diff --git a/foundry.toml b/foundry.toml
index 36e4e63e8..f9679ee61 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -3,7 +3,7 @@ fs_permissions = [{ access = "read-write", path = "./"}]
 
 [rpc_endpoints]
 # The RPC URLs are modified versions of the default for testing initialization.
-mainnet = "https://mainnet.infura.io/v3/16a8be88795540b9b3903d8de0f7baa5" # Different API key.
+mainnet = "https://mainnet.infura.io/v3/b1d3925804e74152b316ca7da97060d3" # Different API key.
 optimism_goerli = "https://goerli.optimism.io/" # Adds a trailing slash.
 arbitrum_one_goerli = "https://goerli-rollup.arbitrum.io/rpc/" # Adds a trailing slash.
 needs_undefined_env_var = "${UNDEFINED_RPC_URL_PLACEHOLDER}"
diff --git a/src/StdChains.sol b/src/StdChains.sol
index 41c16b41f..f97637fc4 100644
--- a/src/StdChains.sol
+++ b/src/StdChains.sol
@@ -187,13 +187,13 @@ abstract contract StdChains {
         // If adding an RPC here, make sure to test the default RPC URL in `testRpcs`
         setChainWithDefaultRpcUrl("anvil", ChainData("Anvil", 31337, "http://127.0.0.1:8545"));
         setChainWithDefaultRpcUrl(
-            "mainnet", ChainData("Mainnet", 1, "https://mainnet.infura.io/v3/f4a0bdad42674adab5fc0ac077ffab2b")
+            "mainnet", ChainData("Mainnet", 1, "https://mainnet.infura.io/v3/b9794ad1ddf84dfb8c34d6bb5dca2001")
         );
         setChainWithDefaultRpcUrl(
-            "goerli", ChainData("Goerli", 5, "https://goerli.infura.io/v3/f4a0bdad42674adab5fc0ac077ffab2b")
+            "goerli", ChainData("Goerli", 5, "https://goerli.infura.io/v3/b9794ad1ddf84dfb8c34d6bb5dca2001")
         );
         setChainWithDefaultRpcUrl(
-            "sepolia", ChainData("Sepolia", 11155111, "https://sepolia.infura.io/v3/f4a0bdad42674adab5fc0ac077ffab2b")
+            "sepolia", ChainData("Sepolia", 11155111, "https://sepolia.infura.io/v3/b9794ad1ddf84dfb8c34d6bb5dca2001")
         );
         setChainWithDefaultRpcUrl("optimism", ChainData("Optimism", 10, "https://mainnet.optimism.io"));
         setChainWithDefaultRpcUrl("optimism_goerli", ChainData("Optimism Goerli", 420, "https://goerli.optimism.io"));
diff --git a/test/StdChains.t.sol b/test/StdChains.t.sol
index f542e77c8..f0ede99c8 100644
--- a/test/StdChains.t.sol
+++ b/test/StdChains.t.sol
@@ -6,7 +6,7 @@ import "../src/Test.sol";
 contract StdChainsTest is Test {
     function testChainRpcInitialization() public {
         // RPCs specified in `foundry.toml` should be updated.
-        assertEq(getChain(1).rpcUrl, "https://mainnet.infura.io/v3/16a8be88795540b9b3903d8de0f7baa5");
+        assertEq(getChain(1).rpcUrl, "https://mainnet.infura.io/v3/b1d3925804e74152b316ca7da97060d3");
         assertEq(getChain("optimism_goerli").rpcUrl, "https://goerli.optimism.io/");
         assertEq(getChain("arbitrum_one_goerli").rpcUrl, "https://goerli-rollup.arbitrum.io/rpc/");
 
@@ -18,11 +18,11 @@ contract StdChainsTest is Test {
 
         // Cannot override RPCs defined in `foundry.toml`
         vm.setEnv("MAINNET_RPC_URL", "myoverride2");
-        assertEq(getChain("mainnet").rpcUrl, "https://mainnet.infura.io/v3/16a8be88795540b9b3903d8de0f7baa5");
+        assertEq(getChain("mainnet").rpcUrl, "https://mainnet.infura.io/v3/b1d3925804e74152b316ca7da97060d3");
 
         // Other RPCs should remain unchanged.
         assertEq(getChain(31337).rpcUrl, "http://127.0.0.1:8545");
-        assertEq(getChain("sepolia").rpcUrl, "https://sepolia.infura.io/v3/f4a0bdad42674adab5fc0ac077ffab2b");
+        assertEq(getChain("sepolia").rpcUrl, "https://sepolia.infura.io/v3/b9794ad1ddf84dfb8c34d6bb5dca2001");
     }
 
     function testRpc(string memory rpcAlias) internal {