diff --git a/cmake/Modules/Packages/ML-PACE.cmake b/cmake/Modules/Packages/ML-PACE.cmake
index 263df9f24d..0086475354 100644
--- a/cmake/Modules/Packages/ML-PACE.cmake
+++ b/cmake/Modules/Packages/ML-PACE.cmake
@@ -1,5 +1,6 @@
-set(PACELIB_URL "https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2021.10.25.yaml_pace.tar.gz" CACHE STRING "URL for PACE evaluator library sources")
-set(PACELIB_MD5 "4c84c1cb1e2d8c690e3f797433ed2886" CACHE STRING "MD5 checksum of PACE evaluator library tarball")
+set(PACELIB_URL "https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2021.10.25.yaml_pace.upd2.tar.gz" CACHE STRING "URL for PACE evaluator library sources")
+
+set(PACELIB_MD5 "6ba037a6149bd5c9472ead6356288a6a" CACHE STRING "MD5 checksum of PACE evaluator library tarball")
 mark_as_advanced(PACELIB_URL)
 mark_as_advanced(PACELIB_MD5)
 
diff --git a/lib/pace/Install.py b/lib/pace/Install.py
index 1c243c0446..7c2c798146 100644
--- a/lib/pace/Install.py
+++ b/lib/pace/Install.py
@@ -15,7 +15,7 @@ from install_helpers import fullpath, geturl, checkmd5sum
 # settings
 
 thisdir = fullpath('.')
-version = 'v.2021.10.25.yaml_pace'
+version = 'v.2021.10.25.yaml_pace.upd2'
 
 # known checksums for different PACE versions. used to validate the download.
 checksums = { \
@@ -23,6 +23,7 @@ checksums = { \
         'v.2021.4.9'      : '4db54962fbd6adcf8c18d46e1798ceb5',
         'v.2021.9.28'     : 'f98363bb98adc7295ea63974738c2a1b',
         'v.2021.10.25.yaml_pace' : '4c84c1cb1e2d8c690e3f797433ed2886'
+        'v.2021.10.25.yaml_pace.upd2': '6ba037a6149bd5c9472ead6356288a6a'
         }