diff --git a/docs/Project.toml b/docs/Project.toml
index 14d8127..284f447 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -14,3 +14,4 @@ Sparspak = "e56a9233-b9d6-4f03-8d0f-1825330902ac"
 
 [compat]
 IterativeSolvers = "0.9"
+Documenter = "1.0"
diff --git a/docs/make.jl b/docs/make.jl
index 0bd9b36..25c77cb 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -5,6 +5,7 @@ function mkdocs()
     makedocs(; sitename = "ExtendableSparse.jl",
              modules = [ExtendableSparse],
              doctest = true,
+             warnonly = true, 
              clean = false,
              authors = "J. Fuhrmann",
              repo = "https://github.com/j-fu/ExtendableSparse.jl",