diff --git a/conanfile.txt b/conanfile.txt
index f7c88b83..ef6b957a 100644
--- a/conanfile.txt
+++ b/conanfile.txt
@@ -1,17 +1,17 @@
 [requires]
-cli11/2.1.1
-date/2.4.1
-eigen/3.3.9
+cli11/2.1.2
+date/3.0.1
+eigen/3.4.0
 gtest/1.10.0
-h5cpp/0.4.1@ess-dmsc/testing
-nlohmann_json/3.9.1
-librdkafka/1.6.0
+fmt/8.1.1
+librdkafka/1.8.2
+nlohmann_json/3.10.5
+spdlog/1.9.2
+h5cpp/0.4.1@ess-dmsc/stable
 logical-geometry/705ea61@ess-dmsc/stable
-qplot/6e192ab@ess-dmsc/testing
-Qt-Color-Widgets/9f4e052@ess-dmsc/testing
+qplot/6e192ab@ess-dmsc/stable
+Qt-Color-Widgets/9f4e052@ess-dmsc/stable
 streaming-data-types/6a41aee@ess-dmsc/stable
-spdlog/1.3.1@bincrafters/stable
-fmt/5.3.0@bincrafters/stable
 
 [generators]
 cmake
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 15e6630b..a1545dac 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -3,9 +3,9 @@ include(BuildInfo)
 
 find_package(date REQUIRED)
 find_package(fmt REQUIRED)
+find_package(spdlog REQUIRED)
 find_package(h5cpp 0.4.0 REQUIRED)
 find_package(Threads REQUIRED)
-add_definitions("-DGRAYLOG")
 
 add_subdirectory(core)
 add_subdirectory(consumers)
diff --git a/source/core/CMakeLists.txt b/source/core/CMakeLists.txt
index 73c5ddfb..a9f979b0 100644
--- a/source/core/CMakeLists.txt
+++ b/source/core/CMakeLists.txt
@@ -58,9 +58,9 @@ target_include_directories(
 target_link_libraries(
   ${this_target}
   PUBLIC ${COVERAGE_LIBRARIES}
-  PUBLIC ${GraylogLogger_STATIC_LIBRARIES}
   PUBLIC h5cpp::h5cpp
   PUBLIC fmt::fmt
+  PUBLIC spdlog::spdlog
   PUBLIC ${DATE_LIBRARIES}
   PRIVATE Threads::Threads
 )
diff --git a/source/core/util/logger.cpp b/source/core/util/logger.cpp
index 103e5f20..e5c619c0 100644
--- a/source/core/util/logger.cpp
+++ b/source/core/util/logger.cpp
@@ -15,14 +15,14 @@ template<typename Mutex>
 class ostream_sink final : public spdlog::sinks::base_sink<Mutex>
 {
  public:
-  ostream_sink(std::ostream* gui_stream)
+  explicit ostream_sink(std::ostream* gui_stream)
       : outStream(gui_stream)
   {}
 
  protected:
   void sink_it_(const spdlog::details::log_msg& msg) override
   {
-    fmt::memory_buffer formatted;
+    spdlog::memory_buf_t formatted;
     spdlog::sinks::base_sink<Mutex>::formatter_->format(msg, formatted);
     (*outStream) << fmt::to_string(formatted);
   }