diff --git a/MuonSpectrometer/MuonPhaseII/ActsMuonDetector/src/MuonDetectorBuilderTool.cxx b/MuonSpectrometer/MuonPhaseII/ActsMuonDetector/src/MuonDetectorBuilderTool.cxx
index 6e82f748a924d2df7287eb4095df626b388115de..0f654ae9bb27286bb8d3a4b9408f54d8f181ee14 100644
--- a/MuonSpectrometer/MuonPhaseII/ActsMuonDetector/src/MuonDetectorBuilderTool.cxx
+++ b/MuonSpectrometer/MuonPhaseII/ActsMuonDetector/src/MuonDetectorBuilderTool.cxx
@@ -13,7 +13,7 @@
 #include "Acts/Detector/DetectorVolume.hpp"
 #include "Acts/Detector/PortalGenerators.hpp"
 #include "Acts/Navigation/DetectorVolumeFinders.hpp"
-#include "Acts/Navigation/SurfaceCandidatesUpdators.hpp"
+#include "Acts/Navigation/SurfaceCandidatesUpdaters.hpp"
 #include "Acts/Navigation/NavigationDelegates.hpp"
 #include "Acts/Navigation/NavigationState.hpp"
 #include "Acts/Visualization/ObjVisualization3D.hpp"
diff --git a/Projects/Athena/build_externals.sh b/Projects/Athena/build_externals.sh
index d5d3bb75ea0019c8f01012ec5f7fc29c392123f4..138a8dc61b6066c605d6cd2c9c17de677a18a59f 100755
--- a/Projects/Athena/build_externals.sh
+++ b/Projects/Athena/build_externals.sh
@@ -12,7 +12,7 @@ ATLAS_BUILDTYPE="RelWithDebInfo"
 ATLAS_EXTRA_CMAKE_ARGS=(-DLCG_VERSION_NUMBER=104
                         -DLCG_VERSION_POSTFIX="c_ATLAS_3"
                         -DATLAS_GAUDI_SOURCE="URL;https://gitlab.cern.ch/atlas/Gaudi/-/archive/v37r2.000/Gaudi-v37r2.000.tar.gz;URL_MD5;dfeef8eb0b338bff8948b025c4b450cf"
-                        -DATLAS_ACTS_SOURCE="URL;https://github.com/acts-project/acts/archive/refs/tags/v31.0.0.tar.gz;URL_MD5;3eb0599d987bdb60e9614768b88b3b83")
+                        -DATLAS_ACTS_SOURCE="URL;https://github.com/acts-project/acts/archive/refs/tags/v31.2.0.tar.gz;URL_MD5;40cd1dbbecf1fdcb38c302466700c596")
 ATLAS_EXTRA_MAKE_ARGS=()
 
 # Let "the common script" do all the heavy lifting.
diff --git a/Tracking/Acts/ActsGeometry/src/SimpleCylinderDetBuilderTool.cxx b/Tracking/Acts/ActsGeometry/src/SimpleCylinderDetBuilderTool.cxx
index 6f4f10ad91adc8c002066dda7c89aa1cba5f7991..be7c9929349d6884ba41b82d4e4d4bd7a7d97bdf 100644
--- a/Tracking/Acts/ActsGeometry/src/SimpleCylinderDetBuilderTool.cxx
+++ b/Tracking/Acts/ActsGeometry/src/SimpleCylinderDetBuilderTool.cxx
@@ -9,7 +9,7 @@
 #include "Acts/Detector/DetectorVolume.hpp"
 #include "Acts/Detector/PortalGenerators.hpp"
 #include "Acts/Navigation/DetectorVolumeFinders.hpp"
-#include "Acts/Navigation/SurfaceCandidatesUpdators.hpp"
+#include "Acts/Navigation/SurfaceCandidatesUpdaters.hpp"
 #include "Acts/Navigation/NavigationDelegates.hpp"
 #include "Acts/Navigation/NavigationState.hpp"
 #include "Acts/Visualization/ObjVisualization3D.hpp"