diff --git a/src/services/CardDeck.ts b/src/services/CardDeck.ts
index 8c4600c..e294eee 100644
--- a/src/services/CardDeck.ts
+++ b/src/services/CardDeck.ts
@@ -11,9 +11,9 @@ import rollDice from '@brdgm/brdgm-commons/src/util/random/rollDice'
 export default class CardDeck {
 
   // special cards for setup
-  private static readonly CARD_2 = 2
-  private static readonly CARD_9 = 9
-  private static readonly CARD_15 = 15
+  private static readonly CARD_2 = '2'
+  private static readonly CARD_9 = '9'
+  private static readonly CARD_15 = '15'
 
   private _deck : Card[]
   private _reserve : Card[]
@@ -135,7 +135,7 @@ export default class CardDeck {
 
 }
 
-function moveCardToDeck(deck1: Card[], deck2: Card[], cardId: number) {
+function moveCardToDeck(deck1: Card[], deck2: Card[], cardId: string) {
   const cardIndex = deck1.findIndex(card => card.id == cardId)
   const movedCard = deck1.splice(cardIndex, 1)[0]
   deck2.unshift(movedCard)
diff --git a/src/store/state.ts b/src/store/state.ts
index 9521993..4eac480 100644
--- a/src/store/state.ts
+++ b/src/store/state.ts
@@ -79,7 +79,7 @@ export interface RoundTurn {
   cardDeck?: CardDeckPersistence
 }
 export interface CardDeckPersistence {
-  deck: number[]
-  reserve: number[]
-  discard: number[]
+  deck: string[]
+  reserve: string[]
+  discard: string[]
 }
diff --git a/tests/unit/services/BotActions.spec.ts b/tests/unit/services/BotActions.spec.ts
index 5f8ebe1..f082598 100644
--- a/tests/unit/services/BotActions.spec.ts
+++ b/tests/unit/services/BotActions.spec.ts
@@ -11,7 +11,7 @@ import { expect } from 'chai'
 
 describe('BotActions', () => {
   it('1,6-round1', () => {
-    const botActions = new BotActions(Cards.get(1), Cards.get(6),
+    const botActions = new BotActions(Cards.get('1'), Cards.get('6'),
         1, BotFaction.TERRANS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(2)
@@ -26,7 +26,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-terrans', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.TERRANS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(3)
@@ -46,7 +46,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-xenos', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.XENOS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(3)
@@ -66,7 +66,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-taklons', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.TAKLONS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(3)
@@ -86,7 +86,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-hadsch-hallas', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.HADSCH_HALLAS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(2)
@@ -101,7 +101,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-geodens', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.GEODENS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(3)
@@ -121,7 +121,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-firaks', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.FIRAKS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(2)
@@ -136,7 +136,7 @@ describe('BotActions', () => {
   })
 
   it('13/2-itars', () => {
-    const botActions = new BotActions(Cards.get(13), Cards.get(2),
+    const botActions = new BotActions(Cards.get('13'), Cards.get('2'),
         1, BotFaction.ITARS, DifficultyLevel.AUTOMA)
 
     expect(botActions.actions.length).to.eq(3)
diff --git a/tests/unit/services/CardDeck.spec.ts b/tests/unit/services/CardDeck.spec.ts
index 5e1a3ac..054f273 100644
--- a/tests/unit/services/CardDeck.spec.ts
+++ b/tests/unit/services/CardDeck.spec.ts
@@ -27,7 +27,7 @@ describe('CardDeck', () => {
     expect(cardDeck.discard.length, 'discard size').to.eq(0)
 
     const persistence = cardDeck.toPersistence()
-    expect(persistence.deck.includes(9), '9 in deck').to.true
+    expect(persistence.deck.includes('9'), '9 in deck').to.true
   })
 
   it('new-level4', () => {
@@ -38,8 +38,8 @@ describe('CardDeck', () => {
     expect(cardDeck.discard.length, 'discard size').to.eq(0)
 
     const persistence = cardDeck.toPersistence()
-    expect(persistence.deck.includes(9), '9 in deck').to.true
-    expect(persistence.deck.includes(15), '15 in deck').to.true
+    expect(persistence.deck.includes('9'), '9 in deck').to.true
+    expect(persistence.deck.includes('15'), '15 in deck').to.true
   })
 
   it('new-level5', () => {
@@ -50,61 +50,61 @@ describe('CardDeck', () => {
     expect(cardDeck.discard.length, 'discard size').to.eq(0)
 
     const persistence = cardDeck.toPersistence()
-    expect(persistence.deck.includes(9), '9 in deck').to.true
-    expect(persistence.deck.includes(15), '15 in deck').to.true
+    expect(persistence.deck.includes('9'), '9 in deck').to.true
+    expect(persistence.deck.includes('15'), '15 in deck').to.true
   })
 
   it('draw-pass-deck-empty', () => {
     const cardDeck = CardDeck.fromPersistence({
-      deck: [4,6,7,9],
+      deck: ['4','6','7','9'],
       discard: [],
       reserve: []
     })
 
     expect(cardDeck.draw(), '1st draw').to.true
-    expect(cardDeck.actionCard?.id, '1st action card').to.eq(6)
-    expect(cardDeck.supportCard?.id, '1st support card').to.eq(4)
+    expect(cardDeck.actionCard?.id, '1st action card').to.eq('6')
+    expect(cardDeck.supportCard?.id, '1st support card').to.eq('4')
     expect(cardDeck.isPass(), '1st pass').to.false
 
     expect(cardDeck.draw(), '2nd draw').to.true
-    expect(cardDeck.actionCard?.id, '2nd action card').to.eq(7)
-    expect(cardDeck.supportCard?.id, '2nd support card').to.eq(6)
+    expect(cardDeck.actionCard?.id, '2nd action card').to.eq('7')
+    expect(cardDeck.supportCard?.id, '2nd support card').to.eq('6')
     expect(cardDeck.isPass(), '2nd pass').to.false
 
     expect(cardDeck.draw(), '3rd draw').to.true
-    expect(cardDeck.actionCard?.id, '3rd action card').to.eq(9)
-    expect(cardDeck.supportCard?.id, '3rd support card').to.eq(7)
+    expect(cardDeck.actionCard?.id, '3rd action card').to.eq('9')
+    expect(cardDeck.supportCard?.id, '3rd support card').to.eq('7')
     expect(cardDeck.isPass(), '3rd pass').to.false
 
     expect(cardDeck.draw(), '4th draw').to.false
     expect(cardDeck.actionCard, '4th action card').to.undefined
-    expect(cardDeck.supportCard?.id, '4th support card').to.eq(9)
+    expect(cardDeck.supportCard?.id, '4th support card').to.eq('9')
     expect(cardDeck.isPass(), '4th pass').to.true
   })
 
   it('draw-pass-last-3', () => {
     const cardDeck = CardDeck.fromPersistence({
-      deck: [1,2,3,4],
+      deck: ['1','2','3','4'],
       discard: [],
       reserve: []
     })
 
     expect(cardDeck.draw(), '1st draw').to.true
-    expect(cardDeck.actionCard?.id, '1st action card').to.eq(2)
-    expect(cardDeck.supportCard?.id, '1st support card').to.eq(1)
+    expect(cardDeck.actionCard?.id, '1st action card').to.eq('2')
+    expect(cardDeck.supportCard?.id, '1st support card').to.eq('1')
     expect(cardDeck.isPass(), '1st pass').to.false
 
     expect(cardDeck.draw(), '2nd draw').to.true
-    expect(cardDeck.actionCard?.id, '2nd action card').to.eq(3)
-    expect(cardDeck.supportCard?.id, '2nd support card').to.eq(2)
+    expect(cardDeck.actionCard?.id, '2nd action card').to.eq('3')
+    expect(cardDeck.supportCard?.id, '2nd support card').to.eq('2')
     expect(cardDeck.isPass(), '2nd pass').to.true
   })
 
   it('prepareForNextRound', () => {
     const cardDeck = CardDeck.fromPersistence({
-      deck: [1,2],
-      discard: [3,4],
-      reserve: [6,7]
+      deck: ['1','2'],
+      discard: ['3','4'],
+      reserve: ['6','7']
     })
 
     cardDeck.prepareForNextRound()
@@ -113,6 +113,6 @@ describe('CardDeck', () => {
     expect(persistence.deck.length, 'deck size').to.eq(5)
     expect(persistence.discard.length, 'deck size').to.eq(0)
     expect(persistence.reserve.length, 'deck size').to.eq(1)
-    expect(persistence.deck.includes(6), 'includes reserve card').to.true
+    expect(persistence.deck.includes('6'), 'includes reserve card').to.true
   })
 })
diff --git a/tests/unit/services/Cards.spec.ts b/tests/unit/services/Cards.spec.ts
index 7ded347..5fb5127 100644
--- a/tests/unit/services/Cards.spec.ts
+++ b/tests/unit/services/Cards.spec.ts
@@ -4,10 +4,10 @@ import { expect } from 'chai'
 
 describe('Cards', () => {
   it('get', () => {
-    const card = Cards.get(1)
+    const card = Cards.get('1')
 
     expect(card).not.undefined
-    expect(card?.id).to.eq(1)
+    expect(card?.id).to.eq('1')
   })
 
   it('getAll', () => {