diff --git a/actor_controller/pyproject.toml b/actor_controller/pyproject.toml
index 6a28c6232..58a38c3a4 100644
--- a/actor_controller/pyproject.toml
+++ b/actor_controller/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-actor-controller"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 actor controller interface and implementations."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/ci_group/pyproject.toml b/ci_group/pyproject.toml
index d84698889..693492150 100644
--- a/ci_group/pyproject.toml
+++ b/ci_group/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-ci-group"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 Computational Intelligence Group experimentation tools and standards."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/experimentation/pyproject.toml b/experimentation/pyproject.toml
index 2bec80761..d3dbdba66 100644
--- a/experimentation/pyproject.toml
+++ b/experimentation/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-experimentation"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 experimentation tools."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/modular_robot/pyproject.toml b/modular_robot/pyproject.toml
index 303403b56..e1d726019 100644
--- a/modular_robot/pyproject.toml
+++ b/modular_robot/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-modular-robot"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 modular robot tools."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/rpi_controller/pyproject.toml b/rpi_controller/pyproject.toml
index 64ad5575d..22a4b5579 100644
--- a/rpi_controller/pyproject.toml
+++ b/rpi_controller/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-rpi-controller"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Raspberry Pi controller for revolve2."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/rpi_controller_remote/pyproject.toml b/rpi_controller_remote/pyproject.toml
index 3ab9cabfe..b7c06c9f7 100644
--- a/rpi_controller_remote/pyproject.toml
+++ b/rpi_controller_remote/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-rpi-controller-remote"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 remote controller for the raspberry pi controller."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/serialization/pyproject.toml b/serialization/pyproject.toml
index b22c6c6c1..deaf923a3 100644
--- a/serialization/pyproject.toml
+++ b/serialization/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-serialization"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Serialization classes and helper functions for revolve2. Deprecated and soon to be removed."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/simulation/pyproject.toml b/simulation/pyproject.toml
index a4050593c..43f8d2952 100644
--- a/simulation/pyproject.toml
+++ b/simulation/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-simulation"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 simulator abstraction layer."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"
diff --git a/simulators/mujoco/pyproject.toml b/simulators/mujoco/pyproject.toml
index f7ee5f7e6..0a4f31c96 100644
--- a/simulators/mujoco/pyproject.toml
+++ b/simulators/mujoco/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "revolve2-simulators-mujoco"
-version = "0.3.9b1"
+version = "0.4.0b2"
 description = "Revolve2 mujoco simulator."
 authors = ["Aart Stuurman <aartstuurman@hotmail.com>"]
 repository = "https://github.com/ci-group/revolve2"