diff --git a/noxfile.py b/noxfile.py
index 7a4598a5f..a184af60f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -90,7 +90,7 @@ def install_ci(session, group):
         extras += "aws,zarr,bionty"
         # for tiledbsoma, otherwise resolution fails for some reason
         run(session, "uv pip install --system scanpy>=1.10.0")
-        run(session, "uv pip install --system tiledbsoma>=1.15.0rc3,!=1.15.0rc4")
+        run(session, "uv pip install --system tiledbsoma==1.15.0rc3")
     elif group == "tutorial":
         extras += "aws,jupyter,bionty"
         run(session, "uv pip install --system huggingface_hub")