diff --git a/Cargo.toml b/Cargo.toml
index 24c217a..184bd6f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "splines"
-version = "4.3.1"
+version = "4.3.1-dev"
 license = "BSD-3-Clause"
 authors = ["Dimitri Sabadie <dimitri.sabadie@gmail.com>"]
 description = "Spline interpolation made easy"