diff --git a/Cargo.lock b/Cargo.lock
index 7056511..63f49c3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -285,7 +285,7 @@ dependencies = [
 
 [[package]]
 name = "hpke_spec"
-version = "0.1.1"
+version = "0.1.2-dev0"
 dependencies = [
  "hacspec-lib",
  "hpke",
diff --git a/Cargo.toml b/Cargo.toml
index 9a850a1..0b89250 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hpke_spec"
-version = "0.1.1"
+version = "0.1.2-dev0"
 edition = "2021"
 publish = false
 
diff --git a/pyproject.toml b/pyproject.toml
index 0cbf658..594c14a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "maturin"
 [project]
 name = "hpke_spec"
 description = "The Hybrid Public Key Encryption (HPKE) standard in Python"
-version = "0.1.1"  # NOTE: auto-updated during release
+version = "0.1.2-dev0"  # NOTE: auto-updated during release
 requires-python = ">=3.8"
 readme = "README.md"
 license = { file = "LICENSE" }