diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3ce2cd1e..00a824c4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
   # This workflow contains a single job called "build"
   build:
     # The type of runner that the job will run on
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python_version: ['3.11']
diff --git a/pyproject.toml b/pyproject.toml
index 6bc6a694..f54e5b8b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tibanna"
-version = "4.0.0.1b3"  # TODO: To become 5.0.0
+version = "4.0.0.1b4"  # TODO: To become 5.0.0
 description = "Tibanna runs portable pipelines (in CWL/WDL) on the AWS Cloud."
 authors = ["4DN-DCIC Team <support@4dnucleome.org>"]
 license = "MIT"