diff --git a/tests/simulation/run_node.sh b/tests/simulation/run_node.sh
index 4def0a452..8bfdc1356 100755
--- a/tests/simulation/run_node.sh
+++ b/tests/simulation/run_node.sh
@@ -52,7 +52,7 @@ if [[ $NODE_ID == $MASTER_NODE ]]; then
   NODE_BIN=$BOOTSTRAP_NODE_BIN
 fi
 
-$NODE_BIN \
+cd "$DATA_DIR" && $NODE_BIN \
   --bootstrap-file=$BOOTSTRAP_ADDRESS_FILE \
   --data-dir=$DATA_DIR \
   --node-name=$NODE_ID \
diff --git a/tests/simulation/start.sh b/tests/simulation/start.sh
index 3c4d63fd4..7a63946ca 100755
--- a/tests/simulation/start.sh
+++ b/tests/simulation/start.sh
@@ -16,7 +16,7 @@ mkdir -p "$VALIDATORS_DIR"
 
 cd "$GIT_ROOT"
 
-NIMFLAGS="-d:chronicles_log_level=TRACE --hints:off --warnings:off --verbosity:0 --opt:speed --debuginfo"
+NIMFLAGS="-d:chronicles_log_level=TRACE -d:chronicles_sinks:textlines,json[file] --hints:off --warnings:off --verbosity:0 --opt:speed --debuginfo"
 
 # Run with "SLOTS_PER_EPOCH=8 ./start.sh" to change these
 DEFS=""
diff --git a/vendor/nim-libp2p b/vendor/nim-libp2p
index d42833947..7bd305471 160000
--- a/vendor/nim-libp2p
+++ b/vendor/nim-libp2p
@@ -1 +1 @@
-Subproject commit d42833947a4baddf21da8ac3105e2d5956a6daac
+Subproject commit 7bd305471c0ab1a0306e6734915952f236cc88eb