diff --git a/lakefile.lean b/lakefile.lean
index cc7c73c..e4e9edf 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -14,16 +14,16 @@ def srcNames := #[
 def wrapperName := "wrapper"
 def buildDir := defaultBuildDir
 
-def cmarkOTarget (pkg : Package) (srcName : String) : FetchM (BuildJob FilePath) := do
+def cmarkOTarget (pkg : Package) (srcName : String) : FetchM (Job FilePath) := do
   let oFile := pkg.dir / buildDir / cmarkDir / ⟨ srcName ++ ".o" ⟩
-  let srcTarget ← inputFile <| pkg.dir / cmarkDir / ⟨ srcName ++ ".c" ⟩
+  let srcTarget ← inputFile (pkg.dir / cmarkDir / ⟨ srcName ++ ".c" ⟩) true
   buildFileAfterDep oFile srcTarget λ srcFile => do
     let flags := #["-I", (pkg.dir / cmarkDir).toString, "-fPIC"]
     compileO oFile srcFile flags
 
-def wrapperOTarget (pkg : Package) : FetchM (BuildJob FilePath) := do
+def wrapperOTarget (pkg : Package) : FetchM (Job FilePath) := do
   let oFile := pkg.dir / buildDir / wrapperDir / ⟨ wrapperName ++ ".o" ⟩
-  let srcTarget ← inputFile <| pkg.dir / wrapperDir / ⟨ wrapperName ++ ".c" ⟩
+  let srcTarget ← inputFile (pkg.dir / wrapperDir / ⟨ wrapperName ++ ".c" ⟩) true
   buildFileAfterDep oFile srcTarget λ srcFile => do
     let flags := #["-I", (← getLeanIncludeDir).toString, "-I", (pkg.dir / cmarkDir).toString, "-fPIC"]
     compileO oFile srcFile flags
diff --git a/lean-toolchain b/lean-toolchain
index d8a6d7e..62ccd71 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.8.0-rc1
+leanprover/lean4:v4.16.0-rc1