diff --git a/cime_config/testdefs/testlist_rtm.xml b/cime_config/testdefs/testlist_rtm.xml
index 410406a..ecba216 100644
--- a/cime_config/testdefs/testlist_rtm.xml
+++ b/cime_config/testdefs/testlist_rtm.xml
@@ -1,26 +1,16 @@
 <?xml version="1.0"?>
 <testlist version="2.0">
 
-  <test name="ERS_D_Ld5" grid="f10_f10_mg37" compset="I2000Clm45Sp" testmods="rtm/default">
+  <test name="ERS_D_Ld5" grid="f10_f10_mt201" compset="I2000Clm50SpRtmFl" testmods="rtm/default">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm"></machine>
-      <machine name="izumi" compiler="nag" category="rtm"></machine>
     </machines>
     <options>
       <option name="wallclock">00:20:00</option>
       <option name="comment"  >Restart test with DEBUG on</option>
     </options>
   </test>
-  <test name="ERS_D_Ld5" grid="f10_f10_mg37" compset="I2000Clm50SpRtmFl" testmods="rtm/default">
-    <machines>
-      <machine name="derecho" compiler="intel" category="rtm"></machine>
-    </machines>
-    <options>
-      <option name="wallclock">00:20:00</option>
-      <option name="comment"  >Restart test with DEBUG on</option>
-    </options>
-  </test>
-  <test name="ERS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/default">
+  <test name="ERS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/default">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm"></machine>
       <machine name="derecho" compiler="gnu" category="rtm"></machine>
@@ -30,7 +20,7 @@
       <option name="comment"  >Restart test without DEBUG on all machines/compilers (except nag because of a CTSM issue)</option>
     </options>
   </test>
-  <test name="SMS_D_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/default">
+  <test name="SMS_D_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/default">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm"></machine>
       <machine name="derecho" compiler="gnu" category="rtm"></machine>
@@ -40,7 +30,7 @@
       <option name="comment"  >Run with DEBUG compiler option all machine/compilers</option>
     </options>
   </test>
-  <test name="SMS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmColdStart">
+  <test name="SMS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmColdStart">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm"></machine>
       <machine name="derecho" compiler="gnu" category="rtm"></machine>
@@ -50,7 +40,7 @@
       <option name="comment"  >Run a Cold-Start with main machine all compilers</option>
     </options>
   </test>
-  <test name="ERS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmOnIceOff">
+  <test name="ERS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmOnIceOff">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm">
          <options>
@@ -63,7 +53,7 @@
       <option name="comment"  >Run with ice off</option>
     </options>
   </test>
-  <test name="ERS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmOnFloodOnEffvelOn">
+  <test name="ERS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmOnFloodOnEffvelOn">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm">
         <options>
@@ -76,7 +66,7 @@
       <option name="comment"  >Run with flooding on and effective velocity on</option>
     </options>
   </test>
-  <test name="ERS_D_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmOnFloodOnEffvelOn">
+  <test name="ERS_D_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmOnFloodOnEffvelOn">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm">
         <options>
@@ -89,7 +79,7 @@
       <option name="comment"  >Run with flooding on and effective velocity on, DEBUG on, all machines/compilers</option>
     </options>
   </test>
-  <test name="ERS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmOnFloodOnEffvelOff">
+  <test name="ERS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmOnFloodOnEffvelOff">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm">
         <options>
@@ -102,7 +92,7 @@
       <option name="comment"  >Run with flooding on and effective velocity off</option>
     </options>
   </test>
-  <test name="ERS_Ld5" grid="f09_f09_mg17" compset="I1850Clm60SpNoAnthro" testmods="rtm/rtmOff">
+  <test name="ERS_Ld5" grid="f09_f09_mt233" compset="I1850Clm60SpNoAnthroRtm" testmods="rtm/rtmOff">
     <machines>
       <machine name="derecho" compiler="intel" category="rtm">
         <options>
diff --git a/docs/ChangeLog.md b/docs/ChangeLog.md
index b54bf3a..1987b36 100644
--- a/docs/ChangeLog.md
+++ b/docs/ChangeLog.md
@@ -1,5 +1,18 @@
 <hr>
 
+# Tag name:  rtm1_0_90
+### Originator(s): slevis
+### Date: Oct 09, 2026
+### One-line Summary: Move g17/g37 grids to t233/t201
+
+Resolves ESCOMP/RTM#68 Remove CLM45 compset from testing as CTSM is deprecating and removing it from compsets
+
+PR ESCOMP/RTM#69
+Corresponds to ESCOMP/MOSART#131
+Relates to ESCOMP/CTSM#4234
+
+<hr>
+
 # Tag name:  rtm1_0_89
 ### Originator(s): slevis
 ### Date: Jul 31, 2025