diff --git a/Cargo.toml b/Cargo.toml
index 537573dd..5a0ea0d7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ members = ["tket2", "tket2-py", "compile-rewriter", "badger-optimiser"]
 default-members = ["tket2"]
 
 [workspace.package]
-version = "0.1.0"
+version = "0.0.0-alpha.1"
 rust-version = "1.70"
 edition = "2021"
 homepage = "https://github.com/CQCL/tket2"
diff --git a/pyproject.toml b/pyproject.toml
index 09ae849c..2f4bf5c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tket2-py"
-version = "0.1.0"
+version = "0.0.0-alpha.1"
 description = "pytket extension for the tket 2 compiler"
 classifiers = []                                         # TODO
 authors = []                                             # TODO
@@ -27,7 +27,7 @@ build-backend = "maturin"
 
 [project]
 name = "tket2"
-version = "0.1.0"
+version = "0.0.0-alpha.1"
 description = "pytket extension for the tket 2 compiler"
 authors = []                                             # TODO
 classifiers = []                                         # TODO