diff --git a/.gitmodules b/.gitmodules
index 1f6da08484..30adb590d3 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -60,7 +60,7 @@ fxDONOTUSEurl = https://github.com/ESCOMP/MOSART
 [submodule "mizuRoute"]
 path = components/mizuRoute
 url = https://github.com/ESCOMP/mizuRoute
-fxtag = cesm-coupling.n02_v2.1.2
+fxtag = cesm-coupling.n02_v2.1.3
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESCOMP/mizuRoute
@@ -68,7 +68,7 @@ fxDONOTUSEurl = https://github.com/ESCOMP/mizuRoute
 [submodule "ccs_config"]
 path = ccs_config
 url = https://github.com/ESMCI/ccs_config_cesm.git
-fxtag = ccs_config_cesm1.0.0
+fxtag = ccs_config_cesm1.0.8
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESMCI/ccs_config_cesm.git
@@ -76,7 +76,7 @@ fxDONOTUSEurl = https://github.com/ESMCI/ccs_config_cesm.git
 [submodule "cime"]
 path = cime
 url = https://github.com/ESMCI/cime
-fxtag = cime6.0.246
+fxtag = cime6.1.37
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESMCI/cime
@@ -84,7 +84,7 @@ fxDONOTUSEurl = https://github.com/ESMCI/cime
 [submodule "cmeps"]
 path = components/cmeps
 url = https://github.com/ESCOMP/CMEPS.git
-fxtag = cmeps0.14.77
+fxtag = cmeps1.0.16
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESCOMP/CMEPS.git
@@ -92,7 +92,7 @@ fxDONOTUSEurl = https://github.com/ESCOMP/CMEPS.git
 [submodule "cdeps"]
 path = components/cdeps
 url = https://github.com/ESCOMP/CDEPS.git
-fxtag = cdeps1.0.48
+fxtag = cdeps1.0.53
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESCOMP/CDEPS.git
@@ -100,7 +100,7 @@ fxDONOTUSEurl = https://github.com/ESCOMP/CDEPS.git
 [submodule "share"]
 path = share
 url = https://github.com/ESCOMP/CESM_share
-fxtag = share1.0.19
+fxtag = share1.0.20
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/ESCOMP/CESM_share
@@ -116,11 +116,19 @@ fxDONOTUSEurl = https://github.com/MCSclimate/MCT
 [submodule "parallelio"]
 path = libraries/parallelio
 url = https://github.com/NCAR/ParallelIO
-fxtag = pio2_6_2
+fxtag = pio2_6_3
 fxrequired = ToplevelRequired
 # Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
 fxDONOTUSEurl = https://github.com/NCAR/ParallelIO
 
+[submodule "mpi-serial"]
+path = libraries/mpi-serial
+url = https://github.com/ESMCI/mpi-serial
+fxtag = MPIserial_2.5.0
+fxrequired = ToplevelRequired
+# Standard Fork to compare to with "git fleximod test" to ensure personal forks aren't committed
+fxDONOTUSEurl = https://github.com/ESMCI/mpi-serial
+
 [submodule "doc-builder"]
 path = doc/doc-builder
 url = https://github.com/ESMCI/doc-builder
diff --git a/libraries/mpi-serial b/libraries/mpi-serial
new file mode 160000
index 0000000000..2c44fb3d32
--- /dev/null
+++ b/libraries/mpi-serial
@@ -0,0 +1 @@
+Subproject commit 2c44fb3d327be7c6429894bc5d4de769f3486848