diff --git a/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowSettings.h b/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowSettings.h
index c6c5e6c8..f523b35d 100644
--- a/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowSettings.h
+++ b/engine/include/XCEngine/Rendering/Shadow/DirectionalShadowSettings.h
@@ -6,14 +6,18 @@ namespace XCEngine {
 namespace Rendering {
 
 struct DirectionalShadowSamplingSettings {
-    float receiverDepthBias = 0.0015f;
-    float normalBiasScale = 1.5f;
+    // Keep receiver bias modest and rely more on caster / normal bias so
+    // contact shadows do not detach too aggressively.
+    float receiverDepthBias = 0.0010f;
+    float normalBiasScale = 2.0f;
     float shadowStrength = 0.85f;
 };
 
 struct DirectionalShadowCasterBiasSettings {
-    float depthBiasFactor = 1.0f;
-    int32_t depthBiasUnits = 2;
+    // Single-map directional shadows need a stronger raster bias baseline than
+    // the previous placeholder values to keep acne under control.
+    float depthBiasFactor = 2.5f;
+    int32_t depthBiasUnits = 4;
 };
 
 } // namespace Rendering
diff --git a/tests/Rendering/unit/test_camera_scene_renderer.cpp b/tests/Rendering/unit/test_camera_scene_renderer.cpp
index 538aa47c..967e9be0 100644
--- a/tests/Rendering/unit/test_camera_scene_renderer.cpp
+++ b/tests/Rendering/unit/test_camera_scene_renderer.cpp
@@ -1340,7 +1340,7 @@ TEST(CameraRenderer_Test, AutoAllocatesDirectionalShadowSurfaceFromShadowPlan) {
         EXPECT_FLOAT_EQ(pipelineState->lastShadowViewProjection.m[0][3], 11.0f);
         EXPECT_FLOAT_EQ(pipelineState->lastShadowViewProjection.m[1][3], 12.0f);
         EXPECT_FLOAT_EQ(pipelineState->lastShadowViewProjection.m[2][3], 13.0f);
-        EXPECT_FLOAT_EQ(pipelineState->lastShadowSampling.settings.receiverDepthBias, 0.0015f);
+        EXPECT_FLOAT_EQ(pipelineState->lastShadowSampling.settings.receiverDepthBias, 0.0010f);
         EXPECT_FLOAT_EQ(pipelineState->lastShadowMapMetrics.inverseMapSize.x, 1.0f / 256.0f);
         EXPECT_FLOAT_EQ(pipelineState->lastShadowMapMetrics.inverseMapSize.y, 1.0f / 128.0f);
         EXPECT_FLOAT_EQ(pipelineState->lastShadowSampling.settings.shadowStrength, 0.85f);
diff --git a/tests/Rendering/unit/test_scene_render_request_planner.cpp b/tests/Rendering/unit/test_scene_render_request_planner.cpp
index dadb6ae7..20b02979 100644
--- a/tests/Rendering/unit/test_scene_render_request_planner.cpp
+++ b/tests/Rendering/unit/test_scene_render_request_planner.cpp
@@ -285,9 +285,9 @@ TEST(SceneRenderRequestPlanner_Test, SanitizesInvalidDirectionalShadowPlanningSe
     EXPECT_FLOAT_EQ(settings.minDepthRange, 20.0f);
     EXPECT_FLOAT_EQ(settings.boundsPadding, 1.0f);
     EXPECT_FLOAT_EQ(settings.minDepthPadding, 2.0f);
-    EXPECT_FLOAT_EQ(settings.sampling.receiverDepthBias, 0.0015f);
-    EXPECT_FLOAT_EQ(settings.sampling.normalBiasScale, 1.5f);
+    EXPECT_FLOAT_EQ(settings.sampling.receiverDepthBias, 0.0010f);
+    EXPECT_FLOAT_EQ(settings.sampling.normalBiasScale, 2.0f);
     EXPECT_FLOAT_EQ(settings.sampling.shadowStrength, 1.0f);
-    EXPECT_FLOAT_EQ(settings.casterBias.depthBiasFactor, 1.0f);
-    EXPECT_EQ(settings.casterBias.depthBiasUnits, 2);
+    EXPECT_FLOAT_EQ(settings.casterBias.depthBiasFactor, 2.5f);
+    EXPECT_EQ(settings.casterBias.depthBiasUnits, 4);
 }