diff --git a/decoding-bitcoin/README.md b/decoding-bitcoin/README.md
index ed1974a..6540264 100644
--- a/decoding-bitcoin/README.md
+++ b/decoding-bitcoin/README.md
@@ -82,7 +82,7 @@ Decoding Bitcoin is Code Orange Dev School's flagship developer program. Over 8
 **Readings:**
 - Mastering Bitcoin, Chapter 6 (Transactions)
 - [Learn Bitcoin from the Command Line: Chapter 4](https://github.com/BlockchainCommons/Learning-Bitcoin-from-the-Command-Line)
-- [Bitcoin Optech: Transaction Structure](https://bitcoinops.org/en/topics/transaction-format/)
+- [learnmeabitcoin: Transaction Structure](https://learnmeabitcoin.com/technical/transaction/)
 
 **Exercises:**
 1. Create a raw transaction using `createrawtransaction`, sign it with `signrawtransactionwithwallet`, and broadcast with `sendrawtransaction`
@@ -130,7 +130,7 @@ Decoding Bitcoin is Code Orange Dev School's flagship developer program. Over 8
 **Readings:**
 - Mastering Bitcoin, Chapter 12 (SegWit)
 - [BIP 141](https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki), [BIP 143](https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki)
-- [Bitcoin Optech: SegWit](https://bitcoinops.org/en/topics/segwit/)
+- [Bitcoin Optech: Segregated Witness](https://bitcoinops.org/en/topics/segregated-witness/)
 
 **Exercises:**
 1. Create and compare legacy (P2PKH) vs native SegWit (P2WPKH) transactions on regtest - compare sizes and fees
diff --git a/resources/reading-list.md b/resources/reading-list.md
index 48abdc6..f2d04b6 100644
--- a/resources/reading-list.md
+++ b/resources/reading-list.md
@@ -18,7 +18,7 @@
 
 - [Bitcoin Optech Newsletter](https://bitcoinops.org/) - Weekly technical updates
 - [Bitcoin Core PR Review Club](https://bitcoincore.reviews/) - Weekly PR review sessions
-- [Bitcoin Dev Mailing List](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/) - Protocol development discussion
+- [Bitcoin Dev Mailing List](https://groups.google.com/g/bitcoindev) - Protocol development discussion (moved from the Linux Foundation list in 2024)
 
 ## BIPs (Bitcoin Improvement Proposals)