diff --git a/package-lock.json b/package-lock.json
index e16af98..dbd7906 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,7 @@
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                 "@dotcom-tool-kit/mocha": "^3.2.0",
                 "@financial-times/eslint-config-next": "^7.1.0",
-                "chai": "^3.5.0",
+                "chai": "^5.1.2",
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                 "dotcom-tool-kit": "^3.4.0",
                 "eslint": "^7.32.0",
@@ -1227,12 +1227,12 @@
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+            "version": "2.0.1",
+            "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
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             "dev": true,
             "engines": {
-                "node": "*"
+                "node": ">=12"
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@@ -1473,17 +1473,19 @@
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-            "resolved": "https://registry.npmjs.org/chai/-/chai-3.5.0.tgz",
-            "integrity": "sha1-TQJjewZ/6Vi9v906QOxW/vc3Mkc=",
+            "version": "5.1.2",
+            "resolved": "https://registry.npmjs.org/chai/-/chai-5.1.2.tgz",
+            "integrity": "sha512-aGtmf24DW6MLHHG5gCx4zaI3uBq3KRtxeVs0DjFH6Z0rDNbsvTxFASFvdj79pxjxZ8/5u3PIiN3IwEIQkiiuPw==",
             "dev": true,
             "dependencies": {
-                "assertion-error": "^1.0.1",
-                "deep-eql": "^0.1.3",
-                "type-detect": "^1.0.0"
+                "assertion-error": "^2.0.1",
+                "check-error": "^2.1.1",
+                "deep-eql": "^5.0.1",
+                "loupe": "^3.1.0",
+                "pathval": "^2.0.0"
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-                "node": ">= 0.4.0"
+                "node": ">=12"
             }
         },
         "node_modules/chalk": {
@@ -1538,6 +1540,15 @@
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+        "node_modules/check-error": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/check-error/-/check-error-2.1.1.tgz",
+            "integrity": "sha512-OAlb+T7V4Op9OwdkjmguYRqncdlx5JiofwOAUkmTF+jNdHwzTaTs4sRAGpzLF3oOz5xAyDGrPgeIDFQmDOTiJw==",
+            "dev": true,
+            "engines": {
+                "node": ">= 16"
+            }
+        },
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@@ -1892,24 +1903,12 @@
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-            "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-0.1.3.tgz",
-            "integrity": "sha1-71WKyrjeJSBs1xOQbXTlaTDrafI=",
+            "version": "5.0.2",
+            "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-5.0.2.tgz",
+            "integrity": "sha512-h5k/5U50IJJFpzfL6nO9jaaumfjO/f2NjK/oYB2Djzm4p9L+3T9qWpZqZ2hAbLPuuYq9wrU08WQyBTL5GbPk5Q==",
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-            },
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-        "node_modules/deep-eql/node_modules/type-detect": {
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-            "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-0.1.1.tgz",
-            "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
-            "dev": true,
-            "engines": {
-                "node": "*"
+                "node": ">=6"
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@@ -4223,6 +4222,12 @@
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             "dev": true
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+        "node_modules/loupe": {
+            "version": "3.1.2",
+            "resolved": "https://registry.npmjs.org/loupe/-/loupe-3.1.2.tgz",
+            "integrity": "sha512-23I4pFZHmAemUnz8WZXbYRSKYj801VDaNv9ETuMh7IrMc7VuVVSo+Z9iLE3ni30+U48iDWfi30d3twAXBYmnCg==",
+            "dev": true
+        },
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             "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
@@ -5755,6 +5760,15 @@
                 "node": ">=8"
             }
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+        "node_modules/pathval": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/pathval/-/pathval-2.0.0.tgz",
+            "integrity": "sha512-vE7JKRyES09KiunauX7nd2Q9/L7lhok4smP9RZTDeD4MVs72Dp2qNFVz39Nz5a0FVEW0BJR6C0DYrq6unoziZA==",
+            "dev": true,
+            "engines": {
+                "node": ">= 14.16"
+            }
+        },
         "node_modules/pino": {
             "version": "8.15.0",
             "resolved": "https://registry.npmjs.org/pino/-/pino-8.15.0.tgz",
@@ -6943,15 +6957,6 @@
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-            "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-1.0.0.tgz",
-            "integrity": "sha1-diIXzAbbJY7EiQihKY6LlRIejqI=",
-            "dev": true,
-            "engines": {
-                "node": "*"
-            }
-        },
         "node_modules/type-fest": {
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             "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-3.13.1.tgz",
@@ -8611,9 +8616,9 @@
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-            "version": "1.1.0",
-            "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
-            "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+            "version": "2.0.1",
+            "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
+            "integrity": "sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==",
             "dev": true
         },
         "astral-regex": {
@@ -8796,14 +8801,16 @@
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         "chai": {
-            "version": "3.5.0",
-            "resolved": "https://registry.npmjs.org/chai/-/chai-3.5.0.tgz",
-            "integrity": "sha1-TQJjewZ/6Vi9v906QOxW/vc3Mkc=",
+            "version": "5.1.2",
+            "resolved": "https://registry.npmjs.org/chai/-/chai-5.1.2.tgz",
+            "integrity": "sha512-aGtmf24DW6MLHHG5gCx4zaI3uBq3KRtxeVs0DjFH6Z0rDNbsvTxFASFvdj79pxjxZ8/5u3PIiN3IwEIQkiiuPw==",
             "dev": true,
             "requires": {
-                "assertion-error": "^1.0.1",
-                "deep-eql": "^0.1.3",
-                "type-detect": "^1.0.0"
+                "assertion-error": "^2.0.1",
+                "check-error": "^2.1.1",
+                "deep-eql": "^5.0.1",
+                "loupe": "^3.1.0",
+                "pathval": "^2.0.0"
             }
         },
         "chalk": {
@@ -8847,6 +8854,12 @@
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             }
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+        "check-error": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/check-error/-/check-error-2.1.1.tgz",
+            "integrity": "sha512-OAlb+T7V4Op9OwdkjmguYRqncdlx5JiofwOAUkmTF+jNdHwzTaTs4sRAGpzLF3oOz5xAyDGrPgeIDFQmDOTiJw==",
+            "dev": true
+        },
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             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
@@ -9116,21 +9129,10 @@
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-            "version": "0.1.3",
-            "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-0.1.3.tgz",
-            "integrity": "sha1-71WKyrjeJSBs1xOQbXTlaTDrafI=",
-            "dev": true,
-            "requires": {
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-            },
-            "dependencies": {
-                "type-detect": {
-                    "version": "0.1.1",
-                    "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-0.1.1.tgz",
-                    "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
-                    "dev": true
-                }
-            }
+            "version": "5.0.2",
+            "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-5.0.2.tgz",
+            "integrity": "sha512-h5k/5U50IJJFpzfL6nO9jaaumfjO/f2NjK/oYB2Djzm4p9L+3T9qWpZqZ2hAbLPuuYq9wrU08WQyBTL5GbPk5Q==",
+            "dev": true
         },
         "deep-extend": {
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@@ -10908,6 +10910,12 @@
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             "dev": true
         },
+        "loupe": {
+            "version": "3.1.2",
+            "resolved": "https://registry.npmjs.org/loupe/-/loupe-3.1.2.tgz",
+            "integrity": "sha512-23I4pFZHmAemUnz8WZXbYRSKYj801VDaNv9ETuMh7IrMc7VuVVSo+Z9iLE3ni30+U48iDWfi30d3twAXBYmnCg==",
+            "dev": true
+        },
         "lru-cache": {
             "version": "4.1.5",
             "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.5.tgz",
@@ -12117,6 +12125,12 @@
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             "dev": true
         },
+        "pathval": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/pathval/-/pathval-2.0.0.tgz",
+            "integrity": "sha512-vE7JKRyES09KiunauX7nd2Q9/L7lhok4smP9RZTDeD4MVs72Dp2qNFVz39Nz5a0FVEW0BJR6C0DYrq6unoziZA==",
+            "dev": true
+        },
         "pino": {
             "version": "8.15.0",
             "resolved": "https://registry.npmjs.org/pino/-/pino-8.15.0.tgz",
@@ -13012,12 +13026,6 @@
                 "prelude-ls": "~1.1.2"
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-        "type-detect": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-1.0.0.tgz",
-            "integrity": "sha1-diIXzAbbJY7EiQihKY6LlRIejqI=",
-            "dev": true
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         "type-fest": {
             "version": "3.13.1",
             "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-3.13.1.tgz",
diff --git a/package.json b/package.json
index 42b5ece..ac8b7a4 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
         "denodeify": "^1.2.1"
     },
     "devDependencies": {
-        "chai": "^3.5.0",
+        "chai": "^5.1.2",
         "check-engine": "^1.14.0",
         "eslint": "^7.32.0",
         "istanbul": "^0.4.2",