diff --git a/CHANGELOG.md b/CHANGELOG.md
index a97a2f67..f182141c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,9 +2,11 @@
 
 ## Unreleased
 
+* Added `sourcemap.json` into the defualt `.gitignore` files ([#1145])
 * Fixed a bug where the last sync timestamp was not updating correctly in the plugin ([#1132])
 * Improved the reliability of sync replacements by adding better error handling and recovery ([#1135])
 
+[#1145]: https://github.com/rojo-rbx/rojo/pull/1145
 [#1132]: https://github.com/rojo-rbx/rojo/pull/1132
 [#1135]: https://github.com/rojo-rbx/rojo/pull/1135
 
diff --git a/assets/project-templates/model/gitignore.txt b/assets/project-templates/model/gitignore.txt
index 0dfcd838..885b2dc4 100644
--- a/assets/project-templates/model/gitignore.txt
+++ b/assets/project-templates/model/gitignore.txt
@@ -1,3 +1,5 @@
 # Roblox Studio lock files
 /*.rbxlx.lock
-/*.rbxl.lock
\ No newline at end of file
+/*.rbxl.lock
+
+sourcemap.json
diff --git a/assets/project-templates/place/gitignore.txt b/assets/project-templates/place/gitignore.txt
index 41d6a8ab..8a0a285b 100644
--- a/assets/project-templates/place/gitignore.txt
+++ b/assets/project-templates/place/gitignore.txt
@@ -3,4 +3,6 @@
 
 # Roblox Studio lock files
 /*.rbxlx.lock
-/*.rbxl.lock
\ No newline at end of file
+/*.rbxl.lock
+
+sourcemap.json
diff --git a/assets/project-templates/plugin/gitignore.txt b/assets/project-templates/plugin/gitignore.txt
index 608ce35a..2841e8e4 100644
--- a/assets/project-templates/plugin/gitignore.txt
+++ b/assets/project-templates/plugin/gitignore.txt
@@ -1,3 +1,5 @@
 # Plugin model files
 /{project_name}.rbxmx
 /{project_name}.rbxm
+
+sourcemap.json