diff --git a/packages/starksheet-cairo/deployments/katana/deployments.json b/packages/starksheet-cairo/deployments/katana/deployments.json
index 3eb793d..a487bcb 100644
--- a/packages/starksheet-cairo/deployments/katana/deployments.json
+++ b/packages/starksheet-cairo/deployments/katana/deployments.json
@@ -1,27 +1,27 @@
 {
   "BasicCellRenderer": {
-    "address": "0x18ed7de938c2bc754c97121f232bd6f2894893108caf9345d97a176c0773222",
-    "tx": "0xcb49786a194c45890f8f36e10c087fa4c559e2940d3b045ffe4653a871ca4d",
+    "address": "0x72f0bbcf0c3a5262afb31a30476cacd7ff4071bc26f5c03f3f904aecb3cfcae",
+    "tx": "0xc3a6743c73820785962a06087ee17d796e0574cd0eb407699c0c0d53ad35e",
     "artifact": "build/BasicCellRenderer.json"
   },
   "math": {
-    "address": "0x6d6be32cb991e3fb3254e614bb8adae1491855438137f0517652c6f8169d2b6",
-    "tx": "0x5ec7ca48b3763a88a83d3b02b540bed062ee7fc93dc96c60260c5f5dd5177ee",
+    "address": "0x43abcdc87969b3d3de418917e77e320069472aa37595c648335d337518eb78e",
+    "tx": "0x2c3f4f84a2c387890da76b9258e580c04bf2620a8da1c69ebafb4b104225e97",
     "artifact": "build/math.json"
   },
   "execute": {
-    "address": "0x7abaf18fe91f2988c15575b9dcb02eaf88d6c5491e27bd083597aedb21a8ddb",
-    "tx": "0x5d024cd71a27a839fecb233bf6c4b60834fc4d9cd2d52c1095ceaccffa5084a",
+    "address": "0xb2517d88278350caada695b4448ac571fc4c992e2f02a099f0edd6c273ede",
+    "tx": "0x417667436f30615d1d165cbd4ca6e253d671f1b8a3f1a5875e9337c8d3260cf",
     "artifact": "build/execute.json"
   },
   "Starksheet": {
-    "address": "0x7b225e646c173656b09019db3ab3285abdd110e6b3fe773cc1212b3544fe7a4",
-    "tx": "0x57ebffbe8ffbb84600d8257a9e71647f60230abc64e40e4e594574dd8fdfc8",
+    "address": "0x6ec64a6368dfd9c02e0d3d2f23ff527eb4fe5eeb99a30b6f0f009cb5aa9bb55",
+    "tx": "0x5a7841a4befd62392d27f0d35d3902c7d63f96fcc520001c172b25c761d19ba",
     "artifact": "build/Starksheet.json"
   },
   "Multicall": {
-    "address": "0x291d194b924d4900b5f554318eece8ca57ccda4d5c6195fa6a6ebc12e683589",
-    "tx": "0x4d147133290c4ffc669d20545fc47ddec9c085038fbaaac8b8c60772d14016a",
+    "address": "0x5f5749da621dcf8d63610949487af97ce528dd498f90b2c78bf784066dc8e15",
+    "tx": "0x497c5070091a576339f46c8b1f73d6c36c33591563258ace392e2f93d5b4f41",
     "artifact": "build/Multicall.json"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/starksheet-webapp/src/components/Header/Header.tsx b/packages/starksheet-webapp/src/components/Header/Header.tsx
index db0c560..a3d2f0c 100644
--- a/packages/starksheet-webapp/src/components/Header/Header.tsx
+++ b/packages/starksheet-webapp/src/components/Header/Header.tsx
@@ -1,6 +1,6 @@
 import { Box } from "@mui/material";
 import { useSnackbar } from "notistack";
-import React, { useContext, useMemo, useState } from "react";
+import { useContext, useMemo, useState } from "react";
 import { CELL_BORDER_WIDTH, N_ROW } from "../../config";
 import { AccountContext } from "../../contexts/AccountContext";
 import { CellValuesContext } from "../../contexts/CellValuesContext";
@@ -8,6 +8,7 @@ import { OnsheetContext } from "../../contexts/OnsheetContext";
 import { TransactionsContext } from "../../contexts/TransactionsContext";
 import { useSheetContract } from "../../hooks";
 import { chainConfig } from "../../provider/chains";
+import { RC_BOUND } from "../../utils/constants";
 import Button from "../Button/Button";
 import ConnectButton from "../ConnectButton/ConnectButton";
 import GreyCell from "../GreyCell/GreyCell";
@@ -26,7 +27,7 @@ function Header() {
   const { contract } = useSheetContract(sheet?.address);
   const { enqueueSnackbar } = useSnackbar();
   const [loading, setLoading] = useState<boolean>(false);
-  const { values, setValues } = useContext(CellValuesContext);
+  const { values, setValues, updateCells } = useContext(CellValuesContext);
 
   const updateOnClick = async () => {
     setLoading(true);
@@ -64,6 +65,22 @@ function Header() {
     });
   };
 
+  const fillOnClick = () => {
+    const newValues = values[sheet?.address!]
+      .filter((cell) => cell.value === 0n && cell.owner === 0n)
+      .map((cell) => {
+        const value = BigInt(Math.floor(Math.random() * 255)) + 1n;
+        return {
+          ...cell,
+          contractAddress: RC_BOUND,
+          selector: value,
+          value,
+          calldata: [],
+        };
+      });
+    updateCells(newValues);
+  };
+
   const displayUpgrade = useMemo(
     () =>
       sheet?.classHash !== undefined &&
@@ -74,8 +91,6 @@ function Header() {
     [sheet?.classHash, onsheet.sheetClassHash, accountAddress, sheet?.owner],
   );
 
-  const displayCopy = useMemo(() => !!sheet, [sheet]);
-
   const learnMoreButton = (
     <Button
       sx={{ marginLeft: `-${CELL_BORDER_WIDTH}px`, width: "191px" }}
@@ -114,13 +129,26 @@ function Header() {
       Copy sheet
     </Button>
   );
+  const fillSheetButton = (
+    <Button
+      sx={{
+        marginLeft: `-${CELL_BORDER_WIDTH}px`,
+        width: "210px",
+      }}
+      onClick={fillOnClick}
+      variant="1"
+    >
+      Fill sheet
+    </Button>
+  );
   return (
     <Box sx={{ display: "flex" }}>
       <GreyCell sx={{ textIndent: "20px", flex: 1 }}>
         {chainConfig.appName}
       </GreyCell>
       {displayUpgrade && upgradeButton}
-      {displayCopy && copySheetButton}
+      {!!sheet && copySheetButton}
+      {!!sheet && fillSheetButton}
       {learnMoreButton}
       <ConnectButton
         sx={{ width: "174px", marginLeft: `-${CELL_BORDER_WIDTH}px` }}