diff --git a/README.md b/README.md
index bd228e62..1e306dde 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Workflow management tools for AutoRA. 
 
+This package is deprecated and has been merged into AutoRA Core ([GitHub](https://github.com/AutoResearch/autora-core) | [PyPI](https://pypi.org/project/autora-core/)).
+
 ## User Guide
 
 You will need:
diff --git a/pyproject.toml b/pyproject.toml
index 13ca10cb..e6ca2663 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,24 +10,24 @@ readme = "docs/index.md"
 license = {file = "LICENSE"}
 
 dependencies = [
-    "autora-core>=4.0.0",
+    "autora-core>=4.0.0,<4.1.0",
     "typer[all]",
 ]
 
 [project.optional-dependencies]
 dev = [
-    "autora-core[dev]>=4.0.0",
+    "autora-core[dev]>=4.0.0,<4.1.0",
     "autora-workflow[docs]",
     "autora-workflow[test]",
 ]
 docs = [
-    "autora-core[docs]>=4.0.0",
+    "autora-core[docs]>=4.0.0,<4.1.0",
     "scikit-learn",
     "matplotlib",
     "pandas",
 ]
 test = [
-    "autora-core[test]>=4.0.0",
+    "autora-core[test]>=4.0.0,<4.1.0",
     "autora-workflow[serializers]",
     "hypothesis",
     "scikit-learn",