diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b5e49600..6593e1e7 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -25,6 +25,17 @@ updates:
       - "dependencies"
       - "rust"
     groups:
+      # pyo3 and rust-numpy are lockstep (numpy 0.N requires pyo3 ^0.N), so
+      # a lone bump of either cannot compile. Listed first so they land in
+      # this group rather than rust-minor-patch.
+      pyo3-stack:
+        patterns:
+          - "pyo3"
+          - "numpy"
+        update-types:
+          - "major"
+          - "minor"
+          - "patch"
       rust-minor-patch:
         update-types:
           - "minor"
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 4c253cd8..2c0c9772 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -25,9 +25,10 @@ openblas = ["ndarray/blas"]
 alloc-profile = []
 
 [dependencies]
-# PyO3 0.29 supports Python 3.9-3.14
-pyo3 = "0.29"
-numpy = "0.29"
+# PyO3 0.30 supports Python 3.9-3.15 (pyo3 and numpy must move together:
+# rust-numpy 0.N requires pyo3 ^0.N)
+pyo3 = "0.30"
+numpy = "0.30"
 ndarray = { version = "0.17", features = ["rayon"] }
 rand = "0.10"
 rand_xoshiro = "0.8"