diff --git a/package-lock.json b/package-lock.json
index 7b6e155..38b1e39 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,45 +12,50 @@
         "mocha": "^6.2.0",
         "nock": "^11.9.1",
         "request": "^2.88.2",
-        "sinon": "^7.3.1",
+        "sinon": "^21.0.0",
         "supertest": "^4.0.2"
       }
     },
     "node_modules/@sinonjs/commons": {
-      "version": "1.8.3",
-      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
-      "integrity": "sha512-xkNcLAn/wZaX14RPlwizcKicDk9G3F8m2nU3L7Ukm5zBgTwiT0wsoFAHx9Jq56fJA1z/7uKGtCRu16sOUCLIHQ==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-3.0.1.tgz",
+      "integrity": "sha512-K3mCHKQ9sVh8o1C9cxkwxaOmXoAMlDxC1mYyHrjqOWEcBjYr76t96zL2zlj5dUGZ3HSw240X1qgH3Mjf1yJWpQ==",
       "dev": true,
+      "license": "BSD-3-Clause",
       "dependencies": {
         "type-detect": "4.0.8"
       }
     },
-    "node_modules/@sinonjs/formatio": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-3.2.2.tgz",
-      "integrity": "sha512-B8SEsgd8gArBLMD6zpRw3juQ2FVSsmdd7qlevyDqzS9WTCtvF55/gAL+h6gue8ZvPYcdiPdvueM/qm//9XzyTQ==",
+    "node_modules/@sinonjs/fake-timers": {
+      "version": "13.0.5",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-13.0.5.tgz",
+      "integrity": "sha512-36/hTbH2uaWuGVERyC6da9YwGWnzUZXuPro/F2LfsdOsLnCojz/iSH8MxUt/FD2S5XBSVPhmArFUXcpCQ2Hkiw==",
       "dev": true,
+      "license": "BSD-3-Clause",
       "dependencies": {
-        "@sinonjs/commons": "^1",
-        "@sinonjs/samsam": "^3.1.0"
+        "@sinonjs/commons": "^3.0.1"
       }
     },
     "node_modules/@sinonjs/samsam": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.3.tgz",
-      "integrity": "sha512-bKCMKZvWIjYD0BLGnNrxVuw4dkWCYsLqFOUWw8VgKF/+5Y+mE7LfHWPIYoDXowH+3a9LsWDMo0uAP8YDosPvHQ==",
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-8.0.3.tgz",
+      "integrity": "sha512-hw6HbX+GyVZzmaYNh82Ecj1vdGZrqVIn/keDTg63IgAwiQPO+xCz99uG6Woqgb4tM0mUiFENKZ4cqd7IX94AXQ==",
       "dev": true,
+      "license": "BSD-3-Clause",
       "dependencies": {
-        "@sinonjs/commons": "^1.3.0",
-        "array-from": "^2.1.1",
-        "lodash": "^4.17.15"
+        "@sinonjs/commons": "^3.0.1",
+        "type-detect": "^4.1.0"
       }
     },
-    "node_modules/@sinonjs/text-encoding": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.1.tgz",
-      "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
-      "dev": true
+    "node_modules/@sinonjs/samsam/node_modules/type-detect": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.1.0.tgz",
+      "integrity": "sha512-Acylog8/luQ8L7il+geoSxhEkazvkslg7PSNKOX59mbB9cOveP5aq9h74Y7YU8yDpJwetzQQrfIwtf4Wp4LKcw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
     },
     "node_modules/ajv": {
       "version": "6.12.6",
@@ -107,12 +112,6 @@
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-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/array-from/-/array-from-2.1.1.tgz",
-      "integrity": "sha1-z+nYwmYoudxa7MYqn12PHzUsEZU=",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.6.tgz",
@@ -993,12 +992,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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-    "node_modules/isarray": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-      "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
-      "dev": true
-    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
@@ -1063,12 +1056,6 @@
         "node": ">=0.6.0"
       }
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-    "node_modules/just-extend": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-4.2.1.tgz",
-      "integrity": "sha512-g3UB796vUFIY90VIv/WX3L2c8CS2MdWUww3CNrYmqza1Fg0DURc2K/O4YrnklBdQarSJ/y8JnJYDGc+1iumQjg==",
-      "dev": true
-    },
     "node_modules/locate-path": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
@@ -1100,12 +1087,6 @@
         "node": ">=4"
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-    "node_modules/lolex": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/lolex/-/lolex-4.2.0.tgz",
-      "integrity": "sha512-gKO5uExCXvSm6zbF562EvM+rd1kQDnB9AZBbiQVzf1ZmdDpxUSvpnAaVOP83N/31mRK8Ml8/VE8DMvsAZQ+7wg==",
-      "dev": true
-    },
     "node_modules/methods": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
@@ -1223,28 +1204,6 @@
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       "dev": true
     },
-    "node_modules/nise": {
-      "version": "1.5.3",
-      "resolved": "https://registry.npmjs.org/nise/-/nise-1.5.3.tgz",
-      "integrity": "sha512-Ymbac/94xeIrMf59REBPOv0thr+CJVFMhrlAkW/gjCIE58BGQdCj0x7KRCb3yz+Ga2Rz3E9XXSvUyyxqqhjQAQ==",
-      "dev": true,
-      "dependencies": {
-        "@sinonjs/formatio": "^3.2.1",
-        "@sinonjs/text-encoding": "^0.7.1",
-        "just-extend": "^4.0.2",
-        "lolex": "^5.0.1",
-        "path-to-regexp": "^1.7.0"
-      }
-    },
-    "node_modules/nise/node_modules/lolex": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/lolex/-/lolex-5.1.2.tgz",
-      "integrity": "sha512-h4hmjAvHTmd+25JSwrtTIuwbKdwg5NzZVRMLn9saij4SZaepCrTCxPr35H/3bjwfMJtN+t3CX8672UIkglz28A==",
-      "dev": true,
-      "dependencies": {
-        "@sinonjs/commons": "^1.7.0"
-      }
-    },
     "node_modules/nock": {
       "version": "11.9.1",
       "resolved": "https://registry.npmjs.org/nock/-/nock-11.9.1.tgz",
@@ -1416,15 +1375,6 @@
         "node": ">=0.10.0"
       }
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-    "node_modules/path-to-regexp": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-1.8.0.tgz",
-      "integrity": "sha512-n43JRhlUKUAlibEJhPeir1ncUID16QnEjNpwzNdO3Lm4ywrBpBZ5oLD0I6br9evr1Y9JTqwRtAh7JLoOzAQdVA==",
-      "dev": true,
-      "dependencies": {
-        "isarray": "0.0.1"
-      }
-    },
     "node_modules/performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
@@ -1609,31 +1559,54 @@
       }
     },
     "node_modules/sinon": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-7.5.0.tgz",
-      "integrity": "sha512-AoD0oJWerp0/rY9czP/D6hDTTUYGpObhZjMpd7Cl/A6+j0xBE+ayL/ldfggkBXUs0IkvIiM1ljM8+WkOc5k78Q==",
-      "deprecated": "16.1.1",
+      "version": "21.0.0",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-21.0.0.tgz",
+      "integrity": "sha512-TOgRcwFPbfGtpqvZw+hyqJDvqfapr1qUlOizROIk4bBLjlsjlB00Pg6wMFXNtJRpu+eCZuVOaLatG7M8105kAw==",
       "dev": true,
+      "license": "BSD-3-Clause",
       "dependencies": {
-        "@sinonjs/commons": "^1.4.0",
-        "@sinonjs/formatio": "^3.2.1",
-        "@sinonjs/samsam": "^3.3.3",
-        "diff": "^3.5.0",
-        "lolex": "^4.2.0",
-        "nise": "^1.5.2",
-        "supports-color": "^5.5.0"
+        "@sinonjs/commons": "^3.0.1",
+        "@sinonjs/fake-timers": "^13.0.5",
+        "@sinonjs/samsam": "^8.0.1",
+        "diff": "^7.0.0",
+        "supports-color": "^7.2.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/sinon"
+      }
+    },
+    "node_modules/sinon/node_modules/diff": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-7.0.0.tgz",
+      "integrity": "sha512-PJWHUb1RFevKCwaFA9RlG5tCd+FO5iRh9A8HEtkmBH2Li03iJriB6m6JIN4rGz3K3JLawI7/veA1xzRKP6ISBw==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
+    "node_modules/sinon/node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
       }
     },
     "node_modules/sinon/node_modules/supports-color": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "has-flag": "^3.0.0"
+        "has-flag": "^4.0.0"
       },
       "engines": {
-        "node": ">=4"
+        "node": ">=8"
       }
     },
     "node_modules/sprintf-js": {
@@ -1819,6 +1792,7 @@
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=4"
       }
diff --git a/package.json b/package.json
index 33097ea..c674c3c 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "mocha": "^6.2.0",
     "nock": "^11.9.1",
     "request": "^2.88.2",
-    "sinon": "^7.3.1",
+    "sinon": "^21.0.0",
     "supertest": "^4.0.2"
   },
   "scripts": {