diff --git a/package.json b/package.json
index 2111356..dec8e91 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
     "@types/jest": "^24.0.0",
-    "@types/node": "^12.0.0",
+    "@types/node": "^14.14.35",
     "@types/react-dom": "^16.9.8",
     "@types/react-select": "^3.0.14",
     "@types/styled-components": "^5.1.1",
diff --git a/src/components/elements.tsx b/src/components/elements.tsx
index 060b217..48d81de 100644
--- a/src/components/elements.tsx
+++ b/src/components/elements.tsx
@@ -70,7 +70,7 @@ const StyledButton = styled.button`
 
 interface IIconButtonProps {
   icon: string;
-  onClick: any;
+  onClick: (e: React.FormEvent) => void;
 }
 
 /**
diff --git a/src/components/modal.tsx b/src/components/modal.tsx
index 566dee3..aede217 100644
--- a/src/components/modal.tsx
+++ b/src/components/modal.tsx
@@ -52,7 +52,7 @@ interface IModalProps {
  * @param {IModalProps} props - The needed props for the modal
  */
 const Modal = ({ element, icon, text, condition, title, onClose, children }: IModalProps) => {
-  const [modalHidden, setModalHidden] = useState(condition ?? true);
+  const [modalHidden, setModalHidden] = useState<boolean>(condition ?? true);
 
   const closeModal = () => {
     if (onClose) onClose();
diff --git a/src/components/searchBar.tsx b/src/components/searchBar.tsx
index 3e730e1..0e27036 100644
--- a/src/components/searchBar.tsx
+++ b/src/components/searchBar.tsx
@@ -56,9 +56,7 @@ const SearchBar = ({ providers }: ISearchBarProps) => {
   let [input, setInput] = useState<string>("");
   let [buttonsHidden, setButtonsHidden] = useState<boolean>(true);
 
-  useEffect(() => {
-    setButtonsHidden(input === "");
-  }, [input]);
+  useEffect(() => setButtonsHidden(input === ""), [input]);
 
   const handleSearchQuery = (e: React.FormEvent) => {
     var query: string = input || "";
diff --git a/src/components/settings.tsx b/src/components/settings.tsx
index 1160c16..a765697 100644
--- a/src/components/settings.tsx
+++ b/src/components/settings.tsx
@@ -1,7 +1,7 @@
 import React, { useState } from "react";
 import styled from "styled-components";
 
-import Select, { Styles } from "react-select";
+import Select, { Styles, ValueType } from "react-select";
 
 import { ISearchProviderProps } from "./searchBar";
 import selectedTheme, { setTheme, IThemeProps } from "../lib/theme";
@@ -118,14 +118,13 @@ interface ISettingsProps {
   providers: Array<ISearchProviderProps> | undefined;
 }
 
-
 /**
  * Handles the settings-modal
  * @param {Array<IThemeProps>} themes - the list of themes a user can select between
  * @param {Array<ISearchProviderProps>} providers - the list of search providers
  */
 const Settings = ({ themes, providers }: ISettingsProps) => {
-  const [newTheme, setNewTheme] = useState();
+  const [newTheme, setNewTheme] = useState<IThemeProps>();
 
   if (themes && providers) {
     return (
@@ -137,8 +136,8 @@ const Settings = ({ themes, providers }: ISettingsProps) => {
               <Select
                 options={themes}
                 defaultValue={selectedTheme}
-                onChange={(e: any) => {
-                  setNewTheme(e);
+                onChange={(e: ValueType<IThemeProps, false>) => {
+                  if (e !== null && e !== undefined) setNewTheme(e);
                 }}
                 styles={SelectorStyle}
               />
diff --git a/src/lib/fetcher.tsx b/src/lib/fetcher.tsx
index a74d028..54a362b 100644
--- a/src/lib/fetcher.tsx
+++ b/src/lib/fetcher.tsx
@@ -148,7 +148,7 @@ export const useFetcher = () => {
 
   const callback = useCallback(() => {
     (inProduction ? fetchProduction : fetchDevelopment).then(
-      ([appData, bookmarkData, searchData, themeData, imprintData]: any) => {
+      ([appData, bookmarkData, searchData, themeData, imprintData]: [IAppDataProps, IBookmarkDataProps, ISearchProviderDataProps, IThemeDataProps, IImprintDataProps]) => {
         (appData.error) ? setAppData(appData) : setAppData({ ...appData, error: false });
         (bookmarkData.error) ? setBookmarkData(bookmarkData) : setBookmarkData({ ...bookmarkData, error: false });
         (searchData.error) ? setSearchProviderData(searchData) : setSearchProviderData({ ...searchData, error: false });
diff --git a/yarn.lock b/yarn.lock
index 50f9057..4abd6c9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1700,10 +1700,10 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.21.tgz#d934aacc22424fe9622ebf6857370c052eae464e"
   integrity sha512-cHYfKsnwllYhjOzuC5q1VpguABBeecUp24yFluHpn/BQaVxB1CuQ1FSRZCzrPxrkIfWISXV2LbeoBthLWg0+0A==
 
-"@types/node@^12.0.0":
-  version "12.19.14"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.19.14.tgz#59e5029a3c2aea34f68b717955381692fd47cafb"
-  integrity sha512-2U9uLN46+7dv9PiS8VQJcHhuoOjiDPZOLAt0WuA1EanEknIMae+2QbMhayF7cgGqjvRVIfNpt+6jLPczJZFiRw==
+"@types/node@^14.14.35":
+  version "14.14.35"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-14.14.35.tgz#42c953a4e2b18ab931f72477e7012172f4ffa313"
+  integrity sha512-Lt+wj8NVPx0zUmUwumiVXapmaLUcAk3yPuHCFVXras9k5VT9TdhJqKqGVUQCD60OTMCl0qxJ57OiTL0Mic3Iag==
 
 "@types/parse-json@^4.0.0":
   version "4.0.0"