diff --git a/Cargo.lock b/Cargo.lock
index b6c5186..dd00545 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -693,7 +693,7 @@ dependencies = [
 
 [[package]]
 name = "mdbook-toc"
-version = "0.5.0"
+version = "0.5.1-alpha.0"
 dependencies = [
  "clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 3c08056..2924d03 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mdbook-toc"
-version = "0.5.0"
+version = "0.5.1-alpha.0"
 authors = ["Jan-Erik Rediger <janerik@fnordig.de>"]
 description = "mdbook preprocessor to add Table of Contents"
 license = "MPL-2.0"