diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ff827e0..cf746a1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -128,6 +128,7 @@ jobs:
           cmake -S . -B build -GNinja \
             -DCMAKE_BUILD_TYPE=Release \
             -DKTIR_ENABLE_PYTHON_BINDINGS=ON \
+            -DMLIR_PYTHON_STUBGEN_ENABLED=ON \
             -DPython3_EXECUTABLE=${{ env.PYTHON }} \
             -DPython_EXECUTABLE=${{ env.PYTHON }} \
             -DMLIR_DIR=${{ env.MLIR_DIR }} \
diff --git a/pyproject.toml b/pyproject.toml
index cc132c1..4d59de3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,10 @@
 [build-system]
-requires = ["scikit-build-core", "nanobind>=2.12.0"]
+# cmake>=4.0 is required: CMake 3.x writes the full target name into the
+# file-API reply filename, and MLIR's mlir_generate_type_stubs() builds a
+# 283-char target name by joining DEPENDS_TARGETS. That overflows NAME_MAX
+# (255), so scikit-build-core fails with ENAMETOOLONG while reading the
+# reply. CMake 4.0.0 truncates the name and relies on the trailing hash.
+requires = ["scikit-build-core", "nanobind>=2.12.0", "cmake>=4.0", "ninja>=1.11"]
 build-backend = "scikit_build_core.build"
 
 [project]
@@ -31,7 +36,7 @@ MLIR_PYTHON_STUBGEN_ENABLED = "ON"
 
 [dependency-groups]
 # Base build tools for all LLVM builds (stable and nightly).
-llvm-build = ["cmake", "ninja", "sccache"]
+llvm-build = ["cmake>=4.0", "ninja>=1.11", "sccache>=0.8"]
 # numpy<2 is additionally required by check-mlir's Python test suite (nightly only).
 # numpy 2.x causes a dense-element ABI mismatch with MLIR at this LLVM version.
 # Stable builds skip check-mlir, so they use llvm-build directly.
diff --git a/uv.lock b/uv.lock
index 0424188..f494468 100644
--- a/uv.lock
+++ b/uv.lock
@@ -63,15 +63,15 @@ provides-extras = ["test"]
 
 [package.metadata.requires-dev]
 llvm-build = [
-    { name = "cmake" },
-    { name = "ninja" },
-    { name = "sccache" },
+    { name = "cmake", specifier = ">=4.0" },
+    { name = "ninja", specifier = ">=1.11" },
+    { name = "sccache", specifier = ">=0.8" },
 ]
 llvm-build-nightly = [
-    { name = "cmake" },
-    { name = "ninja" },
+    { name = "cmake", specifier = ">=4.0" },
+    { name = "ninja", specifier = ">=1.11" },
     { name = "numpy", specifier = "<2" },
-    { name = "sccache" },
+    { name = "sccache", specifier = ">=0.8" },
 ]
 
 [[package]]