diff --git a/app/core/mmr/utils.ts b/app/core/mmr/utils.ts
index 36671de8b..6b0d4ec17 100644
--- a/app/core/mmr/utils.ts
+++ b/app/core/mmr/utils.ts
@@ -1,5 +1,5 @@
 import clone from "just-clone";
-import { expose, rate, Rating } from "ts-trueskill";
+import { rating, ordinal, rate } from "openskill";
 import { LFG_GROUP_FULL_SIZE, MMR_TOPX_VISIBILITY_CUTOFF } from "~/constants";
 import { PlayFrontPageLoader } from "~/routes/play/index";
 
@@ -17,7 +17,7 @@ export function skillArrayToMMR(
 }
 
 export function muSigmaToSP(skill: { mu: number; sigma: number }) {
-  return toTwoDecimals(expose(new Rating(skill.mu, skill.sigma)) * 10 + 1000);
+  return toTwoDecimals(ordinal(rating(skill)) * 10 + 1000);
 }
 
 interface TeamSkill {
@@ -37,7 +37,7 @@ export function teamSkillToExactMMR(teamSkills: TeamSkill[]) {
     teamSkillsClone.push({ user: { skill: [] } });
   }
 
-  const defaultRating = new Rating();
+  const defaultRating = rating();
   const skillsWithDefaults = teamSkillsClone.reduce((acc: TeamSkill[], cur) => {
     if (cur.user.skill.length === 0) {
       return [
@@ -84,9 +84,9 @@ export function adjustSkills({
 }): AdjustSkill[] {
   const mapToRatings = (id: string) => {
     const skill = skills.find((s) => s.userId === id);
-    if (!skill) return new Rating();
+    if (!skill) return rating();
 
-    return new Rating(skill.mu, skill.sigma);
+    return rating(skill);
   };
   const winningTeam = playerIds.winning.map(mapToRatings);
   const losingTeam = playerIds.losing.map(mapToRatings);
diff --git a/openskill.d.ts b/openskill.d.ts
new file mode 100644
index 000000000..2276acd48
--- /dev/null
+++ b/openskill.d.ts
@@ -0,0 +1,10 @@
+type Rating = {
+  mu: number;
+  sigma: number;
+};
+
+declare module "openskill" {
+  export function rating(rating?: Rating): Rating;
+  export function ordinal(rating: Rating): number;
+  export function rate(ratings: [Rating[], Rating[]]): [Rating[], Rating[]];
+}
diff --git a/package-lock.json b/package-lock.json
index 668734aef..d79acb03d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,6 +27,7 @@
         "just-clone": "^5.0.1",
         "just-shuffle": "^4.0.1",
         "morgan": "^1.10.0",
+        "openskill": "^2.1.0",
         "passport": "^0.5.2",
         "passport-discord": "^0.1.4",
         "react": "^17.0.2",
@@ -36,7 +37,6 @@
         "socket.io": "^4.4.1",
         "socket.io-client": "^4.4.1",
         "tiny-invariant": "^1.2.0",
-        "ts-trueskill": "^3.3.0",
         "uuid": "^8.3.2",
         "zod": "^3.14.2"
       },
@@ -2787,18 +2787,6 @@
         "node": ">=4.0.0"
       }
     },
-    "node_modules/complex.js": {
-      "version": "2.0.15",
-      "resolved": "https://registry.npmjs.org/complex.js/-/complex.js-2.0.15.tgz",
-      "integrity": "sha512-gDBvQU8IG139ZBQTSo2qvDFP+lANMGluM779csXOr6ny1NUtA3wkUnCFjlDNH/moAVfXtvClYt6G0zarFbtz5w==",
-      "engines": {
-        "node": "*"
-      },
-      "funding": {
-        "type": "patreon",
-        "url": "https://www.patreon.com/infusion"
-      }
-    },
     "node_modules/component-emitter": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -3348,11 +3336,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/decimal.js": {
-      "version": "10.3.1",
-      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.3.1.tgz",
-      "integrity": "sha512-V0pfhfr8suzyPGOx3nmq4aHqabehUZn6Ch9kyFpV79TGDTWFmHqUqXdabR7QHqxzrYolF4+tVmJhUG4OURg5dQ=="
-    },
     "node_modules/decode-named-character-reference": {
       "version": "1.0.0",
       "dev": true,
@@ -4214,11 +4197,6 @@
       "version": "1.0.3",
       "license": "MIT"
     },
-    "node_modules/escape-latex": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/escape-latex/-/escape-latex-1.2.0.tgz",
-      "integrity": "sha512-nV5aVWW1K0wEiUIEdZ4erkGGH8mDxGyxSeqPzRNtWP7ataw+/olFObw7hujFWlVjNsaDFw5VZ5NzVSIqRgfTiw=="
-    },
     "node_modules/escape-string-regexp": {
       "version": "1.0.5",
       "dev": true,
@@ -5119,18 +5097,6 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/fraction.js": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/fraction.js/-/fraction.js-4.1.2.tgz",
-      "integrity": "sha512-o2RiJQ6DZaR/5+Si0qJUIy637QMRudSi9kU/FFzx9EZazrIdnBgpU+3sEWCxAVhH2RtxW2Oz+T4p2o8uOPVcgA==",
-      "engines": {
-        "node": "*"
-      },
-      "funding": {
-        "type": "patreon",
-        "url": "https://www.patreon.com/infusion"
-      }
-    },
     "node_modules/fresh": {
       "version": "0.5.2",
       "license": "MIT",
@@ -5203,6 +5169,14 @@
         "node": ">=10"
       }
     },
+    "node_modules/gaussian": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/gaussian/-/gaussian-1.2.0.tgz",
+      "integrity": "sha512-Pz/InFmDZ6VqCbXF+2+O6USIbPUPWhJ7DnqrZKfo9mMHszCd4pBad3WCVa9ruzzrBizYonsv0ZBmuv4rR8NRQg==",
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
@@ -6393,11 +6367,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/javascript-natural-sort": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/javascript-natural-sort/-/javascript-natural-sort-0.7.1.tgz",
-      "integrity": "sha1-+eIwPUUH9tdDVac2ZNFED7Wg71k="
-    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "license": "MIT"
@@ -6966,28 +6935,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/mathjs": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/mathjs/-/mathjs-10.1.0.tgz",
-      "integrity": "sha512-TrpZAR3H9jR0Cv6cnzT+TZhE40Xs2SCaLf/qm2WcWm2tui69Gas/bC/ct5ZLZNWnWvNvJ7H2uHvuRDDl151PHA==",
-      "dependencies": {
-        "@babel/runtime": "^7.16.5",
-        "complex.js": "^2.0.15",
-        "decimal.js": "^10.3.1",
-        "escape-latex": "^1.2.0",
-        "fraction.js": "^4.1.2",
-        "javascript-natural-sort": "^0.7.1",
-        "seedrandom": "^3.0.5",
-        "tiny-emitter": "^2.1.0",
-        "typed-function": "^2.0.0"
-      },
-      "bin": {
-        "mathjs": "bin/cli.js"
-      },
-      "engines": {
-        "node": ">= 12"
-      }
-    },
     "node_modules/mathml-tag-names": {
       "version": "2.1.3",
       "dev": true,
@@ -8516,6 +8463,16 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/openskill": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/openskill/-/openskill-2.1.0.tgz",
+      "integrity": "sha512-ViZXEFF6agXt4I50zJY51iRUpSdcTFCA/Dl8SMznnzvZ+IlnFWjttDA+lK+/C6cRfp9PwuoqfVstGJAMuubE8A==",
+      "dependencies": {
+        "gaussian": "1.2.0",
+        "ramda": "0.28.0",
+        "sort-unwind": "1.0.0"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.1",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
@@ -9400,6 +9357,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/ramda": {
+      "version": "0.28.0",
+      "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.28.0.tgz",
+      "integrity": "sha512-9QnLuG/kPVgWvMQ4aODhsBUFKOUmnbUnsSXACv+NCQZcHbeb+v8Lodp8OVxtRULN1/xOyYLLaL6npE6dMq5QTA==",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/ramda"
+      }
+    },
     "node_modules/range-parser": {
       "version": "1.2.1",
       "license": "MIT",
@@ -9933,11 +9899,6 @@
         "object-assign": "^4.1.1"
       }
     },
-    "node_modules/seedrandom": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/seedrandom/-/seedrandom-3.0.5.tgz",
-      "integrity": "sha512-8OwmbklUNzwezjGInmZ+2clQmExQPvomqjL7LFqOYqtmuxRgQYqOD3mHaU+MvZn5FLUeVxVfQjwLZW/n/JFuqg=="
-    },
     "node_modules/semver": {
       "version": "7.3.5",
       "dev": true,
@@ -10294,6 +10255,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/sort-unwind": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/sort-unwind/-/sort-unwind-1.0.0.tgz",
+      "integrity": "sha512-gmiZzA2UMO16/fV+oiGI3TV++pWBtlyrTmqOsgOSxEAFmud6gzS2SWtxjDHcI/eAxaKFNHj9NwSKnLOBgr/UGw==",
+      "dependencies": {
+        "ramda": "0.27.1"
+      }
+    },
+    "node_modules/sort-unwind/node_modules/ramda": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.27.1.tgz",
+      "integrity": "sha512-PgIdVpn5y5Yns8vqb8FzBUEYn98V3xcPgawAkkgj0YJ0qDsnHCiNmZYfOGMgOvoB0eWFLpYbhxUR3mxfDIMvpw=="
+    },
     "node_modules/source-map": {
       "version": "0.7.3",
       "license": "BSD-3-Clause",
@@ -11069,11 +11043,6 @@
         "safe-buffer": "~5.1.0"
       }
     },
-    "node_modules/tiny-emitter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
-      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q=="
-    },
     "node_modules/tiny-invariant": {
       "version": "1.2.0",
       "license": "MIT"
@@ -11186,14 +11155,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/ts-gaussian": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/ts-gaussian/-/ts-gaussian-2.0.2.tgz",
-      "integrity": "sha512-DdMwQc1bgzRwbKQ3VoiV3aK2isz7CJhOmtO2oA+mp9soGpbN/p2pkBaIrZnJBW3jB293CUARLFmNktcTSHjypQ==",
-      "engines": {
-        "node": ">=10.0.0"
-      }
-    },
     "node_modules/ts-node": {
       "version": "10.7.0",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.7.0.tgz",
@@ -11245,19 +11206,6 @@
         "node": ">=0.3.1"
       }
     },
-    "node_modules/ts-trueskill": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/ts-trueskill/-/ts-trueskill-3.3.0.tgz",
-      "integrity": "sha512-yGZQ9d4xIZg7HBKOnO70Qz//M/roPmw1p6cFFGcCtmWQlU6KMAoVzeScX60N70dD2ZvBxDTXXQFhaWr66zdiYQ==",
-      "dependencies": {
-        "mathjs": "^10.1.0",
-        "ts-gaussian": "^2.0.2",
-        "uuid": "^8.3.2"
-      },
-      "engines": {
-        "node": ">=10.0.0"
-      }
-    },
     "node_modules/tsconfig-paths": {
       "version": "3.14.1",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.14.1.tgz",
@@ -11374,14 +11322,6 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/typed-function": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/typed-function/-/typed-function-2.0.0.tgz",
-      "integrity": "sha512-Hhy1Iwo/e4AtLZNK10ewVVcP2UEs408DS35ubP825w/YgSBK1KVLwALvvIG4yX75QJrxjCpcWkzkVRB0BwwYlA==",
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -14151,11 +14091,6 @@
       "version": "1.8.2",
       "dev": true
     },
-    "complex.js": {
-      "version": "2.0.15",
-      "resolved": "https://registry.npmjs.org/complex.js/-/complex.js-2.0.15.tgz",
-      "integrity": "sha512-gDBvQU8IG139ZBQTSo2qvDFP+lANMGluM779csXOr6ny1NUtA3wkUnCFjlDNH/moAVfXtvClYt6G0zarFbtz5w=="
-    },
     "component-emitter": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
@@ -14534,11 +14469,6 @@
         }
       }
     },
-    "decimal.js": {
-      "version": "10.3.1",
-      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.3.1.tgz",
-      "integrity": "sha512-V0pfhfr8suzyPGOx3nmq4aHqabehUZn6Ch9kyFpV79TGDTWFmHqUqXdabR7QHqxzrYolF4+tVmJhUG4OURg5dQ=="
-    },
     "decode-named-character-reference": {
       "version": "1.0.0",
       "dev": true,
@@ -15084,11 +15014,6 @@
     "escape-html": {
       "version": "1.0.3"
     },
-    "escape-latex": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/escape-latex/-/escape-latex-1.2.0.tgz",
-      "integrity": "sha512-nV5aVWW1K0wEiUIEdZ4erkGGH8mDxGyxSeqPzRNtWP7ataw+/olFObw7hujFWlVjNsaDFw5VZ5NzVSIqRgfTiw=="
-    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "dev": true
@@ -15723,11 +15648,6 @@
     "forwarded": {
       "version": "0.2.0"
     },
-    "fraction.js": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/fraction.js/-/fraction.js-4.1.2.tgz",
-      "integrity": "sha512-o2RiJQ6DZaR/5+Si0qJUIy637QMRudSi9kU/FFzx9EZazrIdnBgpU+3sEWCxAVhH2RtxW2Oz+T4p2o8uOPVcgA=="
-    },
     "fresh": {
       "version": "0.5.2"
     },
@@ -15776,6 +15696,11 @@
       "resolved": "https://registry.npmjs.org/fuse.js/-/fuse.js-6.5.3.tgz",
       "integrity": "sha512-sA5etGE7yD/pOqivZRBvUBd/NaL2sjAu6QuSaFoe1H2BrJSkH/T/UXAJ8CdXdw7DvY3Hs8CXKYkDWX7RiP5KOg=="
     },
+    "gaussian": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/gaussian/-/gaussian-1.2.0.tgz",
+      "integrity": "sha512-Pz/InFmDZ6VqCbXF+2+O6USIbPUPWhJ7DnqrZKfo9mMHszCd4pBad3WCVa9ruzzrBizYonsv0ZBmuv4rR8NRQg=="
+    },
     "get-intrinsic": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
@@ -16526,11 +16451,6 @@
       "version": "0.1.2",
       "dev": true
     },
-    "javascript-natural-sort": {
-      "version": "0.7.1",
-      "resolved": "https://registry.npmjs.org/javascript-natural-sort/-/javascript-natural-sort-0.7.1.tgz",
-      "integrity": "sha1-+eIwPUUH9tdDVac2ZNFED7Wg71k="
-    },
     "js-tokens": {
       "version": "4.0.0"
     },
@@ -16918,22 +16838,6 @@
       "version": "1.1.1",
       "dev": true
     },
-    "mathjs": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/mathjs/-/mathjs-10.1.0.tgz",
-      "integrity": "sha512-TrpZAR3H9jR0Cv6cnzT+TZhE40Xs2SCaLf/qm2WcWm2tui69Gas/bC/ct5ZLZNWnWvNvJ7H2uHvuRDDl151PHA==",
-      "requires": {
-        "@babel/runtime": "^7.16.5",
-        "complex.js": "^2.0.15",
-        "decimal.js": "^10.3.1",
-        "escape-latex": "^1.2.0",
-        "fraction.js": "^4.1.2",
-        "javascript-natural-sort": "^0.7.1",
-        "seedrandom": "^3.0.5",
-        "tiny-emitter": "^2.1.0",
-        "typed-function": "^2.0.0"
-      }
-    },
     "mathml-tag-names": {
       "version": "2.1.3",
       "dev": true
@@ -17859,6 +17763,16 @@
         "mimic-fn": "^2.1.0"
       }
     },
+    "openskill": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/openskill/-/openskill-2.1.0.tgz",
+      "integrity": "sha512-ViZXEFF6agXt4I50zJY51iRUpSdcTFCA/Dl8SMznnzvZ+IlnFWjttDA+lK+/C6cRfp9PwuoqfVstGJAMuubE8A==",
+      "requires": {
+        "gaussian": "1.2.0",
+        "ramda": "0.28.0",
+        "sort-unwind": "1.0.0"
+      }
+    },
     "optionator": {
       "version": "0.9.1",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
@@ -18461,6 +18375,11 @@
       "version": "4.0.1",
       "dev": true
     },
+    "ramda": {
+      "version": "0.28.0",
+      "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.28.0.tgz",
+      "integrity": "sha512-9QnLuG/kPVgWvMQ4aODhsBUFKOUmnbUnsSXACv+NCQZcHbeb+v8Lodp8OVxtRULN1/xOyYLLaL6npE6dMq5QTA=="
+    },
     "range-parser": {
       "version": "1.2.1"
     },
@@ -18850,11 +18769,6 @@
         "object-assign": "^4.1.1"
       }
     },
-    "seedrandom": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/seedrandom/-/seedrandom-3.0.5.tgz",
-      "integrity": "sha512-8OwmbklUNzwezjGInmZ+2clQmExQPvomqjL7LFqOYqtmuxRgQYqOD3mHaU+MvZn5FLUeVxVfQjwLZW/n/JFuqg=="
-    },
     "semver": {
       "version": "7.3.5",
       "dev": true,
@@ -19124,6 +19038,21 @@
         }
       }
     },
+    "sort-unwind": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/sort-unwind/-/sort-unwind-1.0.0.tgz",
+      "integrity": "sha512-gmiZzA2UMO16/fV+oiGI3TV++pWBtlyrTmqOsgOSxEAFmud6gzS2SWtxjDHcI/eAxaKFNHj9NwSKnLOBgr/UGw==",
+      "requires": {
+        "ramda": "0.27.1"
+      },
+      "dependencies": {
+        "ramda": {
+          "version": "0.27.1",
+          "resolved": "https://registry.npmjs.org/ramda/-/ramda-0.27.1.tgz",
+          "integrity": "sha512-PgIdVpn5y5Yns8vqb8FzBUEYn98V3xcPgawAkkgj0YJ0qDsnHCiNmZYfOGMgOvoB0eWFLpYbhxUR3mxfDIMvpw=="
+        }
+      }
+    },
     "source-map": {
       "version": "0.7.3"
     },
@@ -19687,11 +19616,6 @@
         }
       }
     },
-    "tiny-emitter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
-      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q=="
-    },
     "tiny-invariant": {
       "version": "1.2.0"
     },
@@ -19768,11 +19692,6 @@
       "version": "2.0.2",
       "dev": true
     },
-    "ts-gaussian": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/ts-gaussian/-/ts-gaussian-2.0.2.tgz",
-      "integrity": "sha512-DdMwQc1bgzRwbKQ3VoiV3aK2isz7CJhOmtO2oA+mp9soGpbN/p2pkBaIrZnJBW3jB293CUARLFmNktcTSHjypQ=="
-    },
     "ts-node": {
       "version": "10.7.0",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.7.0.tgz",
@@ -19800,16 +19719,6 @@
         }
       }
     },
-    "ts-trueskill": {
-      "version": "3.3.0",
-      "resolved": "https://registry.npmjs.org/ts-trueskill/-/ts-trueskill-3.3.0.tgz",
-      "integrity": "sha512-yGZQ9d4xIZg7HBKOnO70Qz//M/roPmw1p6cFFGcCtmWQlU6KMAoVzeScX60N70dD2ZvBxDTXXQFhaWr66zdiYQ==",
-      "requires": {
-        "mathjs": "^10.1.0",
-        "ts-gaussian": "^2.0.2",
-        "uuid": "^8.3.2"
-      }
-    },
     "tsconfig-paths": {
       "version": "3.14.1",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.14.1.tgz",
@@ -19889,11 +19798,6 @@
         "mime-types": "~2.1.24"
       }
     },
-    "typed-function": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/typed-function/-/typed-function-2.0.0.tgz",
-      "integrity": "sha512-Hhy1Iwo/e4AtLZNK10ewVVcP2UEs408DS35ubP825w/YgSBK1KVLwALvvIG4yX75QJrxjCpcWkzkVRB0BwwYlA=="
-    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
diff --git a/package.json b/package.json
index dce55fd1c..7d53b21aa 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
     "just-clone": "^5.0.1",
     "just-shuffle": "^4.0.1",
     "morgan": "^1.10.0",
+    "openskill": "^2.1.0",
     "passport": "^0.5.2",
     "passport-discord": "^0.1.4",
     "react": "^17.0.2",
@@ -56,7 +57,6 @@
     "socket.io": "^4.4.1",
     "socket.io-client": "^4.4.1",
     "tiny-invariant": "^1.2.0",
-    "ts-trueskill": "^3.3.0",
     "uuid": "^8.3.2",
     "zod": "^3.14.2"
   },