diff --git a/lib/pace/Install.py b/lib/pace/Install.py
index e7bcacefb7..7e0f14d47c 100644
--- a/lib/pace/Install.py
+++ b/lib/pace/Install.py
@@ -22,11 +22,6 @@ version ='v.2022.06.27'
 
 # 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': 'a2ac3315c41a1a4a5c912bcb1bc9c5cc',
-    'v.2021.10.25.fix': 'e0572de57039d4afedefb25707b6ceae',
     'v.2021.10.25.fix2': '32394d799bc282bb57696c78c456e64f',
     'v.2022.06.27': '400f0a4b44c1ce64ae47796e6de4bba8'
 }
diff --git a/lib/pace/Makefile.lammps b/lib/pace/Makefile.lammps
index cda4e81662..e925f86089 100644
--- a/lib/pace/Makefile.lammps
+++ b/lib/pace/Makefile.lammps
@@ -1,3 +1,3 @@
 pace_SYSINC =-I../../lib/pace/src/ML-PACE/ace -I../../lib/pace/src/ML-PACE/ace-evaluator -I../../lib/pace/src/yaml-cpp/include -I../../lib/pace/src/wigner-cpp/include/wigner -DEXTRA_C_PROJECTIONS
 pace_SYSLIB = -L../../lib/pace/ -lpace -L../../lib/pace/src/yaml-cpp/ -lyaml-cpp
-pace_SYSPATH =
\ No newline at end of file
+pace_SYSPATH =