diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8736db8..edc019d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.10] - 2026-04-18
+
+### Changed
+- Upgraded Express 4 → 5 (`^5.2.1`): modernised wildcard SPA fallback route from `'*'` to `'/{*path}'` for compatibility with path-to-regexp v8; all other Express APIs in the codebase were already Express 5 compatible (closes #54)
+
 ## [0.20.9] - 2026-04-18
 
 ### Added
diff --git a/package-lock.json b/package-lock.json
index cb64c2e..4f2669b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,18 +1,18 @@
 {
   "name": "oikos",
-  "version": "0.20.8",
+  "version": "0.20.9",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "oikos",
-      "version": "0.20.8",
+      "version": "0.20.9",
       "license": "MIT",
       "dependencies": {
         "bcrypt": "^6.0.0",
         "better-sqlite3": "^12.9.0",
         "dotenv": "^17.4.2",
-        "express": "^4.21.2",
+        "express": "^5.2.1",
         "express-rate-limit": "^8.3.2",
         "express-session": "^1.19.0",
         "helmet": "^8.1.0",
@@ -531,13 +531,12 @@
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-      "license": "MIT",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
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       "dependencies": {
-        "mime-types": "~2.1.34",
-        "negotiator": "0.6.3"
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
       },
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         "node": ">= 0.6"
@@ -552,12 +551,6 @@
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@@ -642,29 +635,49 @@
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-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
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-      "license": "MIT",
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-        "qs": "~6.14.0",
-        "raw-body": "~2.5.3",
-        "type-is": "~1.6.18",
-        "unpipe": "~1.0.0"
+        "bytes": "^3.1.2",
+        "content-type": "^1.0.5",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.0",
+        "iconv-lite": "^0.7.0",
+        "on-finished": "^2.4.1",
+        "qs": "^6.14.1",
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-        "npm": "1.2.8000 || >= 1.4.16"
+        "node": ">=18"
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+        "url": "https://opencollective.com/express"
       }
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+      "dependencies": {
+        "ms": "^2.1.3"
+      },
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+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
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+    },
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@@ -734,22 +746,21 @@
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-      "license": "MIT",
-      "dependencies": {
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       "engines": {
-        "node": ">= 0.6"
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/content-type": {
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       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
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@@ -851,16 +862,6 @@
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-      "license": "MIT"
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@@ -986,14 +985,12 @@
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-      "license": "MIT"
+      "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow=="
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@@ -1008,45 +1005,41 @@
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-        "body-parser": "~1.20.3",
-        "content-disposition": "~0.5.4",
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-        "utils-merge": "1.0.1",
-        "vary": "~1.1.2"
+        "accepts": "^2.0.0",
+        "body-parser": "^2.2.1",
+        "content-disposition": "^1.0.0",
+        "content-type": "^1.0.5",
+        "cookie": "^0.7.1",
+        "cookie-signature": "^1.2.1",
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "finalhandler": "^2.1.0",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.0",
+        "merge-descriptors": "^2.0.0",
+        "mime-types": "^3.0.0",
+        "on-finished": "^2.4.1",
+        "once": "^1.4.0",
+        "parseurl": "^1.3.3",
+        "proxy-addr": "^2.0.7",
+        "qs": "^6.14.0",
+        "range-parser": "^1.2.1",
+        "router": "^2.2.0",
+        "send": "^1.1.0",
+        "serve-static": "^2.2.0",
+        "statuses": "^2.0.1",
+        "type-is": "^2.0.1",
+        "vary": "^1.1.2"
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+        "node": ">= 18"
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       "funding": {
         "type": "opencollective",
@@ -1093,6 +1086,35 @@
         "url": "https://opencollective.com/express"
       }
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+        "node": ">=6.6.0"
+      }
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+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
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+      "dependencies": {
+        "ms": "^2.1.3"
+      },
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+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
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+    },
+    "node_modules/express/node_modules/ms": {
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+    },
     "node_modules/extend": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
@@ -1129,23 +1151,46 @@
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-      "license": "MIT",
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+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-2.1.1.tgz",
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-        "on-finished": "~2.4.1",
-        "parseurl": "~1.3.3",
-        "statuses": "~2.0.2",
-        "unpipe": "~1.0.0"
+        "debug": "^4.4.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "on-finished": "^2.4.1",
+        "parseurl": "^1.3.3",
+        "statuses": "^2.0.1"
       },
       "engines": {
-        "node": ">= 0.8"
+        "node": ">= 18.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
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+    "node_modules/finalhandler/node_modules/debug": {
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+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
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+      },
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+      },
+      "peerDependenciesMeta": {
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-      "license": "MIT",
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-        "safer-buffer": ">= 2.1.2 < 3"
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
       },
       "engines": {
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+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
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@@ -1479,6 +1525,11 @@
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+    "node_modules/is-promise": {
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+        "mime-db": "^1.54.0"
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-        "node": ">= 0.6"
+        "node": ">=18"
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       }
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+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
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-      "license": "MIT",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-3.0.2.tgz",
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         "bytes": "~3.1.2",
         "http-errors": "~2.0.1",
-        "iconv-lite": "~0.4.24",
+        "iconv-lite": "~0.7.0",
         "unpipe": "~1.0.0"
       },
       "engines": {
-        "node": ">= 0.8"
+        "node": ">= 0.10"
       }
     },
     "node_modules/rc": {
@@ -1880,6 +1912,42 @@
         "node": ">= 6"
       }
     },
+    "node_modules/router": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
+      "integrity": "sha512-nLTrUKm2UyiL7rlhapu/Zl45FwNgkZGaCpZbIHajDYgwlJCOzLSk+cIPAnsEqV955GjILJnKbdQC1nVPz+gAYQ==",
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+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "is-promise": "^4.0.0",
+        "parseurl": "^1.3.3",
+        "path-to-regexp": "^8.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
+    "node_modules/router/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
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+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/router/node_modules/ms": {
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+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
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+    },
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@@ -1929,55 +1997,73 @@
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-        "encodeurl": "~2.0.0",
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-        "etag": "~1.8.1",
-        "fresh": "~0.5.2",
-        "http-errors": "~2.0.1",
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-        "ms": "2.1.3",
-        "on-finished": "~2.4.1",
-        "range-parser": "~1.2.1",
-        "statuses": "~2.0.2"
+        "debug": "^4.4.3",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.1",
+        "mime-types": "^3.0.2",
+        "ms": "^2.1.3",
+        "on-finished": "^2.4.1",
+        "range-parser": "^1.2.1",
+        "statuses": "^2.0.2"
       },
       "engines": {
-        "node": ">= 0.8.0"
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/send/node_modules/debug": {
+      "version": "4.4.3",
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-      "license": "MIT",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-2.2.1.tgz",
+      "integrity": "sha512-xRXBn0pPqQTVQiC8wyQrKs2MOlX24zQ0POGaj0kultvoOCstBQM5yvOhAVSUwOMjQtTvsPWoNCHfPGwaaQJhTw==",
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-        "encodeurl": "~2.0.0",
-        "escape-html": "~1.0.3",
-        "parseurl": "~1.3.3",
-        "send": "~0.19.1"
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "parseurl": "^1.3.3",
+        "send": "^1.2.0"
       },
       "engines": {
-        "node": ">= 0.8.0"
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
       }
     },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
-      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
-      "license": "ISC"
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw=="
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@@ -2145,7 +2231,6 @@
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-      "license": "MIT",
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@@ -2206,7 +2291,6 @@
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-      "license": "MIT",
       "engines": {
         "node": ">=0.6"
       }
@@ -2280,13 +2364,13 @@
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     "node_modules/type-is": {
-      "version": "1.6.18",
-      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
-      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
-      "license": "MIT",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
       "dependencies": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
+        "content-type": "^1.0.5",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
       },
       "engines": {
         "node": ">= 0.6"
@@ -2308,7 +2392,6 @@
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-      "license": "MIT",
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       }
@@ -2325,15 +2408,6 @@
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       "license": "MIT"
     },
-    "node_modules/utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4.0"
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       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
diff --git a/package.json b/package.json
index d007acc..0930f82 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "oikos",
-  "version": "0.20.9",
+  "version": "0.20.10",
   "description": "Self-hosted family planner - calendar, tasks, shopping, meal planning, budget and more. Private, open-source, no subscription.",
   "main": "server/index.js",
   "type": "module",
@@ -27,7 +27,7 @@
     "bcrypt": "^6.0.0",
     "better-sqlite3": "^12.9.0",
     "dotenv": "^17.4.2",
-    "express": "^4.21.2",
+    "express": "^5.2.1",
     "express-rate-limit": "^8.3.2",
     "express-session": "^1.19.0",
     "helmet": "^8.1.0",
diff --git a/server/index.js b/server/index.js
index b971b17..4cce3df 100644
--- a/server/index.js
+++ b/server/index.js
@@ -189,7 +189,7 @@ const spaLimiter = rateLimit({
 // --------------------------------------------------------
 // SPA Fallback: Alle nicht-API-Routen → index.html
 // --------------------------------------------------------
-app.get('*', spaLimiter, (req, res) => {
+app.get('/{*path}', spaLimiter, (req, res) => {
   if (req.path.startsWith('/api/')) {
     return res.status(404).json({ error: 'Nicht gefunden.', code: 404 });
   }