diff --git a/cmake/Modules/Packages/ML-PACE.cmake b/cmake/Modules/Packages/ML-PACE.cmake
index ec3fa23f4c..6b7c13eafe 100644
--- a/cmake/Modules/Packages/ML-PACE.cmake
+++ b/cmake/Modules/Packages/ML-PACE.cmake
@@ -1,6 +1,6 @@
-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_URL "https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2021.10.25.tar.gz" CACHE STRING "URL for PACE evaluator library sources")
 
-set(PACELIB_MD5 "6ba037a6149bd5c9472ead6356288a6a" CACHE STRING "MD5 checksum of PACE evaluator library tarball")
+set(PACELIB_MD5 "9cb2ad286abacdc86faf5a9e3a8abd71" 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 7c2c798146..7825207f6c 100644
--- a/lib/pace/Install.py
+++ b/lib/pace/Install.py
@@ -15,15 +15,14 @@ from install_helpers import fullpath, geturl, checkmd5sum
 # settings
 
 thisdir = fullpath('.')
-version = 'v.2021.10.25.yaml_pace.upd2'
+version = 'v.2021.10.25'
 
 # known checksums for different PACE versions. used to validate the download.
 checksums = { \
         'v.2021.2.3.upd2' : '8fd1162724d349b930e474927197f20d',
         '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'
+        'v.2021.10.25'    : '9cb2ad286abacdc86faf5a9e3a8abd71'
         }
 
 
diff --git a/tools/offline/scripts/init_http_cache.sh b/tools/offline/scripts/init_http_cache.sh
index ea234c8fbb..8633120d05 100755
--- a/tools/offline/scripts/init_http_cache.sh
+++ b/tools/offline/scripts/init_http_cache.sh
@@ -51,7 +51,7 @@ KOKKOS_URL="https://github.com/kokkos/kokkos/archive/3.4.01.tar.gz"
 KIM_URL="https://s3.openkim.org/kim-api/kim-api-2.2.1.txz"
 MSCG_URL="https://github.com/uchicago-voth/MSCG-release/archive/1.7.3.1.tar.gz"
 PLUMED_URL="https://github.com/plumed/plumed2/releases/download/v2.7.2/plumed-src-2.7.2.tgz"
-PACELIB_URL="https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2021.10.25.yaml_pace.upd2.tar.gz"
+PACELIB_URL="https://github.com/ICAMS/lammps-user-pace/archive/refs/tags/v.2021.10.25.tar.gz"
 LATTE_URL="https://github.com/lanl/LATTE/archive/v1.2.2.tar.gz"
 SCAFACOS_URL="https://github.com/scafacos/scafacos/releases/download/v1.0.1/scafacos-1.0.1.tar.gz"
 MDI_URL="https://github.com/MolSSI-MDI/MDI_Library/archive/v1.2.9.tar.gz"
@@ -62,7 +62,7 @@ CUB_FILENAME="cub-1.12.0.tar.gz"
 KOKKOS_FILENAME="kokkos-3.4.01.tar.gz"
 MSCG_FILENAME="mscg-1.7.3.1.tar.gz"
 LATTE_FILENAME="latte-1.2.2.tar.gz"
-PACELIB_FILENAME="v.2021.10.25.yaml_pace.upd2.tar.gz"
+PACELIB_FILENAME="v.2021.10.25.tar.gz"
 
 TARBALLS=(
     MPICH2_WIN64_DEVEL_URL