diff --git a/.github/scripts/check-commit.sh b/.github/scripts/check-commit.sh
index fad8806a..27abacd4 100755
--- a/.github/scripts/check-commit.sh
+++ b/.github/scripts/check-commit.sh
@@ -91,7 +91,7 @@ search
 
 submodules=("firesim")
 dir="sims"
-branches=("master" "main" "dev")
+branches=("master" "main" "dev" "1.13.x")
 search
 
 submodules=("hammer")
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 260aece3..4b4edd9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,15 @@
 
 This changelog follows the format defined here: https://keepachangelog.com/en/1.0.0/
 
+## [1.6.3] - 2022-04-06
+
+FireSim bump for various fixes. Revert shallow cloning. Various CI fixes.
+
+### Fixed
+* Bump to FireSim 1.13.4 (changelog: https://github.com/firesim/firesim/blob/1.13.4/CHANGELOG.md#1134---2022-04-06)
+* Revert shallow cloning.
+* Various CI fixes.
+
 ## [1.6.2] - 2022-03-01
 
 Minor fixes to FireSim.
@@ -9,7 +18,6 @@ Minor fixes to FireSim.
 ### Fixed
 * Bump to FireSim 1.13.3 (#1134)
 
-
 ## [1.6.1] - 2022-03-01
 
 Minor fixes to FireSim.
diff --git a/sims/firesim b/sims/firesim
index a0f78b1c..27bfce91 160000
--- a/sims/firesim
+++ b/sims/firesim
@@ -1 +1 @@
-Subproject commit a0f78b1cd081b1199acbfaa588a13b1f41ea26fa
+Subproject commit 27bfce9151a20520f5f45907e4a43c0c29a2f3dc