diff --git a/Cargo.toml b/Cargo.toml
index 185fd93..e591a19 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ default-members = [".", "members/libpt-core"]
 
 [workspace.package]
 publish = true
-version = "0.3.12"
+version = "0.4.0-alpha.1"
 edition = "2021"
 authors = ["Christoph J. Scherr <software@cscherr.de>"]
 license = "MIT"
@@ -28,10 +28,10 @@ categories = [
 [workspace.dependencies]
 anyhow = "1.0.79"
 thiserror = "1.0.56"
-libpt-core = { version = "0.3.11", path = "members/libpt-core" }
-libpt-bintols = { version = "0.3.11", path = "members/libpt-bintols" }
-libpt-log = { version = "0.3.11", path = "members/libpt-log" }
-libpt-py = { version = "0.3.11", path = "members/libpt-py" }
+libpt-core = { version = "0.3.12", path = "members/libpt-core" }
+libpt-bintols = { version = "0.3.12", path = "members/libpt-bintols" }
+libpt-log = { version = "0.3.12", path = "members/libpt-log" }
+libpt-py = { version = "0.3.12", path = "members/libpt-py" }
 
 [package]
 name = "libpt"
diff --git a/members/libpt-core/Cargo.toml b/members/libpt-core/Cargo.toml
index cacd5b9..f9cf89b 100644
--- a/members/libpt-core/Cargo.toml
+++ b/members/libpt-core/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "libpt-core"
 publish.workspace = true
-version.workspace = true
+version = "0.3.12"
 edition.workspace = true
 authors.workspace = true
 license.workspace = true
diff --git a/members/libpt-log/Cargo.toml b/members/libpt-log/Cargo.toml
index a36149c..f71b73a 100644
--- a/members/libpt-log/Cargo.toml
+++ b/members/libpt-log/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "libpt-log"
 publish.workspace = true
-version.workspace = true
+version = "0.3.12"
 edition.workspace = true
 authors.workspace = true
 license.workspace = true
diff --git a/members/libpt-py/Cargo.toml b/members/libpt-py/Cargo.toml
index e2ae9b2..3398d38 100644
--- a/members/libpt-py/Cargo.toml
+++ b/members/libpt-py/Cargo.toml
@@ -11,7 +11,7 @@ name = "libpt"
 crate-type = ["cdylib", "rlib"]
 
 [dependencies]
-libpt = { version = "0.3.11", path = "../.." }
+libpt = { version = "0.4.0-alpha.1", path = "../.." }
 pyo3 = { version = "0.19.0", features = ["full"] }
 anyhow.workspace = true