diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index 341023282..f095690f0 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
index 19269bbc6..9eb0f64c8 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorServer_defs.h
@@ -35,8 +35,8 @@
 /* Firmware Definitions */
 #define IP_HEADER_SIZE              (20)
 #define FIXED_PLL_FREQUENCY			(020000000) // 20MHz
-#define READOUT_PLL_VCO_FREQ_HZ     (750000000) // 750MHz 
-#define SYSTEM_PLL_VCO_FREQ_HZ      (750000000) // 750MHz
+#define READOUT_PLL_VCO_FREQ_HZ     (1250000000) // 1.25GHz 
+#define SYSTEM_PLL_VCO_FREQ_HZ      (1250000000) // 1.25GHz
 #define MAX_PATTERN_LENGTH  		(0x2000) // maximum number of words (64bit)
 #define WAIT_TIME_US_STP_ACQ        (100)
 
diff --git a/slsSupportLib/include/versionAPI.h b/slsSupportLib/include/versionAPI.h
index 669855886..a582e14ad 100644
--- a/slsSupportLib/include/versionAPI.h
+++ b/slsSupportLib/include/versionAPI.h
@@ -9,4 +9,4 @@
 #define APIJUNGFRAU 0x191111
 #define APIEIGER 0x191111
 #define APIGOTTHARD2 0x191119
-#define APIMYTHEN3 0x191120
+#define APIMYTHEN3 0x191121