integrity": "sha512-SSG5xmZh1mkPGyKzjZP8zLjltIfpW32Y5QpdNJyjcfGxK3qo3NDDkZOZSFiGn1A6SclQxY9GzEwAHQ3dmYRWpg=="
     },
     "form-data": {
       "version": "2.5.0",
@@ -1016,6 +1014,7 @@
           "version": "1.8.4",
           "resolved": "https://registry.npmjs.org/gaxios/-/gaxios-1.8.4.tgz",
           "integrity": "sha512-BoENMnu1Gav18HcpV9IleMPZ9exM+AvUjrAOV4Mzs/vfz2Lu/ABv451iEXByKiMPn2M140uul1txXCg83sAENw==",
+          "optional": true,
           "requires": {
             "abort-controller": "^3.0.0",
             "extend": "^3.0.2",
@@ -1027,6 +1026,7 @@
               "version": "3.0.0",
               "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
               "integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
+              "optional": true,
               "requires": {
                 "event-target-shim": "^5.0.0"
               }
@@ -1135,7 +1135,8 @@
     "graceful-fs": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.0.tgz",
-      "integrity": "sha512-jpSvDPV4Cq/bgtpndIWbI5hmYxhQGHPC4d4cqBPb4DLniCfhJokdXhwhaDuLBGLQdvvRum/UiX6ECVIPvDXqdg=="
+      "integrity": "sha512-jpSvDPV4Cq/bgtpndIWbI5hmYxhQGHPC4d4cqBPb4DLniCfhJokdXhwhaDuLBGLQdvvRum/UiX6ECVIPvDXqdg==",
+      "optional": true
     },
     "gtoken": {
       "version": "3.0.2",
@@ -1226,11 +1227,6 @@
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.0.tgz",
       "integrity": "sha512-M4Sjn6N/+O6/IXSJseKqHoFc+5FdGJ22sXqnjTpdZweHK64MzEPAyQZyEU3R/KRv2GLoa7nNtg/C2Ev6m7z+eA=="
     },
-    "is-buffer": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
-      "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw=="
-    },
     "is-obj": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-1.0.1.tgz",
@@ -1490,7 +1486,8 @@
     "pify": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
-      "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g=="
+      "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+      "optional": true
     },
     "process-nextick-args": {
       "version": "2.0.1",
@@ -1530,6 +1527,7 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/pump/-/pump-2.0.1.tgz",
       "integrity": "sha512-ruPMNRkN3MHP1cWJc9OWr+T/xDP0jhXYCLfJcBuX54hhfIBnaQmAUMfDcG4DM5UMWByBbJY69QSphm3jtDKIkA==",
+      "optional": true,
       "requires": {
         "end-of-stream": "^1.1.0",
         "once": "^1.3.1"
@@ -1539,6 +1537,7 @@
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/pumpify/-/pumpify-1.5.1.tgz",
       "integrity": "sha512-oClZI37HvuUJJxSKKrC17bZ9Cu0ZYhEAGPsPUy9KlMUmv9dKX2o77RUmq7f3XjIxbwyGwYzbzQ1L2Ks8sIradQ==",
+      "optional": true,
       "requires": {
         "duplexify": "^3.6.0",
         "inherits": "^2.0.3",
@@ -1712,6 +1711,7 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
       "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
+      "optional": true,
       "requires": {
         "stubs": "^3.0.0"
       }
@@ -1737,12 +1737,14 @@
     "stubs": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls="
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls=",
+      "optional": true
     },
     "teeny-request": {
       "version": "3.11.3",
       "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-3.11.3.tgz",
       "integrity": "sha512-CKncqSF7sH6p4rzCgkb/z/Pcos5efl0DmolzvlqRQUNcpRIruOhY9+T1FsIlyEbfWd7MsFpodROOwHYh2BaXzw==",
+      "optional": true,
       "requires": {
         "https-proxy-agent": "^2.2.1",
         "node-fetch": "^2.2.0",
@@ -1814,7 +1816,8 @@
     "uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "optional": true
     },
     "vary": {
       "version": "1.1.2",
@@ -1860,7 +1863,8 @@
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ="
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
+      "optional": true
     },
     "xmlhttprequest": {
       "version": "1.8.0",
diff --git a/package.json b/package.json
index 80fe1d8..25bdd21 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "dependencies": {
     "@google-cloud/text-to-speech": "^1.1.2",
-    "axios": "^0.19.0",
+    "axios": "^0.21.1",
     "express": "^4.17.1",
     "firebase-admin": "^8.2.0",
     "firebase-functions": "^3.1.0",