diff --git a/app/streaming/session.cpp b/app/streaming/session.cpp
index 01f632f3..23a77b2a 100644
--- a/app/streaming/session.cpp
+++ b/app/streaming/session.cpp
@@ -45,7 +45,8 @@ CONNECTION_LISTENER_CALLBACKS Session::k_ConnCallbacks = {
     Session::clConnectionTerminated,
     Session::clLogMessage,
     Session::clRumble,
-    Session::clConnectionStatusUpdate
+    Session::clConnectionStatusUpdate,
+    Session::clSetHdrMode,
 };
 
 Session* Session::s_ActiveSession;
@@ -175,6 +176,20 @@ void Session::clConnectionStatusUpdate(int connectionStatus)
     }
 }
 
+void Session::clSetHdrMode(bool enabled)
+{
+    // If we're in the process of recreating our decoder when we get
+    // this callback, we'll drop it. The main thread will make the
+    // callback when it finishes creating the new decoder.
+    if (SDL_AtomicTryLock(&s_ActiveSession->m_DecoderLock)) {
+        IVideoDecoder* decoder = s_ActiveSession->m_VideoDecoder;
+        if (decoder != nullptr) {
+            decoder->setHdrMode(enabled);
+        }
+        SDL_AtomicUnlock(&s_ActiveSession->m_DecoderLock);
+    }
+}
+
 bool Session::chooseDecoder(StreamingPreferences::VideoDecoderSelection vds,
                             SDL_Window* window, int videoFormat, int width, int height,
                             int frameRate, bool enableVsync, bool enableFramePacing, bool testOnly, IVideoDecoder*& chosenDecoder)
@@ -195,6 +210,10 @@ bool Session::chooseDecoder(StreamingPreferences::VideoDecoderSelection vds,
     params.enableFramePacing = enableFramePacing;
     params.vds = vds;
 
+    memset(&params.hdrMetadata, 0, sizeof(params.hdrMetadata));
+    params.hdrMetadata.eotf = 2; // SMPTE ST 2084
+    params.hdrMetadata.staticMetadataDescriptorId = 0; // Static Metadata Type 1
+
     SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                 "V-sync %s",
                 enableVsync ? "enabled" : "disabled");
@@ -607,8 +626,6 @@ void Session::emitLaunchWarning(QString text)
 
 bool Session::validateLaunch(SDL_Window* testWindow)
 {
-    QStringList warningList;
-
     if (!m_Computer->isSupportedServerVersion) {
         emit displayLaunchError(tr("The version of GeForce Experience on %1 is not supported by this build of Moonlight. You must update Moonlight to stream from %1.").arg(m_Computer->name));
         return false;
@@ -1640,6 +1657,10 @@ void Session::execInternal()
             // Request an IDR frame to complete the reset
             SDL_AtomicSet(&m_NeedsIdr, 1);
 
+            // Set HDR mode. We may miss the callback if we're in the middle
+            // of recreating our decoder at the time the HDR transition happens.
+            m_VideoDecoder->setHdrMode(LiGetCurrentHostDisplayHdrMode());
+
             SDL_AtomicUnlock(&m_DecoderLock);
             break;
 
diff --git a/app/streaming/session.h b/app/streaming/session.h
index 86a6fb61..71d89025 100644
--- a/app/streaming/session.h
+++ b/app/streaming/session.h
@@ -117,6 +117,9 @@ private:
     static
     void clConnectionStatusUpdate(int connectionStatus);
 
+    static
+    void clSetHdrMode(bool enabled);
+
     static
     int arInit(int audioConfiguration,
                const POPUS_MULTISTREAM_CONFIGURATION opusConfig,
diff --git a/app/streaming/video/decoder.h b/app/streaming/video/decoder.h
index 30b1c7e2..8cf3d022 100644
--- a/app/streaming/video/decoder.h
+++ b/app/streaming/video/decoder.h
@@ -28,6 +28,23 @@ typedef struct _VIDEO_STATS {
     uint32_t measurementStartTimestamp;
 } VIDEO_STATS, *PVIDEO_STATS;
 
+typedef struct _HDR_MASTERING_METADATA {
+    uint8_t eotf;
+    uint8_t staticMetadataDescriptorId;
+    struct {
+        uint16_t x;
+        uint16_t y;
+    } displayPrimaries[3];
+    struct {
+        uint16_t x;
+        uint16_t y;
+    } whitePoint;
+    uint16_t maxDisplayMasteringLuminance;
+    uint16_t minDisplayMasteringLuminance;
+    uint16_t maxContentLightLevel;
+    uint16_t maxFrameAverageLightLevel;
+} HDR_MASTERING_METADATA, *PHDR_MASTERING_METADATA;
+
 typedef struct _DECODER_PARAMETERS {
     SDL_Window* window;
     StreamingPreferences::VideoDecoderSelection vds;
@@ -38,6 +55,7 @@ typedef struct _DECODER_PARAMETERS {
     int frameRate;
     bool enableVsync;
     bool enableFramePacing;
+    HDR_MASTERING_METADATA hdrMetadata;
 } DECODER_PARAMETERS, *PDECODER_PARAMETERS;
 
 class IVideoDecoder {
@@ -51,4 +69,5 @@ public:
     virtual QSize getDecoderMaxResolution() = 0;
     virtual int submitDecodeUnit(PDECODE_UNIT du) = 0;
     virtual void renderFrameOnMainThread() = 0;
+    virtual void setHdrMode(bool enabled) = 0;
 };
diff --git a/app/streaming/video/ffmpeg-renderers/renderer.h b/app/streaming/video/ffmpeg-renderers/renderer.h
index 672f2eab..23f75c7b 100644
--- a/app/streaming/video/ffmpeg-renderers/renderer.h
+++ b/app/streaming/video/ffmpeg-renderers/renderer.h
@@ -150,6 +150,10 @@ public:
         return getPreferredPixelFormat(videoFormat) == pixelFormat;
     }
 
+    virtual void setHdrMode(bool) {
+        // Nothing
+    }
+
     // IOverlayRenderer
     virtual void notifyOverlayUpdated(Overlay::OverlayType) override {
         // Nothing
diff --git a/app/streaming/video/ffmpeg.cpp b/app/streaming/video/ffmpeg.cpp
index 27d8529b..43f319c5 100644
--- a/app/streaming/video/ffmpeg.cpp
+++ b/app/streaming/video/ffmpeg.cpp
@@ -57,6 +57,11 @@ bool FFmpegVideoDecoder::isAlwaysFullScreen()
     return m_FrontendRenderer->getRendererAttributes() & RENDERER_ATTRIBUTE_FULLSCREEN_ONLY;
 }
 
+void FFmpegVideoDecoder::setHdrMode(bool enabled)
+{
+    m_FrontendRenderer->setHdrMode(enabled);
+}
+
 int FFmpegVideoDecoder::getDecoderCapabilities()
 {
     int capabilities = m_BackendRenderer->getDecoderCapabilities();
diff --git a/app/streaming/video/ffmpeg.h b/app/streaming/video/ffmpeg.h
index 89f19d4d..06c66a02 100644
--- a/app/streaming/video/ffmpeg.h
+++ b/app/streaming/video/ffmpeg.h
@@ -23,6 +23,7 @@ public:
     virtual QSize getDecoderMaxResolution() override;
     virtual int submitDecodeUnit(PDECODE_UNIT du) override;
     virtual void renderFrameOnMainThread() override;
+    virtual void setHdrMode(bool enabled) override;
 
     virtual IFFmpegRenderer* getBackendRenderer();
 
diff --git a/app/streaming/video/slvid.h b/app/streaming/video/slvid.h
index 145b985f..b8a420c3 100644
--- a/app/streaming/video/slvid.h
+++ b/app/streaming/video/slvid.h
@@ -20,6 +20,9 @@ public:
     // Unused since rendering is done directly from the decode thread
     virtual void renderFrameOnMainThread() {}
 
+    // HDR is not supported by SLVideo
+    virtual void setHdrMode(bool) {}
+
 private:
     static void slLogCallback(void* context, ESLVideoLog logLevel, const char* message);
 
diff --git a/moonlight-common-c/moonlight-common-c b/moonlight-common-c/moonlight-common-c
index cfe75eb5..abc7acb5 160000
--- a/moonlight-common-c/moonlight-common-c
+++ b/moonlight-common-c/moonlight-common-c
@@ -1 +1 @@
-Subproject commit cfe75eb56952718cdf0855a813b3b7d46d920ae5
+Subproject commit abc7acb5e4c219ebcb51031517b01bd266005e3a