diff --git a/frontend/src/lib/components/UserMenu.svelte b/frontend/src/lib/components/UserMenu.svelte
index bf3e2d7..3fb7bb2 100644
--- a/frontend/src/lib/components/UserMenu.svelte
+++ b/frontend/src/lib/components/UserMenu.svelte
@@ -90,7 +90,10 @@
 				<div {...$ledgerIdRadioGroup} use:ledgerIdRadioGroup>
 					{#each availableLedgerIdStrings as ledgerIdString}
 						<div
-							{...$ledgerIdRadioItem({ value: ledgerIdString })}
+							{...$ledgerIdRadioItem({
+								value: ledgerIdString,
+								disabled: ledgerIdString === LedgerId.MAINNET.toString(),
+							})}
 							use:ledgerIdRadioItem
 							class="item radioItem"
 						>
diff --git a/frontend/src/routes/dashboard/+layout.svelte b/frontend/src/routes/dashboard/+layout.svelte
index 58c0a4d..3a78113 100644
--- a/frontend/src/routes/dashboard/+layout.svelte
+++ b/frontend/src/routes/dashboard/+layout.svelte
@@ -34,8 +34,8 @@
 		{#snippet initialized({ hashConnect })}
 			<div role="menu" class="connectionMenu">
 				<select bind:value={hashConnect.selectedLedgerId}>
-					<option value={LedgerId.TESTNET}>{LedgerId.TESTNET}</option>
-					<option value={LedgerId.MAINNET}>{LedgerId.MAINNET}</option>
+					<option value={LedgerId.TESTNET} selected>{LedgerId.TESTNET}</option>
+					<option value={LedgerId.MAINNET} disabled>{LedgerId.MAINNET}</option>
 				</select>
 
 				<button