diff --git a/.gitignore b/.gitignore
index b83d222..2f7896d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-/target/
+target/
diff --git a/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java b/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
index deb9745..44bd190 100644
--- a/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
+++ b/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
@@ -70,12 +70,12 @@ private String generateValidBolt11Invoice() {
 
         // Generate random payment hash (32 bytes = 52 chars in bech32, roughly)
         // For a minimal valid invoice, we need at least timestamp + payment hash
-        SecureRandom random = new SecureRandom();
+        // Bech32 charset: qpzry9x8gf2tvdw0s3jn54khce6mua7l
         StringBuilder data = new StringBuilder();
 
         // Generate 52 random bech32 characters (represents ~32 bytes of data)
         for (int i = 0; i < 52; i++) {
-            data.append(BECH32_CHARSET.charAt(random.nextInt(BECH32_CHARSET.length())));
+            data.append(charset.charAt(SECURE_RANDOM.nextInt(charset.length())));
         }
 
         // Calculate and append Bech32 checksum (6 characters)