diff --git a/.github/workflows/antsibull-build.yml b/.github/workflows/antsibull-build.yml
index d12df6c0..8e47aae5 100644
--- a/.github/workflows/antsibull-build.yml
+++ b/.github/workflows/antsibull-build.yml
@@ -28,12 +28,12 @@ jobs:
             options: '-e antsibull_ansible_version=8.99.0'
             python: '3.9'
             antsibull_changelog_ref: 0.14.0
-            antsibull_core_ref: main
+            antsibull_core_ref: stable-2
           - name: Ansible 9
             options: '-e antsibull_ansible_version=9.99.0'
             python: '3.11'
             antsibull_changelog_ref: main
-            antsibull_core_ref: main
+            antsibull_core_ref: stable-2
           - name: Ansible 10
             options: '-e antsibull_ansible_version=10.99.0'
             python: '3.12'
diff --git a/pyproject.toml b/pyproject.toml
index 919ec58c..a32d90f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 requires-python = ">=3.9"
 dependencies = [
     "antsibull-changelog >= 0.14.0",
-    "antsibull-core >= 2.0.0, < 3.0.0",
+    "antsibull-core >= 2.0.0, <= 3.0.0.dev0",
     "asyncio-pool",
     "build",
     "jinja2",