diff --git a/.env.example b/.env.example
index 5fb6358..abe16ab 100644
--- a/.env.example
+++ b/.env.example
@@ -1 +1,3 @@
 REACT_APP_WALLET_CONNECT_ID=
+REACT_APP_ETHEREUM_MAINNET_CHAIN_ID=1
+REACT_APP_LACONICD_CHAIN_ID=laconic_9000-1
diff --git a/src/context/WalletConnectContext.tsx b/src/context/WalletConnectContext.tsx
index 71490be..c1593da 100644
--- a/src/context/WalletConnectContext.tsx
+++ b/src/context/WalletConnectContext.tsx
@@ -37,7 +37,7 @@ const walletConnectContext = createContext<ContextValue>({
 
 const web3Modal = new WalletConnectModal({
   projectId: PROJECT_ID,
-  chains: ["eip155:1"],
+  chains: [`eip155:${process.env.REACT_APP_ETHEREUM_MAINNET_CHAIN_ID}`],
 });
 
 export const WalletConnectProvider = ({
@@ -112,14 +112,14 @@ export const WalletConnectProvider = ({
     const proposalNamespace = {
       eip155: {
         methods: ["personal_sign"],
-        chains: ["eip155:1"],
+        chains: [`eip155:${process.env.REACT_APP_ETHEREUM_MAINNET_CHAIN_ID}`],
         events: [],
       },
       cosmos: {
         methods: [
           "cosmos_sendTransaction",
         ],
-        chains: ["cosmos:laconic_9000-1"], // TODO: Get chain ID from .env
+        chains: [`cosmos:${process.env.REACT_APP_LACONICD_CHAIN_ID}`],
         events: [],
       },
     };
diff --git a/src/pages/SignWithCosmos.tsx b/src/pages/SignWithCosmos.tsx
index 16aad73..e81a551 100644
--- a/src/pages/SignWithCosmos.tsx
+++ b/src/pages/SignWithCosmos.tsx
@@ -50,7 +50,7 @@ const SignWithCosmos = () => {
         code: number;
       }>({
         topic: session!.topic,
-        chainId: "cosmos:laconic_9000-1", // TODO: Get chain ID from .env
+        chainId: `cosmos:${process.env.REACT_APP_LACONICD_CHAIN_ID}`,
         request: {
           method: "cosmos_sendTransaction",
           params,