diff --git a/.pkg b/.pkg
index 89a5cce2a..487181922 100644
--- a/.pkg
+++ b/.pkg
@@ -13,7 +13,7 @@
 [utl]
   url=git@github.com:motis-project/utl.git
   branch=master
-  commit=f76f70812be09d88b260e398ddd43fc7345f9fb9
+  commit=9c44a5abcb62c0463df87355e0cb29d90906f0d0
 [adr]
   url=git@github.com:triptix-tech/adr.git
   branch=master
diff --git a/.pkg.lock b/.pkg.lock
index 8e9e05ced..f95e9794e 100644
--- a/.pkg.lock
+++ b/.pkg.lock
@@ -1,11 +1,11 @@
-521520066768043934
+14846770624705372750
 cista 5b6808fd7d7a7c1c7e4cb152b563dbf71e3efba4
 zlib-ng 68ab3e2d80253ec5dc3c83691d9ff70477b32cd3
 boost 73549ebca677fe6214202a1ab580362b4f80e653
 googletest 7b64fca6ea0833628d6f86255a81424365f7cc0c
 libressl 24acd9e710fbe842e863572da9d738715fbc74b8
 fmt dc10f83be70ac2873d5f8d1ce317596f1fd318a2
-utl f76f70812be09d88b260e398ddd43fc7345f9fb9
+utl 9c44a5abcb62c0463df87355e0cb29d90906f0d0
 net 7b089e022471bb5adf716d0c7b0cdb57a23c7adc
 PEGTL 1c1aa6e650e4d26f10fa398f148ec0cdc5f0808d
 res b759b93316afeb529b6cb5b2548b24c41e382fb0
diff --git a/src/server.cc b/src/server.cc
index ba201e11b..0c54c1120 100644
--- a/src/server.cc
+++ b/src/server.cc
@@ -1,11 +1,15 @@
 #include "boost/asio/io_context.hpp"
 
+#include "fmt/format.h"
+
 #include "net/run.h"
 #include "net/stop_handler.h"
 #include "net/web_server/query_router.h"
 #include "net/web_server/web_server.h"
 
+#include "utl/enumerate.h"
 #include "utl/init_from.h"
+#include "utl/set_thread_name.h"
 
 #include "motis/config.h"
 #include "motis/endpoints/adr/geocode.h"
@@ -97,6 +101,7 @@ int server(data d, config const& c) {
   if (c.requires_rt_timetable_updates()) {
     rt_update_ioc = std::make_unique<asio::io_context>();
     rt_update_thread = std::make_unique<std::thread>([&]() {
+      utl::set_current_thread_name("rt update");
       run_rt_update(*rt_update_ioc, c, *d.tt_, *d.tags_, d.rt_);
       rt_update_ioc->run();
     });
@@ -107,6 +112,7 @@ int server(data d, config const& c) {
   if (d.w_ && d.l_ && c.has_gbfs_feeds()) {
     gbfs_update_ioc = std::make_unique<asio::io_context>();
     gbfs_update_thread = std::make_unique<std::thread>([&]() {
+      utl::set_current_thread_name("gbfs update");
       gbfs::run_gbfs_update(*gbfs_update_ioc, c, *d.w_, *d.l_, d.gbfs_);
       gbfs_update_ioc->run();
     });
@@ -115,8 +121,9 @@ int server(data d, config const& c) {
   auto const work_guard = asio::make_work_guard(workers);
   auto threads = std::vector<std::thread>(
       static_cast<unsigned>(std::max(1U, server_config.n_threads_)));
-  for (auto& t : threads) {
+  for (auto [i, t] : utl::enumerate(threads)) {
     t = std::thread(net::run(workers));
+    utl::set_thread_name(t, fmt::format("worker {}", i));
   }
 
   auto const stop = net::stop_handler(ioc, [&]() {