diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36157e6..568db15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1] - 2025-11-22
+
+### Fixed
+
+- Compilation warnings for unused parameters in `Layer` class
+- `nodiscard` warning in `TestApplication` tests
+- Enabled stricter warning flags (`/W4` for MSVC, `-Wall -Wextra -Wpedantic -Werror` for others) in CMake build system
+
 ## [0.5.0] - 2025-11-15
 
 ### Added
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7202acb..0269603 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,6 +76,12 @@ target_link_libraries(Kappa PUBLIC
 
 target_compile_features(Kappa PUBLIC cxx_std_20)
 
+if(MSVC)
+    target_compile_options(Kappa PRIVATE /W4)
+else()
+    target_compile_options(Kappa PRIVATE -Wall -Wextra -Wpedantic -Werror)
+endif()
+
 # Setup code quality targets and IDE integration
 kappa_add_code_quality_targets()
 kappa_setup_ide_integration()
diff --git a/include/Layer.h b/include/Layer.h
index d110a0e..39589f0 100644
--- a/include/Layer.h
+++ b/include/Layer.h
@@ -19,7 +19,7 @@ namespace Kappa
          * @brief Called when an event occurs.
          * @param event Event to handle
          */
-        virtual void OnEvent(Event &event)
+        virtual void OnEvent([[maybe_unused]] Event &event)
         {
         }
 
@@ -27,7 +27,7 @@ namespace Kappa
          * @brief Called every frame to update the layer.
          * @param deltaTime Time elapsed since last update
          */
-        virtual void OnUpdate(float deltaTime)
+        virtual void OnUpdate([[maybe_unused]] float deltaTime)
         {
         }
 
diff --git a/tests/TestApplication.cpp b/tests/TestApplication.cpp
index b4e2afc..a000d2a 100644
--- a/tests/TestApplication.cpp
+++ b/tests/TestApplication.cpp
@@ -233,7 +233,7 @@ TEST_F(ApplicationTest, ApplicationHasEventBus)
 {
     TestApplication app(spec);
 
-    EXPECT_NO_THROW(app.GetEventBus());
+    EXPECT_NO_THROW(static_cast<void>(app.GetEventBus()));
 }
 
 // ============================================================================