diff --git a/.gitignore b/.gitignore
index 1a3a04c..0a20e0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,3 @@
 /libmimalloc-sys-0.1.28.crate
 /libmimalloc-sys-0.1.30.crate
 /libmimalloc-sys-0.1.33.crate
-/libmimalloc-sys-0.1.35.crate
-/libmimalloc-sys-0.1.38.crate
-/libmimalloc-sys-0.1.39.crate
-/libmimalloc-sys-0.1.42.crate
-/libmimalloc-sys-0.1.44.crate
diff --git a/get-bundled-mimalloc-ver.sh b/get-bundled-mimalloc-ver.sh
deleted file mode 100755
index ba2b568..0000000
--- a/get-bundled-mimalloc-ver.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-for v in 2 3; do
-  grep "define MI_MALLOC_VERSION" libmimalloc-sys-*/c_src/mimalloc/v$v/include/mimalloc.h | cut -d' ' -f3 | fold -w1 | paste -sd.
-done
diff --git a/rust-libmimalloc-sys.spec b/rust-libmimalloc-sys.spec
index 82cc4f9..4b5b4b3 100644
--- a/rust-libmimalloc-sys.spec
+++ b/rust-libmimalloc-sys.spec
@@ -1,11 +1,11 @@
-# Generated by rust2rpm 27
-%bcond check 1
+# Generated by rust2rpm 24
+%bcond_without check
 %global debug_package %{nil}
 
 %global crate libmimalloc-sys
 
 Name:           rust-libmimalloc-sys
-Version:        0.1.44
+Version:        0.1.33
 Release:        %autorelease
 Summary:        Sys crate wrapping the mimalloc allocator
 
@@ -13,14 +13,11 @@ License:        MIT
 URL:            https://crates.io/crates/libmimalloc-sys
 Source:         %{crates_source}
 
-BuildRequires:  cargo-rpm-macros >= 24
+BuildRequires:  rust-packaging >= 21
 
 # TODO: get this to build against system mimalloc
 # or ask mimalloc dev to switch to mimalloc-sys
-# https://github.com/purpleprotocol/mimalloc_rust/issues/73
-# use get-bundled-mimalloc-ver.sh after unpacking the crate
-Provides:       bundled(mimalloc) = 2.2.4
-Provides:       bundled(mimalloc) = 3.1.5
+Provides:       bundled(mimalloc) = 2.1.2
 
 %global _description %{expand:
 Sys crate wrapping the mimalloc allocator.}
@@ -38,8 +35,7 @@ use the "%{crate}" crate.
 
 %files          devel
 %license %{crate_instdir}/LICENSE.txt
-%license %{crate_instdir}/c_src/mimalloc/v2/LICENSE
-%license %{crate_instdir}/c_src/mimalloc/v3/LICENSE
+%license %{crate_instdir}/c_src/mimalloc/LICENSE
 %{crate_instdir}/
 
 %package     -n %{name}+default-devel
@@ -54,18 +50,6 @@ use the "default" feature of the "%{crate}" crate.
 %files       -n %{name}+default-devel
 %ghost %{crate_instdir}/Cargo.toml
 
-%package     -n %{name}+arena-devel
-Summary:        %{summary}
-BuildArch:      noarch
-
-%description -n %{name}+arena-devel %{_description}
-
-This package contains library source intended for building other packages which
-use the "arena" feature of the "%{crate}" crate.
-
-%files       -n %{name}+arena-devel
-%ghost %{crate_instdir}/Cargo.toml
-
 %package     -n %{name}+cty-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -126,18 +110,6 @@ use the "local_dynamic_tls" feature of the "%{crate}" crate.
 %files       -n %{name}+local_dynamic_tls-devel
 %ghost %{crate_instdir}/Cargo.toml
 
-%package     -n %{name}+no_thp-devel
-Summary:        %{summary}
-BuildArch:      noarch
-
-%description -n %{name}+no_thp-devel %{_description}
-
-This package contains library source intended for building other packages which
-use the "no_thp" feature of the "%{crate}" crate.
-
-%files       -n %{name}+no_thp-devel
-%ghost %{crate_instdir}/Cargo.toml
-
 %package     -n %{name}+override-devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -162,20 +134,11 @@ use the "secure" feature of the "%{crate}" crate.
 %files       -n %{name}+secure-devel
 %ghost %{crate_instdir}/Cargo.toml
 
-%package     -n %{name}+v3-devel
-Summary:        %{summary}
-BuildArch:      noarch
-
-%description -n %{name}+v3-devel %{_description}
-
-This package contains library source intended for building other packages which
-use the "v3" feature of the "%{crate}" crate.
-
-%files       -n %{name}+v3-devel
-%ghost %{crate_instdir}/Cargo.toml
-
 %prep
-%autosetup -n %{crate}-%{version} -p1
+%autosetup -n %{crate}-%{version_no_tilde} -p1
+# these are Windows .exe and .dlls, and unneeded
+# see build.rs for the ones that are actually referenced
+rm -r c_src/mimalloc/bin
 %cargo_prep
 
 %generate_buildrequires
diff --git a/sources b/sources
index c39a392..960830a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (libmimalloc-sys-0.1.44.crate) = 18de89a1084ed2da37f9ea6357289e40fe95d86e8de2ee4567bba5453c2f622a116473e2baffeb086cdf814a4b7b12f6e05563992b0b88cf939abcc5a2584fc2
+SHA512 (libmimalloc-sys-0.1.33.crate) = ac2161b4324436ff55b421bd5d26c5c3a54da62319299b392f9aaebd65dcd5862b8f8488738959e7e45be3165259b251643416ddd9905ddf6580807136c71616