diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f2827c..bf9053b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,10 +34,8 @@ set(dependencies
     esp_hw_support
     esp_websocket_client
     tcp_transport
-
     cpputils
     espchrono
-    fmt
 )
 
 idf_component_register(
diff --git a/src/espstrutils.cpp b/src/espstrutils.cpp
index 684689a..1a7a377 100644
--- a/src/espstrutils.cpp
+++ b/src/espstrutils.cpp
@@ -5,13 +5,11 @@
 
 // system includes
 #include <utility>
+#include <format>
 
 // esp-idf includes
 #include <esp_log.h>
 
-// 3rdparty lib includes
-#include <fmt/core.h>
-
 using namespace std::string_literals;
 
 namespace espcpputils {
@@ -27,7 +25,7 @@ std::string toString(sntp_sync_mode_t val)
     case SNTP_SYNC_MODE_SMOOTH: return "SMOOTH";
     default:
         ESP_LOGW(TAG, "unknown sntp_sync_mode_t(%i)", std::to_underlying(val));
-        return fmt::format("Unknown sntp_sync_mode_t({})", std::to_underlying(val));
+        return std::format("Unknown sntp_sync_mode_t({})", std::to_underlying(val));
     }
 }
 
@@ -40,7 +38,7 @@ std::string toString(sntp_sync_status_t val)
     case SNTP_SYNC_STATUS_IN_PROGRESS: return "IN_PROGRESS";
     default:
         ESP_LOGW(TAG, "unknown sntp_sync_status_t(%i)", std::to_underlying(val));
-        return fmt::format("Unknown sntp_sync_status_t({})", std::to_underlying(val));
+        return std::format("Unknown sntp_sync_status_t({})", std::to_underlying(val));
     }
 }
 
@@ -56,7 +54,7 @@ std::string toString(esp_log_level_t val)
     case ESP_LOG_VERBOSE: return "VERBOSE";
     default:
         ESP_LOGW(TAG, "unknown esp_log_level_t(%i)", std::to_underlying(val));
-        return fmt::format("Unknown esp_log_level_t({})", std::to_underlying(val));
+        return std::format("Unknown esp_log_level_t({})", std::to_underlying(val));
     }
 }
 
@@ -77,7 +75,7 @@ std::string toString(esp_reset_reason_t val)
     case ESP_RST_SDIO:      return "SDIO";
     default:
         ESP_LOGW(TAG, "unknown esp_reset_reason_t(%i)", std::to_underlying(val));
-        return fmt::format("Unknown esp_reset_reason_t({})", std::to_underlying(val));
+        return std::format("Unknown esp_reset_reason_t({})", std::to_underlying(val));
     }
 }