diff --git a/frontend/package.json b/frontend/package.json
index 45623e467..895f1afa1 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -29,7 +29,7 @@
     "@emotion/react": "^11.11.1",
     "@emotion/server": "^11.11.0",
     "@emotion/styled": "^11.11.0",
-    "@hookform/resolvers": "^3.1.0",
+    "@hookform/resolvers": "^3.3.4",
     "@mui/icons-material": "^5.14.13",
     "@mui/lab": "^5.0.0-alpha.148",
     "@mui/material": "^5.14.13",
diff --git a/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/BookingSemesterForm.tsx b/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/BookingSemesterForm.tsx
index 092e117cf..e1df2963f 100644
--- a/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/BookingSemesterForm.tsx
+++ b/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/BookingSemesterForm.tsx
@@ -7,13 +7,13 @@ import * as yup from "@/lib/validation";
 export type BookingForm = {
   fall: {
     active: boolean;
-    start: string;
-    end: string;
+    start: Date;
+    end: Date;
   };
   spring: {
     active: boolean;
-    start: string;
-    end: string;
+    start: Date;
+    end: Date;
   };
 };
 
@@ -59,7 +59,7 @@ export const BookingSemesterForm: React.FC<Props> = ({ defaultValues, values, on
     formState: { errors },
     control,
     handleSubmit,
-  } = useForm<BookingForm>({
+  } = useForm({
     resolver: yupResolver(validationSchema),
     mode: "onTouched",
     defaultValues,
diff --git a/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/index.tsx b/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/index.tsx
index 91c9292c6..9301e8f17 100644
--- a/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/index.tsx
+++ b/frontend/src/components/pages/cabins/Admin/BookingSemesterPicker/index.tsx
@@ -2,27 +2,31 @@ import { useMutation, useQuery } from "@apollo/client";
 import { Alert, AlertTitle, Snackbar } from "@mui/material";
 import { useState } from "react";
 
+import { BookingForm, BookingSemesterForm } from "./BookingSemesterForm";
+
 import { Link } from "@/components";
 import { BookingSemesterDocument, UpdateBookingSemesterDocument } from "@/generated/graphql";
 import dayjs from "@/lib/date";
 
-import { BookingForm, BookingSemesterForm } from "./BookingSemesterForm";
-
 const DATE_FORMAT = "YYYY-MM-DD";
 
 function formatDate(date: string | Date) {
   return dayjs(date).format(DATE_FORMAT);
 }
 
+function parseDate(date: string) {
+  return dayjs(date, DATE_FORMAT).toDate();
+}
+
 const defaultBookingSemester: BookingForm = {
   fall: {
-    start: formatDate(new Date()),
-    end: formatDate(new Date()),
+    start: new Date(),
+    end: new Date(),
     active: false,
   },
   spring: {
-    start: formatDate(new Date()),
-    end: formatDate(new Date()),
+    start: new Date(),
+    end: new Date(),
     active: false,
   },
 };
@@ -90,13 +94,13 @@ function useBookingSemester(): BookingForm | undefined {
   if (data?.bookingSemester) {
     values = {
       fall: {
-        start: data.bookingSemester.fallStartDate,
-        end: data.bookingSemester.fallEndDate,
+        start: parseDate(data.bookingSemester.fallStartDate),
+        end: parseDate(data.bookingSemester.fallEndDate),
         active: data.bookingSemester.fallSemesterActive,
       },
       spring: {
-        start: data.bookingSemester.springStartDate,
-        end: data.bookingSemester.springEndDate,
+        start: parseDate(data.bookingSemester.springStartDate),
+        end: parseDate(data.bookingSemester.springEndDate),
         active: data.bookingSemester.springSemesterActive,
       },
     };
diff --git a/frontend/src/components/pages/cabins/booking/Steps/Contract.tsx b/frontend/src/components/pages/cabins/booking/Steps/Contract.tsx
index 2f2b31eb4..b63cc2f76 100644
--- a/frontend/src/components/pages/cabins/booking/Steps/Contract.tsx
+++ b/frontend/src/components/pages/cabins/booking/Steps/Contract.tsx
@@ -16,17 +16,17 @@ import {
 import Image from "next/image";
 import { useForm } from "react-hook-form";
 
-import { ActiveBookingResponsibleDocument, CabinFragment } from "@/generated/graphql";
-import dayjs from "@/lib/date";
-import * as yup from "@/lib/validation";
-import hytteforeningen from "~/public/static/cabins/logo.svg";
-
 import { useStepContext } from "../StepContext";
 
 import { calculatePrice } from "./calculatePrice";
 import { ContactInfo } from "./ContactInfo";
 import { Stepper } from "./Stepper";
 
+import { ActiveBookingResponsibleDocument, CabinFragment } from "@/generated/graphql";
+import dayjs from "@/lib/date";
+import * as yup from "@/lib/validation";
+import hytteforeningen from "~/public/static/cabins/logo.svg";
+
 type Props = {
   chosenCabins: CabinFragment[];
   contactInfo: ContactInfo | undefined;
@@ -43,11 +43,15 @@ export const Contract: React.FC<Props> = ({ chosenCabins, contactInfo, startDate
     register,
     handleSubmit,
     formState: { errors },
-  } = useForm<{ approved: boolean }>({
+  } = useForm({
     resolver: yupResolver(
-      yup.object({
-        approved: yup.boolean().required("Du må godkjenne leieavtalen").isTrue("Du må godkjenne leieavtalen"),
-      })
+      yup
+        .object({
+          approved: yup.boolean().required("Du må godkjenne leieavtalen").isTrue("Du må godkjenne leieavtalen"),
+        })
+        .shape({
+          approved: yup.boolean().required().isTrue(),
+        })
     ),
     defaultValues: {
       approved: false,
diff --git a/frontend/yarn.lock b/frontend/yarn.lock
index a53c9a906..46d2009cb 100644
--- a/frontend/yarn.lock
+++ b/frontend/yarn.lock
@@ -1565,10 +1565,10 @@
   dependencies:
     "@hapi/hoek" "^9.0.0"
 
-"@hookform/resolvers@^3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@hookform/resolvers/-/resolvers-3.1.0.tgz#ff83ef4aa6078173201da131ceea4c3583b67034"
-  integrity sha512-z0A8K+Nxq+f83Whm/ajlwE6VtQlp/yPHZnXw7XWVPIGm1Vx0QV8KThU3BpbBRfAZ7/dYqCKKBNnQh85BkmBKkA==
+"@hookform/resolvers@^3.3.4":
+  version "3.3.4"
+  resolved "https://registry.yarnpkg.com/@hookform/resolvers/-/resolvers-3.3.4.tgz#de9b668c2835eb06892290192de6e2a5c906229b"
+  integrity sha512-o5cgpGOuJYrd+iMKvkttOclgwRW86EsWJZZRC23prf0uU2i48Htq4PuT73AVb9ionFyZrwYEITuOFGF+BydEtQ==
 
 "@humanwhocodes/config-array@^0.11.10":
   version "0.11.10"