diff --git a/.gitignore b/.gitignore
index a7a581a..72e11ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,3 @@
 /cramjam-cdc7d307d0f592f89b3319a7037fd875a5371ef3-filtered.tar.gz
 /cramjam-2.10.0rc1.tar.gz
 /cramjam-2.10.0.tar.gz
-/cramjam-2.11.0rc2.tar.gz
-/cramjam-2.11.0rc3.tar.gz
-/cramjam-2.11.0.tar.gz
diff --git a/python-cramjam.spec b/python-cramjam.spec
index cb1b1c2..b734390 100644
--- a/python-cramjam.spec
+++ b/python-cramjam.spec
@@ -4,7 +4,7 @@
 #global snapdate YYYYMMDD
 
 Name:           python-cramjam
-Version:        2.11.0
+Version:        2.10.0
 Release:        %autorelease
 Summary:        Thin Python bindings to de/compression algorithms in Rust
 
@@ -33,9 +33,7 @@ Source1:        get_source
 
 %endif
 
-BuildSystem:            pyproject
-BuildOption(install):   -l cramjam
-
+BuildRequires:  python3-devel
 BuildRequires:  tomcli >= 0.8.0
 BuildRequires:  cargo-rpm-macros >= 24
 
@@ -44,6 +42,7 @@ BuildRequires:  cargo-rpm-macros >= 24
 # dev extra in pyproject.toml.
 BuildRequires:  %{py3_dist numpy}
 BuildRequires:  %{py3_dist pytest}
+BuildRequires:  %{py3_dist pytest-xdist}
 BuildRequires:  %{py3_dist hypothesis}
 %endif
 
@@ -57,6 +56,7 @@ BuildRequires:  %{py3_dist hypothesis}
 Summary:        %{summary}
 # 0BSD OR MIT OR Apache-2.0
 # Apache-2.0
+# Apache-2.0 OR MIT
 # BSD-3-Clause
 # BSD-3-Clause AND MIT
 # MIT
@@ -74,7 +74,9 @@ License:        %{shrink:
 %description -n python3-cramjam %{common_description}
 
 
-%prep -a
+%prep
+%autosetup -n cramjam-%{srcversion}
+
 # Downstream-only: patch out the generate-import-lib feature, which is only
 # relevant on Windows, and which depends on the corresponding pyo3 feature –
 # which is not packaged for that reason.
@@ -116,20 +118,33 @@ do
   fi
 done
 
+# EPEL10.0: SemVer-incompatible PyO3 0.24 blocked by policy, so use 0.23.
+tomcli set Cargo.toml str dependencies.pyo3.version '^0.23'
+tomcli set Cargo.toml str build-dependencies.pyo3-build-config '^0.23'
+
 %cargo_prep
 
 
-%generate_buildrequires -a
+%generate_buildrequires
+%pyproject_buildrequires
 %cargo_generate_buildrequires
 
 
-%build -p
+%build
 %cargo_license_summary
 %{cargo_license} > LICENSES.dependencies
+%pyproject_wheel
 
 
-%check -a
+%install
+%pyproject_install
+%pyproject_save_files -l cramjam
+
+
+%check
+%pyproject_check_import
 %if %{with tests}
+%if %{undefined el10}
 # Test failures in test_variants_decompress_into with recent hypothesis
 # versions: https://github.com/milesgranger/cramjam/issues/201
 #
@@ -139,13 +154,14 @@ done
 # not reason to believe that the package has *new* problems. It *might* have
 # newly *revealed* problems. This merits further investigation.
 k="${k-}${k+ and }not test_variants_decompress_into"
+%endif
 
 # Regression with miniz_oxide>0.8.5
 # https://github.com/milesgranger/cramjam/issues/211
 # Failed: DID NOT RAISE <class 'cramjam.DecompressionError'>
 k="${k-}${k+ and }not test_variants_raise_exception[deflate]"
 
-%pytest -k "${k-}" --ignore=benchmarks/test_bench.py -v
+%pytest -k "${k-}" --ignore=benchmarks/test_bench.py -v -n auto
 %endif
 
 
diff --git a/sources b/sources
index 9b98da9..d44109e 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (cramjam-2.11.0.tar.gz) = d92446c0c0ef885f3544783caa1f179fd50b6a6290ada011495b7385411527f75a2544c0c8cdc36910c83c879dbac7dd130f4fe8f3dc3b885a84a45286cb3695
+SHA512 (cramjam-2.10.0.tar.gz) = 0c44643844c6278160d9e2efa3005da265e464edb1d3dd670cadc3effaa744c21c772c0bfeac1ceec6e5f7e8a9a02440d79e5080c432e4dcb73984e613281ad2