diff --git a/L/LightSumTypes/Compat.toml b/L/LightSumTypes/Compat.toml
index 831b6c182e0ab5e..169ce62125a997f 100644
--- a/L/LightSumTypes/Compat.toml
+++ b/L/LightSumTypes/Compat.toml
@@ -2,3 +2,6 @@
 ExprTools = "0.1"
 MacroTools = "0.5"
 julia = "1.2.0-1"
+
+["4.0.1-4"]
+PrecompileTools = "1"
diff --git a/L/LightSumTypes/Deps.toml b/L/LightSumTypes/Deps.toml
index 8ffadf49468b30e..98c8e0bc5797e14 100644
--- a/L/LightSumTypes/Deps.toml
+++ b/L/LightSumTypes/Deps.toml
@@ -1,3 +1,6 @@
 [4]
 ExprTools = "e2ba6199-217a-4e67-a87a-7c52f15ade04"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
+
+["4.0.1-4"]
+PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
diff --git a/L/LightSumTypes/Versions.toml b/L/LightSumTypes/Versions.toml
index a617d7cfa6a68d9..dd4bd7055088a4e 100644
--- a/L/LightSumTypes/Versions.toml
+++ b/L/LightSumTypes/Versions.toml
@@ -1,2 +1,5 @@
 ["4.0.0"]
 git-tree-sha1 = "c9f498f69f8d9c7b6c2ce74a78a5a868505cf1b0"
+
+["4.0.1"]
+git-tree-sha1 = "6b36caffb58cefb46028619b3c9c9da06cd31752"