diff --git a/bld/namelist_files/namelist_defaults_ctsm.xml b/bld/namelist_files/namelist_defaults_ctsm.xml
index e065807741..d3b3cc9715 100644
--- a/bld/namelist_files/namelist_defaults_ctsm.xml
+++ b/bld/namelist_files/namelist_defaults_ctsm.xml
@@ -484,9 +484,9 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
-lnd/clm2/paramdata/ctsm51_params.c240207.nc
-lnd/clm2/paramdata/clm50_params.c240207.nc
-lnd/clm2/paramdata/clm45_params.c240207.nc
+lnd/clm2/paramdata/ctsm51_params.c240207b.nc
+lnd/clm2/paramdata/clm50_params.c240207b.nc
+lnd/clm2/paramdata/clm45_params.c240207b.nc
diff --git a/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm b/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
index 8135bddf3b..c235d72df1 100644
--- a/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
+++ b/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
@@ -1,2 +1,2 @@
-paramfile = '$DIN_LOC_ROOT/lnd/clm2/paramdata/ctsm51_ciso_cwd_hr_params.c240207.nc'
+paramfile = '$DIN_LOC_ROOT/lnd/clm2/paramdata/ctsm51_ciso_cwd_hr_params.c240207b.nc'
hist_fincl1 = 'CWDC_HR','C13_CWDC_HR','C14_CWDC_HR','CWD_HR_L2','CWD_HR_L2_vr','CWD_HR_L3','CWD_HR_L3_vr'
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 84787d3087..084516e23e 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,13 +1,13 @@
===============================================================
Tag name: ctsm5.1.dev167
Originator(s): samrabin (Sam Rabin, UCAR/TSS, samrabin@ucar.edu)
-Date: Thu Feb 8 11:24:15 MST 2024
+Date: Thu 08 Feb 2024 01:56:05 PM MST
One-line Summary: Delete _FillValue and history from parameter files
Purpose and description of changes
----------------------------------
-Updates parameter files to c240207. These are the same as c240105 except:
+Updates parameter files to c240207b. These are the same as c240105 except:
- Attribute _FillValue has been removed from all variables
- Global attributes history, history_of_appended_files, and latest_git_log have been removed