diff --git a/internal/datastore/package.json b/internal/datastore/package.json
index 157d5cd2..d95734a7 100644
--- a/internal/datastore/package.json
+++ b/internal/datastore/package.json
@@ -7,7 +7,7 @@
     "zod": "^4.1.11"
   },
   "devDependencies": {
-    "@stylistic/eslint-plugin": "^3.1.0",
+    "@stylistic/eslint-plugin": "^5.6.1",
     "@tsconfig/node22": "^22.0.2",
     "@types/jest": "^30.0.0",
     "@typescript-eslint/eslint-plugin": "^8.46.2",
diff --git a/internal/events/package.json b/internal/events/package.json
index cd87efce..00a90281 100644
--- a/internal/events/package.json
+++ b/internal/events/package.json
@@ -6,7 +6,7 @@
   "description": "Schemas for NHS Notify Supplier API events",
   "devDependencies": {
     "@stoplight/spectral-cli": "^6.15.0",
-    "@stylistic/eslint-plugin": "^3.1.0",
+    "@stylistic/eslint-plugin": "^5.6.1",
     "@tsconfig/node22": "^22.0.2",
     "@types/jest": "^29.5.14",
     "@typescript-eslint/eslint-plugin": "^8.27.0",
diff --git a/internal/helpers/package.json b/internal/helpers/package.json
index bc1f16ac..a52ddc4f 100644
--- a/internal/helpers/package.json
+++ b/internal/helpers/package.json
@@ -4,7 +4,7 @@
   },
   "description": "Common helper utilities for NHS Notify Supplier API",
   "devDependencies": {
-    "@stylistic/eslint-plugin": "^3.1.0",
+    "@stylistic/eslint-plugin": "^5.6.1",
     "@tsconfig/node22": "^22.0.2",
     "@types/jest": "^29.5.14",
     "@typescript-eslint/eslint-plugin": "^8.27.0",
diff --git a/package-lock.json b/package-lock.json
index ff2fedac..0c7178c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -81,7 +81,7 @@
         "zod": "^4.1.11"
       },
       "devDependencies": {
-        "@stylistic/eslint-plugin": "^3.1.0",
+        "@stylistic/eslint-plugin": "^5.6.1",
         "@tsconfig/node22": "^22.0.2",
         "@types/jest": "^30.0.0",
         "@typescript-eslint/eslint-plugin": "^8.46.2",
@@ -97,9 +97,57 @@
         "zod-mermaid": "^1.0.9"
       }
     },
+    "internal/datastore/node_modules/@stylistic/eslint-plugin": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.6.1.tgz",
+      "integrity": "sha512-JCs+MqoXfXrRPGbGmho/zGS/jMcn3ieKl/A8YImqib76C8kjgZwq5uUFzc30lJkMvcchuRn6/v8IApLxli3Jyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/eslint-utils": "^4.9.0",
+        "@typescript-eslint/types": "^8.47.0",
+        "eslint-visitor-keys": "^4.2.1",
+        "espree": "^10.4.0",
+        "estraverse": "^5.3.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "peerDependencies": {
+        "eslint": ">=9.0.0"
+      }
+    },
+    "internal/datastore/node_modules/@typescript-eslint/types": {
+      "version": "8.47.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.47.0.tgz",
+      "integrity": "sha512-nHAE6bMKsizhA2uuYZbEbmp5z2UpffNrPEqiKIeN7VsV6UY/roxanWfoRrf6x/k9+Obf+GQdkm0nPU+vnMXo9A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "internal/datastore/node_modules/eslint-visitor-keys": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
     "internal/events": {
       "name": "@nhsdigital/nhs-notify-event-schemas-supplier-api",
-      "version": "1.0.1",
+      "version": "1.0.2",
       "license": "MIT",
       "dependencies": {
         "@asyncapi/bundler": "^0.6.4",
@@ -107,7 +155,7 @@
       },
       "devDependencies": {
         "@stoplight/spectral-cli": "^6.15.0",
-        "@stylistic/eslint-plugin": "^3.1.0",
+        "@stylistic/eslint-plugin": "^5.6.1",
         "@tsconfig/node22": "^22.0.2",
         "@types/jest": "^29.5.14",
         "@typescript-eslint/eslint-plugin": "^8.27.0",
@@ -373,6 +421,27 @@
         "@sinonjs/commons": "^3.0.0"
       }
     },
+    "internal/events/node_modules/@stylistic/eslint-plugin": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.6.1.tgz",
+      "integrity": "sha512-JCs+MqoXfXrRPGbGmho/zGS/jMcn3ieKl/A8YImqib76C8kjgZwq5uUFzc30lJkMvcchuRn6/v8IApLxli3Jyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/eslint-utils": "^4.9.0",
+        "@typescript-eslint/types": "^8.47.0",
+        "eslint-visitor-keys": "^4.2.1",
+        "espree": "^10.4.0",
+        "estraverse": "^5.3.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "peerDependencies": {
+        "eslint": ">=9.0.0"
+      }
+    },
     "internal/events/node_modules/@types/jest": {
       "version": "29.5.14",
       "dev": true,
@@ -382,6 +451,20 @@
         "pretty-format": "^29.0.0"
       }
     },
+    "internal/events/node_modules/@typescript-eslint/types": {
+      "version": "8.47.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.47.0.tgz",
+      "integrity": "sha512-nHAE6bMKsizhA2uuYZbEbmp5z2UpffNrPEqiKIeN7VsV6UY/roxanWfoRrf6x/k9+Obf+GQdkm0nPU+vnMXo9A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "internal/events/node_modules/babel-plugin-istanbul": {
       "version": "6.1.1",
       "dev": true,
@@ -472,6 +555,19 @@
         "node": ">=12"
       }
     },
+    "internal/events/node_modules/eslint-visitor-keys": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
     "internal/events/node_modules/expect": {
       "version": "29.7.0",
       "resolved": "https://registry.npmjs.org/expect/-/expect-29.7.0.tgz",
@@ -960,7 +1056,7 @@
         "zod": "^4.1.11"
       },
       "devDependencies": {
-        "@stylistic/eslint-plugin": "^3.1.0",
+        "@stylistic/eslint-plugin": "^5.6.1",
         "@tsconfig/node22": "^22.0.2",
         "@types/jest": "^29.5.14",
         "@typescript-eslint/eslint-plugin": "^8.27.0",
@@ -973,6 +1069,27 @@
         "typescript": "^5.9.3"
       }
     },
+    "internal/helpers/node_modules/@stylistic/eslint-plugin": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.6.1.tgz",
+      "integrity": "sha512-JCs+MqoXfXrRPGbGmho/zGS/jMcn3ieKl/A8YImqib76C8kjgZwq5uUFzc30lJkMvcchuRn6/v8IApLxli3Jyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/eslint-utils": "^4.9.0",
+        "@typescript-eslint/types": "^8.47.0",
+        "eslint-visitor-keys": "^4.2.1",
+        "espree": "^10.4.0",
+        "estraverse": "^5.3.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "peerDependencies": {
+        "eslint": ">=9.0.0"
+      }
+    },
     "internal/helpers/node_modules/@types/jest": {
       "version": "29.5.14",
       "dev": true,
@@ -982,6 +1099,33 @@
         "pretty-format": "^29.0.0"
       }
     },
+    "internal/helpers/node_modules/@typescript-eslint/types": {
+      "version": "8.47.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.47.0.tgz",
+      "integrity": "sha512-nHAE6bMKsizhA2uuYZbEbmp5z2UpffNrPEqiKIeN7VsV6UY/roxanWfoRrf6x/k9+Obf+GQdkm0nPU+vnMXo9A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "internal/helpers/node_modules/eslint-visitor-keys": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
     "internal/helpers/node_modules/expect": {
       "version": "29.7.0",
       "resolved": "https://registry.npmjs.org/expect/-/expect-29.7.0.tgz",
@@ -9644,6 +9788,8 @@
       "integrity": "sha512-pA6VOrOqk0+S8toJYhQGv2MWpQQR0QpeUo9AhNkC49Y26nxBQ/nH1rta9bUU1rPw2fJ1zZEMV5oCX5AazT7J2g==",
       "dev": true,
       "license": "MIT",
+      "optional": true,
+      "peer": true,
       "dependencies": {
         "@typescript-eslint/utils": "^8.13.0",
         "eslint-visitor-keys": "^4.2.0",
@@ -9664,6 +9810,8 @@
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       "dev": true,
       "license": "Apache-2.0",
+      "optional": true,
+      "peer": true,
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },