diff --git a/package.json b/package.json
index 953d39d..0cfa9cc 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "dbup": "cd dev/db && docker-compose up -d",
     "test": "cross-env MB_ENV_FILE=dev/test.env yarn jest --runInBand --no-cache --forceExit --detectOpenHandles",
     "tdd": "cross-env MB_ENV_FILE=dev/test.env yarn jest --runInBand --no-cache --forceExit --detectOpenHandles --watchAll",
-    "knex": "cross-env MB_ENV_FILE=dev/dev.env knex --knexfile=./dev/db/dev.knexfile.ts",
+    "knex": "cross-env MB_ENV_FILE=dev/dev.env MB_ENV_FILE_OVR=dev-overrides.env knex --knexfile=./dev/db/dev.knexfile.ts",
     "knex:prod": "cross-env MB_ENV_FILE=/etc/mintbean-v4/config/prod.env knex --knexfile /etc/mintbean-v4/config/prod.env",
     "knex:test": "cross-env MB_ENV_FILE=dev/test.env knex --knexfile ./dev/test/test.knexfile.ts",
     "pristine": "yarn knex migrate:latest && yarn knex seed:run && yarn knex:test migrate:latest && yarn knex:test seed:run",
diff --git a/src/configProvider.ts b/src/configProvider.ts
index 53feba8..0b991ac 100644
--- a/src/configProvider.ts
+++ b/src/configProvider.ts
@@ -1,6 +1,7 @@
 import { config, parse } from "dotenv";
-import fs from 'fs';
+import fs from "fs";
 import path from "path";
+import * as yup from 'yup';
 
 type Mapper<T> = (x: string) => T;
 const defaultMapper: Mapper<string> = (x) => x;
@@ -16,49 +17,55 @@ function getConfig(key: string, mapper = defaultMapper): any {
   }
 }
 
-interface ConfigInstance {
-  MB_KNEXFILE: string;
-  MB_SESSION_KEY: string;
-  MB_ENABLE_GRAPHQL_LOGGER: boolean;
-  MB_ENABLE_GRAPHIQL: boolean;
-  MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE: number;
-  SENDGRID_KEY: string;
-  SENDGRID_PRINT_ONLY: boolean;
-  PORT: string;
-}
-let instance: ConfigInstance;
+const instanceSchema = yup.object().shape({
+  MB_KNEXFILE: yup.string().required(),
+  MB_SESSION_KEY: yup.string().required(),
+  MB_ENABLE_GRAPHQL_LOGGER: yup.bool().required(),
+  MB_ENABLE_GRAPHIQL: yup.bool().required(),
+  MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE: yup.number().required(),
+  SENDGRID_KEY: yup.string().required(),
+  SENDGRID_PRINT_ONLY: yup.bool().required(),
+  PORT: yup.number().required(),
+}).required();
+
+let instance : yup.InferType<typeof instanceSchema>;
 
 export default () => {
   if (!instance) {
+    const envFilePath = getConfig(`MB_ENV_FILE`);
+
+    const overrideEnvFilePath = getConfig(`MB_ENV_FILE_OVR`);
 
-    const envFilePath = getConfig("MB_ENV_FILE");
-    
-    const overrideEnvFilePath = getConfig("MB_ENV_FILE_OVR");
-    
     config({
       path: path.join(__dirname, `..`, envFilePath),
     });
 
     // checks to see if the dev-overrides.env file is present in root directory
-    if(fs.existsSync(path.join(__dirname, "..", overrideEnvFilePath))) {
+    if (fs.existsSync(path.join(__dirname, `..`, overrideEnvFilePath))) {
       // override
-      const envConfig = parse(fs.readFileSync(path.join(__dirname, "..", overrideEnvFilePath)));
+      const envConfig = parse(fs.readFileSync(path.join(__dirname, `..`, overrideEnvFilePath)));
 
-      for(const key in envConfig) {
+      for (const key in envConfig) {
         process.env[key] = envConfig[key];
       }
     }
     
-    instance = {
-      MB_KNEXFILE: getConfig("MB_KNEXFILE"),
-      MB_SESSION_KEY: getConfig("MB_SESSION_KEY"),
-      SENDGRID_KEY: getConfig("SENDGRID_KEY"),
-      MB_ENABLE_GRAPHQL_LOGGER: getConfig("MB_ENABLE_GRAPHQL_LOGGER", (val) => val === "true"),
-      MB_ENABLE_GRAPHIQL: getConfig("MB_ENABLE_GRAPHIQL", (val) => val === "true"),
-      SENDGRID_PRINT_ONLY: getConfig("SENDGRID_PRINT_ONLY", (val) => val === "true"),
-      MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE: getConfig("MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE", (val) => +val),
-      PORT: getConfig("PORT"),
-    };
+    instance = instanceSchema.cast({
+      MB_KNEXFILE: getConfig(`MB_KNEXFILE`),
+      MB_SESSION_KEY: getConfig(`MB_SESSION_KEY`),
+      SENDGRID_KEY: getConfig(`SENDGRID_KEY`),
+      MB_ENABLE_GRAPHQL_LOGGER: getConfig(`MB_ENABLE_GRAPHQL_LOGGER`),
+      MB_ENABLE_GRAPHIQL: getConfig(`MB_ENABLE_GRAPHIQL`),
+      SENDGRID_PRINT_ONLY: getConfig(`SENDGRID_PRINT_ONLY`),
+      MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE: getConfig(`MB_FORGOT_PASSWORD_TOKEN_DAYS_TO_LIVE`),
+      PORT: getConfig(`PORT`),
+    });
+
+    try {
+      instanceSchema.validate(instance);
+    } catch (err) {
+      console.error(err.errors);
+    }
   }
 
   return instance;
diff --git a/src/frontend/src/layouts/Toasts.jsx b/src/frontend/src/layouts/Toasts.jsx
index 2de128b..d29d6fb 100644
--- a/src/frontend/src/layouts/Toasts.jsx
+++ b/src/frontend/src/layouts/Toasts.jsx
@@ -20,8 +20,6 @@ const countdownStyle = css`
   animation-fill-mode: forwards;
 `;
 
-import Card, { CardBody, CardHeader, CardHeaderAction } from "../elements/Card";
-
 const ToastCard = styled(Card)`
   height: 6em;
   padding-top: 0;
diff --git a/yarn.lock b/yarn.lock
index e193daf..20401a0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1399,8 +1399,7 @@
   dependencies:
     regenerator-runtime "^0.13.4"
 
-
-"@babel/runtime@^7.14.6":
+"@babel/runtime@^7.14.6", "@babel/runtime@^7.5.5", "@babel/runtime@^7.8.7":
   version "7.14.6"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.14.6.tgz#535203bc0892efc7dec60bdc27b2ecf6e409062d"
   integrity sha512-/PCB2uJ7oM44tz8YhC4Z/6PeOKXp4K588f+5M3clr1M4zbqztlo0XEfJ2LEzj/FgwfgGcIdl8n7YYjTCI0BYwg==