diff --git a/changelog.md b/changelog.md
index 0322b99..9f2a9ee 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,14 @@
 
 ---
 
+## [4.0.1] 2024-02-02
+
+### Fixed
+
+- Fixed issue where treeshaking runs against Lambdas with explicit dependency manifests in cases where those Lambdas were themselves plugins installed as dependencies
+
+---
+
 ## [4.0.0] 2024-01-09
 
 ### Added
diff --git a/src/hydrate.js b/src/hydrate.js
index b707fdd..fcf4f14 100644
--- a/src/hydrate.js
+++ b/src/hydrate.js
@@ -62,6 +62,12 @@ function hydrator (inventory, installing, params, callback) {
 
   // Does this project have any Lambdae?
   let hasLambdae = inv.lambdaSrcDirs?.length
+  let manifestFiles = [ 'package.json', 'requirements.txt', 'Gemfile' ]
+  let possibleLambdaManifests = []
+  if (hasLambdae) possibleLambdaManifests = inv.lambdaSrcDirs.reduce((acc, dir) => {
+    acc.push(...manifestFiles.map(manifest => join(dir, manifest)))
+    return acc
+  }, [])
 
   // From here on out normalize all file comparisons to Unix paths
   let sharedDir = inv.shared && inv.shared.src && stripCwd(inv.shared.src, cwd)
@@ -71,10 +77,11 @@ function hydrator (inventory, installing, params, callback) {
    * Find our dependency manifests
    */
   // eslint-disable-next-line
-  let pattern = p => pathToUnix(`${p}/**/@(package.json|requirements.txt|Gemfile)`)
+  let pattern = p => pathToUnix(`${p}/**/@(${manifestFiles.join('|')})`)
   let dir = basepath || '.'
   // Get everything except shared
   let manifests = globSync(pattern(dir), { dot: true }).filter(file => {
+    if (possibleLambdaManifests.includes(file)) return true
     if (isDep(file)) return false
     if (sharedDir && file.includes(sharedDir)) return false
     if (viewsDir && file.includes(viewsDir)) return false