diff --git a/conanfile.txt b/conanfile.txt
index a36eeb58..f82c46a4 100644
--- a/conanfile.txt
+++ b/conanfile.txt
@@ -1,6 +1,6 @@
 [requires]
-fmt/8.1.1
-spdlog/1.10.0
+fmt/9.1.0
+spdlog/1.11.0
 catch2/2.13.7
 fakeit/2.0.9
 cli11/2.3.2
diff --git a/src/crayg/src/basics/BoundingBox.h b/src/crayg/src/basics/BoundingBox.h
index c6bf6824..daabc1ed 100644
--- a/src/crayg/src/basics/BoundingBox.h
+++ b/src/crayg/src/basics/BoundingBox.h
@@ -3,6 +3,7 @@
 
 #include "Ray.h"
 #include "Vector3f.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -32,4 +33,6 @@ class BoundingBox {
 
 }
 
+template <> struct fmt::formatter<crayg::BoundingBox> : ostream_formatter {};
+
 #endif // CRAYG_BOUNDINGBOX_H
diff --git a/src/crayg/src/basics/Color.h b/src/crayg/src/basics/Color.h
index 656e6bcd..869b2072 100644
--- a/src/crayg/src/basics/Color.h
+++ b/src/crayg/src/basics/Color.h
@@ -1,6 +1,7 @@
 #ifndef CRAYG_COLOR_H
 #define CRAYG_COLOR_H
 
+#include <fmt/ostream.h>
 #include <ostream>
 #include <tuple>
 
@@ -55,4 +56,7 @@ class Color {
 };
 
 } // namespace crayg
+
+template <> struct fmt::formatter<crayg::Color> : ostream_formatter {};
+
 #endif // CRAYG_COLOR_H
diff --git a/src/crayg/src/basics/Gradient.h b/src/crayg/src/basics/Gradient.h
index 00d631cf..5adaec42 100644
--- a/src/crayg/src/basics/Gradient.h
+++ b/src/crayg/src/basics/Gradient.h
@@ -4,6 +4,7 @@
 #include "Color.h"
 #include "utils/ToStringHelper.h"
 #include <fmt/format.h>
+#include <fmt/ostream.h>
 #include <ostream>
 #include <vector>
 
@@ -85,4 +86,8 @@ template <typename T> T Gradient<T>::lerp(const T &firstValue, const T &secondVa
 
 } // crayg
 
+template <typename T> struct fmt::formatter<crayg::Gradient<T>> : ostream_formatter {};
+
+template <typename T> struct fmt::formatter<crayg::GradientStop<T>> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_GRADIENT_H_
diff --git a/src/crayg/src/basics/Matrix4x4f.h b/src/crayg/src/basics/Matrix4x4f.h
index b2096044..57f3cfb7 100644
--- a/src/crayg/src/basics/Matrix4x4f.h
+++ b/src/crayg/src/basics/Matrix4x4f.h
@@ -2,6 +2,7 @@
 #define CRAYG_SRC_CRAYG_SRC_BASICS_MATRIX4X4F_H_
 
 #include "Vector3f.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -32,4 +33,7 @@ class Matrix4x4f {
 };
 
 }
+
+template <> struct fmt::formatter<crayg::Matrix4x4f> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_MATRIX4X4F_H_
diff --git a/src/crayg/src/basics/OrthonormalBasis.h b/src/crayg/src/basics/OrthonormalBasis.h
index a743e1d4..c413939e 100644
--- a/src/crayg/src/basics/OrthonormalBasis.h
+++ b/src/crayg/src/basics/OrthonormalBasis.h
@@ -3,6 +3,7 @@
 
 #include "Vector3f.h"
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -30,4 +31,6 @@ class OrthonormalBasis {
 
 } // crayg
 
+template <> struct fmt::formatter<crayg::OrthonormalBasis> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_ORTHONORMALBASIS_H_
diff --git a/src/crayg/src/basics/Ray.h b/src/crayg/src/basics/Ray.h
index be5500bf..8d6d8749 100644
--- a/src/crayg/src/basics/Ray.h
+++ b/src/crayg/src/basics/Ray.h
@@ -2,6 +2,7 @@
 #define CRAYG_RAY_H
 
 #include "Vector3f.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -32,4 +33,6 @@ struct Ray {
 
 }
 
+template <> struct fmt::formatter<crayg::Ray> : ostream_formatter {};
+
 #endif // CRAYG_RAY_H
diff --git a/src/crayg/src/basics/Resolution.h b/src/crayg/src/basics/Resolution.h
index f7cbadab..749f885e 100644
--- a/src/crayg/src/basics/Resolution.h
+++ b/src/crayg/src/basics/Resolution.h
@@ -1,6 +1,7 @@
 #ifndef CRAYG_SRC_CRAYG_SRC_BASICS_RESOLUTION_H_
 #define CRAYG_SRC_CRAYG_SRC_BASICS_RESOLUTION_H_
 
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -27,4 +28,6 @@ struct Resolution {
 
 }
 
+template <> struct fmt::formatter<crayg::Resolution> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_RESOLUTION_H_
diff --git a/src/crayg/src/basics/Transform.h b/src/crayg/src/basics/Transform.h
index 5dc38106..90c91791 100644
--- a/src/crayg/src/basics/Transform.h
+++ b/src/crayg/src/basics/Transform.h
@@ -3,6 +3,7 @@
 
 #include "Matrix4x4f.h"
 #include "Ray.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -32,4 +33,6 @@ class Transform {
 
 }
 
+template <> struct fmt::formatter<crayg::Transform> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_TRANSFORM_H_
diff --git a/src/crayg/src/basics/Vector2.h b/src/crayg/src/basics/Vector2.h
index b74adb77..1cf13aeb 100644
--- a/src/crayg/src/basics/Vector2.h
+++ b/src/crayg/src/basics/Vector2.h
@@ -2,6 +2,7 @@
 #define CRAYG_SRC_CRAYG_SRC_BASICS_VECTOR2_H_
 
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -53,4 +54,6 @@ typedef Vector2<int> Vector2i;
 
 }
 
+template <typename T> struct fmt::formatter<crayg::Vector2<T>> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_VECTOR2_H_
diff --git a/src/crayg/src/basics/Vector3f.h b/src/crayg/src/basics/Vector3f.h
index a8cdc827..cddac288 100644
--- a/src/crayg/src/basics/Vector3f.h
+++ b/src/crayg/src/basics/Vector3f.h
@@ -2,6 +2,7 @@
 #define CRAYG_VECTOR3F_H
 
 #include <cmath>
+#include <fmt/ostream.h>
 #include <limits>
 #include <ostream>
 
@@ -49,4 +50,7 @@ class Vector3f {
 };
 
 }
+
+template <> struct fmt::formatter<crayg::Vector3f> : ostream_formatter {};
+
 #endif // CRAYG_VECTOR3F_H
diff --git a/src/crayg/src/image/ImageBucket.h b/src/crayg/src/image/ImageBucket.h
index 5fe6f849..4c59d5a9 100644
--- a/src/crayg/src/image/ImageBucket.h
+++ b/src/crayg/src/image/ImageBucket.h
@@ -2,6 +2,7 @@
 #define CRAYG_SRC_CRAYG_SRC_IMAGE_IMAGEBUCKET_H_
 
 #include "basics/Vector2.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -32,4 +33,6 @@ template <> struct hash<crayg::ImageBucket> {
 };
 }
 
+template <> struct fmt::formatter<crayg::ImageBucket> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_IMAGE_IMAGEBUCKET_H_
diff --git a/src/crayg/src/image/PixelBuffer.h b/src/crayg/src/image/PixelBuffer.h
index 31327d80..8996b848 100644
--- a/src/crayg/src/image/PixelBuffer.h
+++ b/src/crayg/src/image/PixelBuffer.h
@@ -5,6 +5,7 @@
 #include "basics/Color.h"
 #include "basics/Resolution.h"
 #include "basics/Vector2.h"
+#include <fmt/ostream.h>
 #include <memory>
 #include <ostream>
 #include <variant>
@@ -51,4 +52,6 @@ class PixelBuffer {
 
 } // crayg
 
+template <> struct fmt::formatter<crayg::PixelBuffer> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_IMAGE_PIXELBUFFER_H_
diff --git a/src/crayg/src/integrators/IntegratorSettings.h b/src/crayg/src/integrators/IntegratorSettings.h
index 97f05a52..baf41f7b 100644
--- a/src/crayg/src/integrators/IntegratorSettings.h
+++ b/src/crayg/src/integrators/IntegratorSettings.h
@@ -1,5 +1,6 @@
 #ifndef CRAYG_SRC_CRAYG_SRC_INTEGRATORS_INTEGRATORSETTINGS_H_
 #define CRAYG_SRC_CRAYG_SRC_INTEGRATORS_INTEGRATORSETTINGS_H_
+#include <fmt/ostream.h>
 #include <ostream>
 #include <unordered_map>
 #include <variant>
@@ -22,4 +23,6 @@ class IntegratorSettings {
 
 } // crayg
 
+template <> struct fmt::formatter<crayg::IntegratorSettings> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_INTEGRATORS_INTEGRATORSETTINGS_H_
diff --git a/src/crayg/src/scene/camera/Camera.h b/src/crayg/src/scene/camera/Camera.h
index 9e872ee0..594f82d2 100644
--- a/src/crayg/src/scene/camera/Camera.h
+++ b/src/crayg/src/scene/camera/Camera.h
@@ -5,6 +5,7 @@
 #include "scene/Transformable.h"
 #include "spdlog/fmt/ostr.h"
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -51,4 +52,7 @@ class Camera : public Transformable {
 };
 
 }
+
+template <> struct fmt::formatter<crayg::Camera> : ostream_formatter {};
+
 #endif // CRAYG_CAMERA_H
diff --git a/src/crayg/src/scene/lights/Light.h b/src/crayg/src/scene/lights/Light.h
index a75160cb..5ed8b358 100644
--- a/src/crayg/src/scene/lights/Light.h
+++ b/src/crayg/src/scene/lights/Light.h
@@ -45,4 +45,7 @@ class Light : public Transformable, public Imageable {
 };
 
 }
+
+template <> struct fmt::formatter<crayg::Light::Radiance> : ostream_formatter {};
+
 #endif // CRAYG_L
\ No newline at end of file
diff --git a/src/crayg/src/scene/primitives/trianglemesh/BarycentricCoordinates.h b/src/crayg/src/scene/primitives/trianglemesh/BarycentricCoordinates.h
index bbbbb9fc..9e13cf7e 100644
--- a/src/crayg/src/scene/primitives/trianglemesh/BarycentricCoordinates.h
+++ b/src/crayg/src/scene/primitives/trianglemesh/BarycentricCoordinates.h
@@ -2,6 +2,7 @@
 #define CRAYG_SRC_CRAYG_SRC_BASICS_BARYCENTRICCOORDINATES_H_
 
 #include "scene/primitives/trianglemesh/Triangle.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -28,4 +29,6 @@ template <typename T> T BarycentricCoordinates::interpolateLinear(const T &value
 
 } // crayg
 
+template <> struct fmt::formatter<crayg::BarycentricCoordinates> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_BASICS_BARYCENTRICCOORDINATES_H_
diff --git a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerFacePrimVar.h b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerFacePrimVar.h
index 039d88bf..5f3a5eb6 100644
--- a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerFacePrimVar.h
+++ b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerFacePrimVar.h
@@ -4,6 +4,7 @@
 #include "TriangleMeshAbstractPrimVar.h"
 #include "scene/primitives/trianglemesh/BarycentricCoordinates.h"
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -58,4 +59,6 @@ template <typename T> class TriangleMeshPerFacePrimVar : public TriangleMeshAbst
 };
 }
 
+template <typename T> struct fmt::formatter<crayg::TriangleMeshPerFacePrimVar<T>> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_SCENE_TRIANGLEMESHPERFACEPRIMVAR_H_
diff --git a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerPointPrimVar.h b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerPointPrimVar.h
index 5d82bdb4..d7141504 100644
--- a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerPointPrimVar.h
+++ b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerPointPrimVar.h
@@ -4,6 +4,7 @@
 #include "TriangleMeshAbstractPrimVar.h"
 #include "scene/primitives/trianglemesh/BarycentricCoordinates.h"
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 
 namespace crayg {
 
@@ -41,7 +42,7 @@ template <typename T> class TriangleMeshPerPointPrimVar : public TriangleMeshAbs
     }
 
     template <typename OStream>
-    friend std::ostream &operator<<(std::ostream &os, const TriangleMeshPerPointPrimVar &var) {
+    friend std::ostream &operator<<(std::ostream &os, const TriangleMeshPerPointPrimVar<T> &var) {
         os << ToStringHelper("TriangleMeshPerPointPrimVar").addMember("pointData", var.pointData).finish();
         return os;
     }
@@ -64,4 +65,6 @@ template <typename T> class TriangleMeshPerPointPrimVar : public TriangleMeshAbs
 
 } // crayg
 
+template <typename T> struct fmt::formatter<crayg::TriangleMeshPerPointPrimVar<T>> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_SCENE_TRIANGLEMESHPERPOINTPRIMVAR_H_
diff --git a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerVertexPrimVar.h b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerVertexPrimVar.h
index 9b32b41b..e3c8e55a 100644
--- a/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerVertexPrimVar.h
+++ b/src/crayg/src/scene/primitives/trianglemesh/primvars/TriangleMeshPerVertexPrimVar.h
@@ -4,6 +4,7 @@
 #include "TriangleMeshAbstractPrimVar.h"
 #include "scene/primitives/trianglemesh/BarycentricCoordinates.h"
 #include "utils/ToStringHelper.h"
+#include <fmt/ostream.h>
 #include <ostream>
 
 namespace crayg {
@@ -74,7 +75,7 @@ template <typename T> class TriangleMeshPerVertexPrimVar : public TriangleMeshAb
     }
 
     template <typename OStream>
-    friend std::ostream &operator<<(std::ostream &os, const TriangleMeshPerVertexPrimVar &var) {
+    friend std::ostream &operator<<(std::ostream &os, const TriangleMeshPerVertexPrimVar<T> &var) {
         os << ToStringHelper("TriangleMeshPerVertexPrimVar").addMember("vertexData", var.vertexData).finish();
         return os;
     }
@@ -96,4 +97,8 @@ template <typename T> class TriangleMeshPerVertexPrimVar : public TriangleMeshAb
 };
 }
 
+template <typename T> struct fmt::formatter<crayg::VertexData<T>> : ostream_formatter {};
+
+template <typename T> struct fmt::formatter<crayg::TriangleMeshPerVertexPrimVar<T>> : ostream_formatter {};
+
 #endif // CRAYG_SRC_CRAYG_SRC_SCENE_TRIANGLEMESHPERVERTEXPRIMVAR_H_
diff --git a/src/crayg/src/sceneIO/usd/CraygUsdBase.h b/src/crayg/src/sceneIO/usd/CraygUsdBase.h
index 36e2f76d..8596b7be 100644
--- a/src/crayg/src/sceneIO/usd/CraygUsdBase.h
+++ b/src/crayg/src/sceneIO/usd/CraygUsdBase.h
@@ -3,6 +3,7 @@
 #include <fmt/format.h>
 #include <pxr/base/tf/token.h>
 #include <pxr/usd/sdf/path.h>
+#include <pxr/usd/sdf/valueTypeName.h>
 
 template <> struct fmt::formatter<pxr::TfToken> {
     template <typename ParseContext> constexpr auto parse(ParseContext &ctx) {
@@ -24,4 +25,14 @@ template <> struct fmt::formatter<pxr::SdfPath> {
     };
 };
 
+template <> struct fmt::formatter<pxr::SdfValueTypeName> {
+    template <typename ParseContext> constexpr auto parse(ParseContext &ctx) {
+        return ctx.begin();
+    }
+
+    template <typename FormatContext> auto format(pxr::SdfValueTypeName const &sdfValueTypeName, FormatContext &ctx) {
+        return fmt::format_to(ctx.out(), sdfValueTypeName.GetAsToken().GetString());
+    };
+};
+
 #endif // CRAYG_SRC_CRAYGUSD_SRC_CRAYGUSDBASE_H_
diff --git a/src/crayg/src/utils/DtoUtils.h b/src/crayg/src/utils/DtoUtils.h
index 06673434..20399623 100644
--- a/src/crayg/src/utils/DtoUtils.h
+++ b/src/crayg/src/utils/DtoUtils.h
@@ -11,7 +11,8 @@
     template <> struct fmt::formatter<std::vector<crayg::Name>> {                                                      \
         template <typename ParseContext> constexpr auto parse(ParseContext &ctx) { return ctx.begin(); }               \
                                                                                                                        \
-        template <typename FormatContext> auto format(std::vector<crayg::Name> const &dtos, FormatContext &ctx) {      \
+        template <typename FormatContext>                                                                              \
+        auto format(std::vector<crayg::Name> const &dtos, FormatContext &ctx) const {                                  \
             return fmt::format_to(ctx.out(), "[{}]", fmt::join(dtos, ", "));                                           \
         };                                                                                                             \
     };
@@ -38,7 +39,7 @@
     template <> struct fmt::formatter<crayg::Name> {                                                                   \
         template <typename ParseContext> constexpr auto parse(ParseContext &ctx) { return ctx.begin(); }               \
                                                                                                                        \
-        template <typename FormatContext> auto format(crayg::Name const &dto, FormatContext &ctx) {                    \
+        template <typename FormatContext> auto format(crayg::Name const &dto, FormatContext &ctx) const {              \
             return fmt::format_to(ctx.out(), "{}{{{}={},{}={}}}", #Name, #FirstName, dto.FirstName, #SecondName,       \
                                   dto.SecondName);                                                                     \
         };                                                                                                             \
@@ -72,7 +73,7 @@
     template <> struct fmt::formatter<crayg::Name> {                                                                   \
         template <typename ParseContext> constexpr auto parse(ParseContext &ctx) { return ctx.begin(); }               \
                                                                                                                        \
-        template <typename FormatContext> auto format(crayg::Name const &dto, FormatContext &ctx) {                    \
+        template <typename FormatContext> auto format(crayg::Name const &dto, FormatContext &ctx) const {              \
             return fmt::format_to(ctx.out(), "{}{{{}={},{}={},{}={}}}", #Name, #FirstName, dto.FirstName, #SecondName, \
                                   dto.SecondName, #ThirdName, dto.ThirdName);                                          \
         };                                                                                                             \
diff --git a/src/standalonegui/widgets/PanAndZoomArea.h b/src/standalonegui/widgets/PanAndZoomArea.h
index ef2b1e7c..5331b56d 100644
--- a/src/standalonegui/widgets/PanAndZoomArea.h
+++ b/src/standalonegui/widgets/PanAndZoomArea.h
@@ -55,4 +55,6 @@ class PanAndZoomArea : public QScrollArea {
 
 } // crayg
 
+template <> struct fmt::formatter<crayg::ZoomFactor> : ostream_formatter {};
+
 #endif // CRAYG_SRC_STANDALONEGUI_PANANDZOOMAREA_H_