diff --git a/src/data/controllers/CoinflipController.ts b/src/data/controllers/CoinflipController.ts
index a77f821..bc240b3 100644
--- a/src/data/controllers/CoinflipController.ts
+++ b/src/data/controllers/CoinflipController.ts
@@ -37,7 +37,7 @@ export default class CoinflipController {
   public static async postCoinflip(req: Request, res: Response): Promise<Response> {
     const { winnerId, loserId, betValue } = req.body;
 
-    if (!winnerId || !loserId || !betValue) return res.sendStatus(400);
+    if (!winnerId || !loserId || typeof betValue !== 'number') return res.sendStatus(400);
 
     await postCoinflip(winnerId, loserId, betValue);
 
diff --git a/yarn.lock b/yarn.lock
index 23e37ad..9e2acf0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1485,9 +1485,9 @@ js-tokens@^4.0.0:
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
 js-yaml@^3.13.1:
-  version "3.14.2"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.14.2.tgz#77485ce1dd7f33c061fd1b16ecea23b55fcb04b0"
-  integrity sha512-PMSmkqxr106Xa156c2M265Z+FTrPl+oxd/rgOQy2tijQeK5TxQ43psO1ZCwhVOSdnn+RzkzlRz/eY4BgJBYVpg==
+  version "3.15.0"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.15.0.tgz#586e5214eafe3e893756a41e979b50d89d3e4a67"
+  integrity sha512-ttBQIIQPDeLjpPOohtUdXuXUVoA2uIB6fEH9HyJ7234s5mBJ5wTx20njxplLZQgLaOfpmPQA7X2t5AX6tIPbog==
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"
@@ -1546,9 +1546,9 @@ lodash.isarguments@^3.1.0:
   integrity sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg==
 
 lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19:
-  version "4.17.23"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.23.tgz#f113b0378386103be4f6893388c73d0bde7f2c5a"
-  integrity sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==
+  version "4.18.1"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.18.1.tgz#ff2b66c1f6326d59513de2407bf881439812771c"
+  integrity sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==
 
 lru-cache@^6.0.0:
   version "6.0.0"
@@ -1821,9 +1821,9 @@ path-type@^4.0.0:
   integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
 
 picomatch@^2.0.4, picomatch@^2.2.1, picomatch@^2.3.1:
-  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.1.tgz#3ba3833733646d9d3e4995946c1365a67fb07a42"
-  integrity sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.2.tgz#5a942915e26b372dc0f0e6753149a16e6b1c5601"
+  integrity sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==
 
 pify@^2.0.0:
   version "2.3.0"