diff --git a/.gitignore b/.gitignore
index 85198aa..5ae7e3a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,6 @@ docs/
 
 # Dotenv file
 .env
+
+.DS_Store
+zkout/
diff --git a/foundry.toml b/foundry.toml
index e427eac..b68e952 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -5,6 +5,5 @@ libs = ["lib"]
 remappings = [
   "@chainlink/contracts/=lib/chainlink-brownie-contracts/contracts/",
 ]
-ffi = true
 
 # See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
diff --git a/script/DeployFundMe.s.sol b/script/DeployFundMe.s.sol
index b994310..e421b68 100644
--- a/script/DeployFundMe.s.sol
+++ b/script/DeployFundMe.s.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.28;
+pragma solidity ^0.8.18;
 
 import {Script} from "forge-std/Script.sol";
 import {FundMe} from "../src/FundMe.sol";
diff --git a/script/HelperConfig.s.sol b/script/HelperConfig.s.sol
index 087a507..250e60e 100644
--- a/script/HelperConfig.s.sol
+++ b/script/HelperConfig.s.sol
@@ -3,7 +3,7 @@
 // Sepolia ETH/USD
 // Mainnet ETH/USD
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.28;
+pragma solidity ^0.8.18;
 
 import {Script} from "forge-std/Script.sol";
 import {MockV3Aggregator} from "../test/mocks/MockV3Aggregator.sol";
diff --git a/script/Interactions.s.sol b/script/Interactions.s.sol
index d55570f..f524629 100644
--- a/script/Interactions.s.sol
+++ b/script/Interactions.s.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier
-pragma solidity ^0.8.28;
+pragma solidity ^0.8.18;
 
 import {Script, console} from "forge-std/Script.sol";
 import {FundMe} from "../src/FundMe.sol";
diff --git a/test/integration/InteractionsTest.t.sol b/test/integration/InteractionsTest.t.sol
index 5915393..f9d4435 100644
--- a/test/integration/InteractionsTest.t.sol
+++ b/test/integration/InteractionsTest.t.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier
-pragma solidity ^0.8.28;
+pragma solidity ^0.8.18;
 
 import {Test, console} from "forge-std/Test.sol";
 import {FundMe} from "../../src/FundMe.sol";
@@ -10,8 +10,7 @@ contract InteractionsTest is Test {
     FundMe fundMe;
     address USER = makeAddr("me");
     uint256 constant SEND_VALUE = 0.1 ether;
-    uint256 constant STARTING_BALANCE = 10 ether;
-    uint256 constant GAS_PRICE = 1;
+    uint256 constant STARTING_BALANCE = 1 ether;
 
     function setUp() external {
         DeployFundMe deployFundMe = new DeployFundMe();
@@ -21,6 +20,8 @@ contract InteractionsTest is Test {
 
     function testUserCandFundInteractions() public {
         FundFundMe fundFundMe = new FundFundMe();
+
+        vm.prank(USER);
         fundFundMe.fundFundMe(address(fundMe));
 
         WithdrawFundMe withdrawFundMe = new WithdrawFundMe();
diff --git a/test/unit/FundMeTest.t.sol b/test/unit/FundMeTest.t.sol
index a52127e..694c823 100644
--- a/test/unit/FundMeTest.t.sol
+++ b/test/unit/FundMeTest.t.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier
-pragma solidity ^0.8.28;
+pragma solidity ^0.8.18;
 
 import {Test, console} from "forge-std/Test.sol";
 import {FundMe} from "../../src/FundMe.sol";
diff --git a/test/unit/ZkSyncDevOps.t.sol b/test/unit/ZkSyncDevOps.t.sol
new file mode 100644
index 0000000..4ef8cf3
--- /dev/null
+++ b/test/unit/ZkSyncDevOps.t.sol
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.18;
+
+import {Test, console} from "forge-std/Test.sol";
+import {ZkSyncChainChecker} from "lib/foundry-devops/src/ZkSyncChainChecker.sol";
+import {FoundryZkSyncChecker} from "lib/foundry-devops/src/FoundryZkSyncChecker.sol";
+
+contract ZkSyncDevOps is Test, ZkSyncChainChecker, FoundryZkSyncChecker {
+    // Remove the `skipZkSync`, then run `forge test --mt testZkSyncChainFails --zksync` and this will fail!
+    function testZkSyncChainFails() public skipZkSync {
+        address ripemd = address(uint160(3));
+
+        bool success;
+        // Don't worry about what this "assembly" thing is for now
+        assembly {
+            success := call(gas(), ripemd, 0, 0, 0, 0, 0)
+        }
+        assert(success);
+    }
+
+    // You'll need `ffi=true` in your foundry.toml to run this test
+    // // Remove the `onlyVanillaFoundry`, then run `foundryup-zksync` and then
+    // // `forge test --mt testZkSyncFoundryFails --zksync`
+    // // and this will fail!
+    // function testZkSyncFoundryFails() public onlyVanillaFoundry {
+    //     bool exists = vm.keyExistsJson('{"hi": "true"}', ".hi");
+    //     assert(exists);
+    // }
+}