diff --git a/src/Vm.sol b/src/Vm.sol
index 6b1f2913..db9c52df 100644
--- a/src/Vm.sol
+++ b/src/Vm.sol
@@ -555,6 +555,9 @@ interface VmSafe {
     /// Prompts the user for a hidden string value in the terminal.
     function promptSecret(string calldata promptText) external returns (string memory input);
 
+    /// Prompts the user for hidden uint256 in the terminal (usually pk).
+    function promptSecretUint(string calldata promptText) external returns (uint256);
+
     /// Prompts the user for uint256 in the terminal.
     function promptUint(string calldata promptText) external returns (uint256);
 
diff --git a/test/Vm.t.sol b/test/Vm.t.sol
index 64242122..a1c4ed67 100644
--- a/test/Vm.t.sol
+++ b/test/Vm.t.sol
@@ -9,7 +9,7 @@ contract VmTest is Test {
     // inadvertently moved between Vm and VmSafe. This test must be updated each time a function is
     // added to or removed from Vm or VmSafe.
     function test_interfaceId() public pure {
-        assertEq(type(VmSafe).interfaceId, bytes4(0x536a6b28), "VmSafe");
+        assertEq(type(VmSafe).interfaceId, bytes4(0x3aa0699f), "VmSafe");
         assertEq(type(Vm).interfaceId, bytes4(0xb91a22ba), "Vm");
     }
 }