diff --git a/.github/workflows/antsibull-docs.yml b/.github/workflows/antsibull-docs.yml
index a839671c..d9ea8be3 100644
--- a/.github/workflows/antsibull-docs.yml
+++ b/.github/workflows/antsibull-docs.yml
@@ -33,6 +33,7 @@ jobs:
           - '3.11'
         antsibull_core_ref:
           - main
+          - "stable-2"
         antsibull_docs_parser_ref:
           - main
         include:
diff --git a/pyproject.toml b/pyproject.toml
index a619aceb..4708d255 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
 requires-python = ">=3.9"
 dependencies = [
     "ansible-pygments",
-    "antsibull-core >= 2.1.0, < 3.0.0",
+    "antsibull-core >= 2.1.0, <= 3.0.0.dev0",
     "antsibull-docs-parser >= 1.0.0, < 2.0.0",
     "asyncio-pool",
     "docutils",