diff --git a/build_sdcard.sh b/build_sdcard.sh
index a515ec466..d31316fcf 100755
--- a/build_sdcard.sh
+++ b/build_sdcard.sh
@@ -827,7 +827,7 @@ echo "*** PREPARING BITCOIN ***"
 
 # set version (change if update is available)
 # https://bitcoincore.org/en/download/
-bitcoinVersion="0.21.0"
+bitcoinVersion="0.21.1"
 
 # needed to check code signing
 laanwjPGP="01EA5486DE18A882D4C2684590C8019E36C2E964"
@@ -839,9 +839,12 @@ cd /home/admin/download
 
 # download, check and import signer key
 sudo -u admin wget https://bitcoin.org/laanwj-releases.asc
+if [ ! -f "laanwj-releases.asc" ];then
+  sudo -u admin wget https://raw.githubusercontent.com/bitcoin-dot-org/Bitcoin.org/master/laanwj-releases.asc
+fi
 if [ ! -f "./laanwj-releases.asc" ]
 then
-  echo "!!! FAIL !!! Download laanwj-releases.asc not success."
+  echo "!!! FAIL !!! Could not download laanwj-releases.asc"
   exit 1
 fi
 gpg --import --import-options show-only ./laanwj-releases.asc
@@ -935,20 +938,16 @@ echo "*** PREPARING LIGHTNING ***"
 # "*** LND ***"
 ## based on https://github.com/Stadicus/guides/blob/master/raspibolt/raspibolt_40_lnd.md#lightning-lnd
 ## see LND releases: https://github.com/lightningnetwork/lnd/releases
-lndVersion="0.12.1-beta"
+lndVersion="0.13.1-beta"
 
 # olaoluwa
-#PGPauthor="roasbeef"
-#PGPpkeys="https://keybase.io/roasbeef/pgp_keys.asc"
-#PGPcheck="9769140D255C759B1EB77B46A96387A57CAAE94D"
+PGPauthor="roasbeef"
+PGPpkeys="https://keybase.io/roasbeef/pgp_keys.asc"
+PGPcheck="E4D85299674B2D31FAA1892E372CBD7633C61696"
 # bitconner
-PGPauthor="bitconner"
-PGPpkeys="https://keybase.io/bitconner/pgp_keys.asc"
-PGPcheck="9C8D61868A7C492003B2744EE7D737B67FA592C7"
-# Joost Jager
-#PGPauthor="joostjager"
-#PGPpkeys="https://keybase.io/joostjager/pgp_keys.asc"
-#PGPcheck="D146D0F68939436268FA9A130E26BB61B76C4D3A"
+#PGPauthor="bitconner"
+#PGPpkeys="https://keybase.io/bitconner/pgp_keys.asc"
+#PGPcheck="9C8D61868A7C492003B2744EE7D737B67FA592C7"
 
 # get LND resources
 cd /home/admin/download
@@ -1058,6 +1057,104 @@ fi
 sudo chown -R admin /home/admin
 echo "- OK install of LND done"
 
+echo "*** C-lightning ***"
+# https://github.com/ElementsProject/lightning/releases
+CLVERSION=0.10.1
+# https://github.com/ElementsProject/lightning/tree/master/contrib/keys
+PGPsigner="rustyrussel"
+PGPpkeys="https://raw.githubusercontent.com/ElementsProject/lightning/master/contrib/keys/rustyrussell.txt"
+PGPcheck="D9200E6CD1ADB8F1"
+
+# prepare download dir
+sudo rm -rf /home/admin/download/cln
+sudo -u admin mkdir -p /home/admin/download/cln
+cd /home/admin/download/cln || exit 1
+
+sudo -u admin wget -O "pgp_keys.asc" ${PGPpkeys}
+gpg --import --import-options show-only ./pgp_keys.asc
+fingerprint=$(gpg "pgp_keys.asc" 2>/dev/null | grep "${PGPcheck}" -c)
+if [ ${fingerprint} -lt 1 ]; then
+  echo
+  echo "!!! WARNING --> the PGP fingerprint is not as expected for ${PGPsigner}"
+  echo "Should contain PGP: ${PGPcheck}"
+  echo "PRESS ENTER to TAKE THE RISK if you think all is OK"
+  read key
+fi
+gpg --import ./pgp_keys.asc
+
+sudo -u admin wget https://github.com/ElementsProject/lightning/releases/download/v${CLVERSION}/SHA256SUMS
+sudo -u admin wget https://github.com/ElementsProject/lightning/releases/download/v${CLVERSION}/SHA256SUMS.asc
+
+verifyResult=$(gpg --verify SHA256SUMS.asc 2>&1)
+
+goodSignature=$(echo ${verifyResult} | grep 'Good signature' -c)
+echo "goodSignature(${goodSignature})"
+correctKey=$(echo ${verifyResult} | tr -d " \t\n\r" | grep "${PGPcheck}" -c)
+echo "correctKey(${correctKey})"
+if [ ${correctKey} -lt 1 ] || [ ${goodSignature} -lt 1 ]; then
+  echo
+  echo "!!! BUILD FAILED --> PGP verification not OK / signature(${goodSignature}) verify(${correctKey})"
+  exit 1
+else
+  echo 
+  echo "****************************************************************"
+  echo "OK --> the PGP signature of the C-lighning SHA256SUMS is correct"
+  echo "****************************************************************"
+  echo 
+fi
+
+sudo -u admin wget https://github.com/ElementsProject/lightning/releases/download/v${CLVERSION}/clightning-v${CLVERSION}.zip
+
+hashCheckResult=$(sha256sum -c SHA256SUMS 2>&1)
+goodHash=$(echo ${hashCheckResult} | grep 'OK' -c)
+echo "goodHash(${goodHash})"
+if [ ${goodHash} -lt 1 ]; then
+  echo
+  echo "!!! BUILD FAILED --> Hash check not OK"
+  exit 1
+else
+  echo
+  echo "********************************************************************"
+  echo "OK --> the hash of the downloaded C-lightning source code is correct"
+  echo "********************************************************************"
+  echo
+fi
+
+echo "- Install build dependencies"
+sudo apt-get install -y \
+  autoconf automake build-essential git libtool libgmp-dev \
+  libsqlite3-dev python3 python3-mako net-tools zlib1g-dev libsodium-dev \
+  gettext unzip
+
+unzip clightning-v${CLVERSION}.zip
+cd clightning-v${CLVERSION} || exit 1
+
+echo "- Configuring EXPERIMENTAL_FEATURES enabled"
+sudo -u admin ./configure --enable-experimental-features
+
+currentCLversion=$(git describe --tags 2>/dev/null)
+echo "- Building from source C-lightning $currentCLversion"
+sudo -u admin make
+
+echo "- Install to /usr/local/bin/"
+sudo make install || exit 1
+
+installed=$(sudo -u admin lightning-cli --version)
+if [ ${#installed} -eq 0 ]; then
+  echo
+  echo "!!! BUILD FAILED --> Was not able to install C-lightning"
+  exit 1
+fi
+
+correctVersion=$(echo "${installed}" | grep -c "${CLVERSION}")
+if [ ${correctVersion} -eq 0 ]; then
+  echo
+  echo "!!! BUILD FAILED --> installed C-lightning is not version ${CLVERSION}"
+  sudo -u admin lightning-cli --version
+  exit 1
+fi
+echo "- OK the installation of C-lightning v${installed} is done"
+
 echo ""
 echo "*** raspiblitz.info ***"
 sudo cat /home/admin/raspiblitz.info