diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index f4d9c68bd..b5c000473 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -1,7 +1,4 @@
 rules:
-  linebreak-style:
-    - 2
-    - unix
   quotes:
     - 1 # While https://github.com/eslint/eslint/issues/9662#issuecomment-353958854 we don't enforce this
     - single
@@ -14,10 +11,13 @@ rules:
   react/jsx-no-target-blank: 0
   react/no-unescaped-entities: 0
   react/display-name: 1
+  react-hooks/rules-of-hooks: error
+  react-hooks/exhaustive-deps: warn
 parser: babel-eslint
 
 plugins:
   - react
+  - react-hooks
   - flowtype
 env:
   browser: true
diff --git a/package.json b/package.json
index 4bbf6b38b..26e75d1b2 100644
--- a/package.json
+++ b/package.json
@@ -123,6 +123,7 @@
 		"eslint-config-prettier": "^4.0.0",
 		"eslint-plugin-flowtype": "^3.2.1",
 		"eslint-plugin-react": "^7.12.4",
+		"eslint-plugin-react-hooks": "^2.0.1",
 		"express": "^4.16.3",
 		"file-loader": "^1.1.11",
 		"flow-bin": "^0.92.0",
diff --git a/source/components/AttachDictionary.js b/source/components/AttachDictionary.js
index 42fbba6f8..733132fcf 100644
--- a/source/components/AttachDictionary.js
+++ b/source/components/AttachDictionary.js
@@ -8,6 +8,7 @@ import Overlay from './Overlay'
 // Il suffit à la section d'appeler une fonction fournie en lui donnant du JSX
 export let AttachDictionary = dictionary => Decorated =>
 	function withDictionary(props) {
+		// eslint-disable-next-line react-hooks/rules-of-hooks
 		const [{ explanation, term }, setState] = useState({
 			term: null,
 			explanation: null
diff --git a/source/components/CurrencyInput/CurrencyInput.js b/source/components/CurrencyInput/CurrencyInput.js
index 2dcd46ccc..7507264ff 100644
--- a/source/components/CurrencyInput/CurrencyInput.js
+++ b/source/components/CurrencyInput/CurrencyInput.js
@@ -1,5 +1,5 @@
 import classnames from 'classnames'
-import React, { useEffect, useRef, useState } from 'react'
+import React, { useRef, useState } from 'react'
 import NumberFormat from 'react-number-format'
 import { debounce } from '../../utils'
 import './CurrencyInput.css'
@@ -22,23 +22,27 @@ let currencyFormat = language => ({
 })
 
 export default function CurrencyInput({
-	value: valueArg,
+	value: valueProp = '',
 	debounce: debounceTimeout,
 	onChange,
 	language,
 	className,
 	...forwardedProps
 }) {
-	const [currentValue, setCurrentValue] = useState(valueArg)
-	const [initialValue] = useState(valueArg)
-	// When the component is rendered with a new "value" argument, we update our local state
-	useEffect(() => {
-		setCurrentValue(valueArg)
-	}, [valueArg])
-	const nextValue = useRef(null)
+	const [initialValue, setInitialValue] = useState(valueProp)
+	const [currentValue, setCurrentValue] = useState(valueProp)
 	const onChangeDebounced = useRef(
 		debounceTimeout ? debounce(debounceTimeout, onChange) : onChange
 	)
+	// We need some mutable reference because the <NumberFormat /> component doesn't provide
+	// the DOM `event` in its custom `onValueChange` handler
+	const nextValue = useRef(null)
+
+	// When the component is rendered with a new "value" prop, we reset our local state
+	if (valueProp !== initialValue) {
+		setCurrentValue(valueProp)
+		setInitialValue(valueProp)
+	}
 
 	const handleChange = event => {
 		// Only trigger the `onChange` event if the value has changed -- and not
@@ -61,19 +65,17 @@ export default function CurrencyInput({
 		thousandSeparator,
 		decimalSeparator
 	} = currencyFormat(language)
-
-	// We display negative numbers iff this was the provided value (but we allow the user to enter them)
+	// We display negative numbers iff this was the provided value (but we disallow the user to enter them)
 	const valueHasChanged = currentValue !== initialValue
 
 	// Autogrow the input
-	const valueLength = (currentValue || '').toString().length
+	const valueLength = currentValue.toString().length
+	const width = `${5 + (valueLength - 5) * 0.75}em`
 
 	return (
 		<div
 			className={classnames(className, 'currencyInput__container')}
-			{...(valueLength > 5
-				? { style: { width: `${5 + (valueLength - 5) * 0.75}em` } }
-				: {})}>
+			{...(valueLength > 5 ? { style: { width } } : {})}>
 			{isCurrencyPrefixed && '€'}
 			<NumberFormat
 				{...forwardedProps}
@@ -84,10 +86,10 @@ export default function CurrencyInput({
 				inputMode="numeric"
 				onValueChange={({ value }) => {
 					setCurrentValue(value)
-					nextValue.current = value.toString().replace(/^\-/, '')
+					nextValue.current = value.toString().replace(/^-/, '')
 				}}
 				onChange={handleChange}
-				value={(currentValue || '').toString().replace('.', decimalSeparator)}
+				value={currentValue.toString().replace('.', decimalSeparator)}
 			/>
 			{!isCurrencyPrefixed && <>&nbsp;€</>}
 		</div>
diff --git a/source/components/PercentageField.js b/source/components/PercentageField.js
index e0abf0e7d..e85eabf7a 100644
--- a/source/components/PercentageField.js
+++ b/source/components/PercentageField.js
@@ -4,7 +4,8 @@ import './PercentageField.css'
 export default function PercentageField({ onChange, value, debounce }) {
 	const [localValue, setLocalValue] = useState(value)
 	const debouncedOnChange = useCallback(
-		debounce ? debounce(debounce, onChange) : onChange
+		debounce ? debounce(debounce, onChange) : onChange,
+		[debounce, onChange]
 	)
 
 	return (
diff --git a/source/components/PeriodSwitch.js b/source/components/PeriodSwitch.js
index e87d33920..1feb823a1 100644
--- a/source/components/PeriodSwitch.js
+++ b/source/components/PeriodSwitch.js
@@ -1,5 +1,5 @@
 import { findRuleByDottedName } from 'Engine/rules'
-import React, { useEffect } from 'react'
+import React, { useCallback, useEffect } from 'react'
 import { Trans } from 'react-i18next'
 import { useDispatch, useSelector } from 'react-redux'
 import {
@@ -15,17 +15,20 @@ export default function PeriodSwitch() {
 	const initialPeriod = useSelector(
 		state => state.simulation?.config?.situation?.période
 	)
+	const currentPeriod = situation.période
 	useEffect(() => {
 		!currentPeriod && updatePeriod(initialPeriod || 'année')
-	}, [])
-	const currentPeriod = situation.période
-	const updatePeriod = toPeriod => {
-		const needConversion = Object.keys(situation).filter(dottedName => {
-			const rule = findRuleByDottedName(rules, dottedName)
-			return rule?.période === 'flexible'
-		})
-		dispatch({ type: 'UPDATE_PERIOD', toPeriod, needConversion })
-	}
+	}, [currentPeriod, initialPeriod, updatePeriod])
+	const updatePeriod = useCallback(
+		toPeriod => {
+			const needConversion = Object.keys(situation).filter(dottedName => {
+				const rule = findRuleByDottedName(rules, dottedName)
+				return rule?.période === 'flexible'
+			})
+			dispatch({ type: 'UPDATE_PERIOD', toPeriod, needConversion })
+		},
+		[dispatch, rules, situation]
+	)
 	const periods = ['mois', 'année']
 
 	return (
diff --git a/source/components/SearchBar.js b/source/components/SearchBar.js
index 31f384035..5294b3919 100644
--- a/source/components/SearchBar.js
+++ b/source/components/SearchBar.js
@@ -2,7 +2,7 @@ import withSitePaths from 'Components/utils/withSitePaths'
 import { encodeRuleName } from 'Engine/rules.js'
 import Fuse from 'fuse.js'
 import { compose, pick, sortBy } from 'ramda'
-import React, { useRef, useState } from 'react'
+import React, { useMemo, useRef, useState } from 'react'
 import Highlighter from 'react-highlight-words'
 import { useTranslation } from 'react-i18next'
 import { Link, Redirect } from 'react-router-dom'
@@ -19,28 +19,23 @@ function SearchBar({
 	const [inputValue, setInputValue] = useState(null)
 	const [selectedOption, setSelectedOption] = useState(null)
 	const inputElementRef = useRef()
-	const fuse = useRef()
+	// This operation is expensive, we don't want to do it everytime we re-render, so we cache its result
+	const fuse = useMemo(() => {
+		const list = rules.map(
+			pick(['title', 'espace', 'description', 'name', 'dottedName'])
+		)
+		const options = {
+			keys: [
+				{ name: 'name', weight: 0.3 },
+				{ name: 'title', weight: 0.3 },
+				{ name: 'espace', weight: 0.2 },
+				{ name: 'description', weight: 0.2 }
+			]
+		}
+		return new Fuse(list, options)
+	}, [rules])
 	const { i18n } = useTranslation()
 
-	const options = {
-		keys: [
-			{ name: 'name', weight: 0.3 },
-			{ name: 'title', weight: 0.3 },
-			{ name: 'espace', weight: 0.2 },
-			{ name: 'description', weight: 0.2 }
-		]
-	}
-	if (!fuse.current) {
-		// This operation is expensive, we don't want to do it everytime we re-render, so we cache its result in a reference
-		fuse.current = new Fuse(
-			rules.map(pick(['title', 'espace', 'description', 'name', 'dottedName'])),
-			options
-		)
-	}
-
-	const handleChange = selectedOption => {
-		setSelectedOption(selectedOption)
-	}
 	const renderOption = ({ title, dottedName }) => (
 		<span>
 			<Highlighter searchWords={[inputValue]} textToHighlight={title} />
@@ -49,7 +44,7 @@ function SearchBar({
 			</span>
 		</span>
 	)
-	const filterOptions = (options, filter) => fuse.current.search(filter)
+	const filterOptions = (options, filter) => fuse.search(filter)
 
 	if (selectedOption != null) {
 		finallyCallback && finallyCallback()
@@ -68,8 +63,8 @@ function SearchBar({
 		<>
 			<Select
 				value={selectedOption && selectedOption.dottedName}
-				onChange={handleChange}
-				onInputChange={inputValue => setInputValue(inputValue)}
+				onChange={setSelectedOption}
+				onInputChange={setInputValue}
 				valueKey="dottedName"
 				labelKey="title"
 				options={rules}
diff --git a/source/components/SearchButton.js b/source/components/SearchButton.js
index 8c2612ae4..d6900a30d 100644
--- a/source/components/SearchButton.js
+++ b/source/components/SearchButton.js
@@ -14,6 +14,13 @@ export default compose(
 )(function SearchButton({ flatRules, invisibleButton }) {
 	const [visible, setVisible] = useState(false)
 	useEffect(() => {
+		const handleKeyDown = e => {
+			if (!(e.ctrlKey && e.key === 'k')) return
+			setVisible(true)
+			e.preventDefault()
+			e.stopPropagation()
+			return false
+		}
 		window.addEventListener('keydown', handleKeyDown)
 
 		return () => {
@@ -21,14 +28,6 @@ export default compose(
 		}
 	}, [])
 
-	const handleKeyDown = e => {
-		if (!(e.ctrlKey && e.key === 'k')) return
-		setVisible(true)
-		e.preventDefault()
-		e.stopPropagation()
-		return false
-	}
-
 	const close = () => setVisible(false)
 
 	return visible ? (
diff --git a/source/components/TargetSelection.js b/source/components/TargetSelection.js
index d76ccc956..1dae7bf02 100644
--- a/source/components/TargetSelection.js
+++ b/source/components/TargetSelection.js
@@ -41,8 +41,14 @@ export default compose(
 	const situation = useSituation()
 	const dispatch = useDispatch()
 
+	const targets =
+		analysis?.targets.filter(
+			t =>
+				!secondaryObjectives.includes(t.dottedName) &&
+				t.dottedName !== 'contrat salarié . aides employeur'
+		) || []
+
 	useEffect(() => {
-		let targets = getTargets()
 		// Initialize defaultValue for target that can't be computed
 		targets
 			.filter(
@@ -64,22 +70,10 @@ export default compose(
 				)
 			})
 
-		if (initialRender) {
-			setInitialRender(false)
-		}
+		setInitialRender(false)
+		// eslint-disable-next-line react-hooks/exhaustive-deps
 	}, [])
 
-	const getTargets = () => {
-		if (!analysis) return []
-		return analysis.targets.filter(
-			t =>
-				!secondaryObjectives.includes(t.dottedName) &&
-				t.dottedName !== 'contrat salarié . aides employeur'
-		)
-	}
-
-	let targets = getTargets()
-
 	return (
 		<div id="targetSelection">
 			{(typeof objectifs[0] === 'string' ? [{ objectifs }] : objectifs).map(
diff --git a/source/components/conversation/Question.js b/source/components/conversation/Question.js
index b025504e5..f396cee38 100644
--- a/source/components/conversation/Question.js
+++ b/source/components/conversation/Question.js
@@ -38,10 +38,13 @@ export default compose(
 	value: currentValue
 }) {
 	const [touched, setTouched] = useState(false)
-	const onChange = useCallback(value => {
-		setFormValue(value)
-		setTouched(true)
-	})
+	const onChange = useCallback(
+		value => {
+			setFormValue(value)
+			setTouched(true)
+		},
+		[setFormValue]
+	)
 
 	const renderBinaryQuestion = () => {
 		return (
diff --git a/source/components/conversation/SendButton.js b/source/components/conversation/SendButton.js
index 5514da3a5..10a0f9374 100644
--- a/source/components/conversation/SendButton.js
+++ b/source/components/conversation/SendButton.js
@@ -1,28 +1,29 @@
-import React, { useEffect } from 'react'
+import React, { useCallback, useEffect } from 'react'
 import { Trans } from 'react-i18next'
 
 export default function SendButton({ disabled, submit }) {
+	const getAction = useCallback(cause => (!disabled ? submit(cause) : null), [
+		disabled,
+		submit
+	])
 	useEffect(() => {
+		const handleKeyDown = ({ key }) => {
+			if (key !== 'Enter') return
+			getAction('enter')
+		}
+
 		window.addEventListener('keydown', handleKeyDown)
 		return () => {
 			window.removeEventListener('keydown', handleKeyDown)
 		}
-	}, [])
+	}, [getAction])
 
-	const getAction = () => {
-		return cause => (!disabled ? submit(cause) : null)
-	}
-
-	const handleKeyDown = ({ key }) => {
-		if (key !== 'Enter') return
-		getAction()('enter')
-	}
 	return (
 		<button
 			className="ui__ button plain"
 			css="margin-left: 1.2rem"
 			disabled={disabled}
-			onClick={() => getAction()('accept')}>
+			onClick={() => getAction('accept')}>
 			<span className="text">
 				<Trans>Suivant</Trans> →
 			</span>
diff --git a/source/components/ui/AnimatedTargetValue.js b/source/components/ui/AnimatedTargetValue.js
index a8f78a822..542b065a9 100644
--- a/source/components/ui/AnimatedTargetValue.js
+++ b/source/components/ui/AnimatedTargetValue.js
@@ -17,7 +17,7 @@ export default function AnimatedTargetValue({ value }: Props) {
 		}
 		setDifference((value || 0) - (previousValue || 0))
 		setPreviousValue(value)
-	}, [value])
+	}, [previousValue, value])
 	const { i18n } = useTranslation()
 
 	const format = value => {
diff --git a/source/components/ui/animate.js b/source/components/ui/animate.js
index 849c41a87..aef23f82c 100644
--- a/source/components/ui/animate.js
+++ b/source/components/ui/animate.js
@@ -131,7 +131,10 @@ export function appear({
 	delay = 0,
 	style
 }) {
+	// TODO: We should rename this function Appear
+	// eslint-disable-next-line react-hooks/rules-of-hooks
 	const [show, setShow] = useState(unless)
+	// eslint-disable-next-line react-hooks/rules-of-hooks
 	useEffect(() => {
 		window.setTimeout(() => setShow(true), 0)
 	}, [])
diff --git a/source/engine/uniroot.js b/source/engine/uniroot.js
index 42ca2dac9..b621243b9 100644
--- a/source/engine/uniroot.js
+++ b/source/engine/uniroot.js
@@ -79,7 +79,7 @@ export default function uniroot(
 
 			if (
 				p < 0.75 * cb * q - Math.abs(tol_act * q) / 2 &&
-				p < Math.abs(prev_step * q / 2)
+				p < Math.abs((prev_step * q) / 2)
 			) {
 				// If (b + p / q) falls in [b,c] and isn't too large it is accepted
 				new_step = p / q
diff --git a/source/sites/mon-entreprise.fr/App.js b/source/sites/mon-entreprise.fr/App.js
index 291db9a3f..5feb02dfa 100644
--- a/source/sites/mon-entreprise.fr/App.js
+++ b/source/sites/mon-entreprise.fr/App.js
@@ -58,7 +58,7 @@ const middlewares = [
 function InFranceRoute({ basename, language }) {
 	useEffect(() => {
 		setToSessionStorage('lang', language)
-	}, [])
+	}, [language])
 	const paths = constructLocalizedSitePath(language)
 	return (
 		<Provider
diff --git a/source/sites/mon-entreprise.fr/layout/Navigation/SideBar.js b/source/sites/mon-entreprise.fr/layout/Navigation/SideBar.js
index d9997c257..0e25f47b7 100644
--- a/source/sites/mon-entreprise.fr/layout/Navigation/SideBar.js
+++ b/source/sites/mon-entreprise.fr/layout/Navigation/SideBar.js
@@ -3,7 +3,7 @@
 import classnames from 'classnames'
 import withTracker from 'Components/utils/withTracker'
 import { compose } from 'ramda'
-import React, { useEffect, useRef, useState } from 'react'
+import React, { useCallback, useEffect, useRef, useState } from 'react'
 import { withRouter } from 'react-router'
 import backSvg from './back.svg'
 import mobileMenuSvg from './mobile-menu.svg'
@@ -19,10 +19,6 @@ type Props = OwnProps & {
 	tracker: Tracker,
 	location: Location
 }
-type State = {
-	opened: boolean,
-	sticky: boolean
-}
 
 const bigScreen = window.matchMedia('(min-width: 1500px)')
 const isParent = (parentNode, children) => {
@@ -35,13 +31,19 @@ const isParent = (parentNode, children) => {
 	return isParent(parentNode, children.parentNode)
 }
 
-function SideBar({ location, tracker, children }) {
+function SideBar({ location, tracker, children }: Props) {
 	const [opened, setOpened] = useState(false)
 	const [sticky, setSticky] = useState(bigScreen.matches)
 	const [previousLocation, setPreviousLocation] = useState(location)
 	const ref = useRef()
 
 	useEffect(() => {
+		const handleClick = event => {
+			if (!sticky && !isParent(ref.current, event.target) && opened) {
+				handleClose()
+			}
+		}
+
 		window.addEventListener('click', handleClick)
 		bigScreen.addListener(handleMediaQueryChange)
 
@@ -49,27 +51,22 @@ function SideBar({ location, tracker, children }) {
 			window.removeEventListener('click', handleClick)
 			bigScreen.removeListener(handleMediaQueryChange)
 		}
-	}, [opened, sticky])
+	}, [handleClose, opened, sticky])
 
 	useEffect(() => {
 		if (!sticky && previousLocation !== location) {
 			setOpened(false)
 		}
 		setPreviousLocation(location)
-	})
+	}, [sticky, previousLocation, location])
 
-	const handleClick = event => {
-		if (!sticky && !isParent(ref.current, event.target) && opened) {
-			handleClose()
-		}
-	}
 	const handleMediaQueryChange = () => {
 		setSticky(bigScreen.matches)
 	}
-	const handleClose = () => {
+	const handleClose = useCallback(() => {
 		tracker.push(['trackEvent', 'Sidebar', 'close'])
 		setOpened(false)
-	}
+	}, [tracker])
 	const handleOpen = () => {
 		tracker.push(['trackEvent', 'Sidebar', 'open'])
 		setOpened(true)
diff --git a/source/sites/mon-entreprise.fr/pages/Dev/IntegrationTest.js b/source/sites/mon-entreprise.fr/pages/Dev/IntegrationTest.js
index 047463284..fc6d2910f 100644
--- a/source/sites/mon-entreprise.fr/pages/Dev/IntegrationTest.js
+++ b/source/sites/mon-entreprise.fr/pages/Dev/IntegrationTest.js
@@ -23,6 +23,7 @@ export default function IntegrationTest() {
 		script.dataset.couleur = colour
 		domNode.current.innerHTML = ''
 		domNode.current.appendChild(script)
+		// eslint-disable-next-line react-hooks/exhaustive-deps
 	}, [version])
 	return (
 		<>
diff --git a/source/sites/mon-entreprise.fr/pages/Iframes/IframeFooter.js b/source/sites/mon-entreprise.fr/pages/Iframes/IframeFooter.js
index 860d234a7..72ea5c59e 100644
--- a/source/sites/mon-entreprise.fr/pages/Iframes/IframeFooter.js
+++ b/source/sites/mon-entreprise.fr/pages/Iframes/IframeFooter.js
@@ -1,7 +1,7 @@
 import LangSwitcher from 'Components/LangSwitcher'
 import marianneSvg from 'Images/marianne.svg'
 import urssafSvg from 'Images/urssaf.svg'
-import React, { useEffect } from 'react'
+import React, { useEffect, useState } from 'react'
 import emoji from 'react-easy-emoji'
 import { Trans } from 'react-i18next'
 import { Link } from 'react-router-dom'
@@ -9,8 +9,10 @@ import screenfull from 'screenfull'
 import { isIE } from '../../../../utils'
 
 export default function IframeFooter() {
+	const [isFullscreen, setIsFullscreen] = useState(screenfull.isFullscreen)
 	useEffect(() => {
-		screenfull.enabled && screenfull.onchange(() => this.forceUpdate())
+		screenfull.enabled &&
+			screenfull.onchange(() => setIsFullscreen(screenfull.isFullscreen))
 	}, [])
 
 	return (
@@ -44,7 +46,7 @@ export default function IframeFooter() {
 					justifyContent: 'space-between'
 				}}>
 				<LangSwitcher className="ui__ button simple" />
-				{screenfull.enabled && !screenfull.isFullscreen && !isIE() && (
+				{screenfull.enabled && !isFullscreen && !isIE() && (
 					<button
 						className="ui__ button small"
 						onClick={() => {
diff --git a/yarn.lock b/yarn.lock
index 6824ff4c6..7b37e251a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3553,6 +3553,11 @@ eslint-plugin-flowtype@^3.2.1:
   dependencies:
     lodash "^4.17.15"
 
+eslint-plugin-react-hooks@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-2.0.1.tgz#e898ec26a0a335af6f7b0ad1f0bedda7143ed756"
+  integrity sha512-xir+3KHKo86AasxlCV8AHRtIZPHljqCRRUYgASkbatmt0fad4+5GgC7zkT7o/06hdKM6MIwp8giHVXqBPaarHQ==
+
 eslint-plugin-react@^7.12.4:
   version "7.14.3"
   resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-7.14.3.tgz#911030dd7e98ba49e1b2208599571846a66bdf13"