diff --git a/SuperBuild/cmake/External-OpenSfM.cmake b/SuperBuild/cmake/External-OpenSfM.cmake
index 7215cf9f..6b1a0067 100644
--- a/SuperBuild/cmake/External-OpenSfM.cmake
+++ b/SuperBuild/cmake/External-OpenSfM.cmake
@@ -30,7 +30,7 @@ ExternalProject_Add(${_proj_name}
   #--Download step--------------
   DOWNLOAD_DIR      ${SB_DOWNLOAD_DIR}
   GIT_REPOSITORY    https://github.com/WebODM/OpenSfM/
-  GIT_TAG           bf7f84a9109098971f7a15ed9b0348b98e093ed7
+  GIT_TAG           fac86a643ff542b9a7718ece838549e67bd136d8
   #--Update/Patch step----------
   UPDATE_COMMAND    git submodule update --init --recursive
   #--Configure step-------------
diff --git a/VERSION b/VERSION
index 19811903..f2807196 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.8.0
+3.8.1
diff --git a/opendm/photo.py b/opendm/photo.py
index 3ce827b3..36463185 100644
--- a/opendm/photo.py
+++ b/opendm/photo.py
@@ -113,6 +113,7 @@ def __init__(self, path_file):
         self.latitude = None
         self.longitude = None
         self.altitude = None
+        self.relative_altitude = None
 
         # Multi-band fields
         self.band_name = 'RGB'
@@ -390,6 +391,9 @@ def parse_exif_values(self, _path_file):
                     self.set_attr_from_xmp_tag('altitude', xtags, [
                         '@drone-dji:AbsoluteAltitude'
                     ], float)
+                    self.set_attr_from_xmp_tag('relative_altitude', xtags, [
+                        '@drone-dji:RelativeAltitude'
+                    ], float)
 
                     # Phantom 4 RTK
                     if '@drone-dji:RtkStdLon' in xtags:
@@ -867,6 +871,9 @@ def to_opensfm_exif(self, rolling_shutter = False, rolling_shutter_readout = 0,
                 'kappa': self.kappa
             }
         
+        if self.relative_altitude is not None:
+            d['relative_altitude'] = self.relative_altitude
+        
         # Speed is not useful without GPS
         if self.has_speed() and has_gps:
             d['speed'] = [self.speed_y, self.speed_x, self.speed_z]