diff --git a/.gitmodules b/.gitmodules
index cf61ca1..a45cf90 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,11 @@
 [submodule "libmimalloc-sys/c_src/mimalloc"]
 	path = libmimalloc-sys/c_src/mimalloc
 	url = https://github.com/microsoft/mimalloc
+[submodule "libmimalloc-sys/c_src/mimalloc_dev"]
+	path = libmimalloc-sys/c_src/mimalloc_dev
+	url = https://github.com/microsoft/mimalloc.git
+	branch = dev
+[submodule "libmimalloc-sys/c_src/mimalloc_dev_slice"]
+	path = libmimalloc-sys/c_src/mimalloc_dev_slice
+	url = https://github.com/microsoft/mimalloc.git
+	branch = dev-slice
diff --git a/Cargo.toml b/Cargo.toml
index f40838a..a5190f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,3 +30,11 @@ override = ["libmimalloc-sys/override"]
 debug = ["libmimalloc-sys/debug"]
 debug_in_debug = ["libmimalloc-sys/debug_in_debug"]
 local_dynamic_tls = ["libmimalloc-sys/local_dynamic_tls"]
+
+# Allow to select different mimalloc branch
+v1_dev = ["libmimalloc-sys/v1_dev"] # v1 dev branch
+v2_dev = ["libmimalloc-sys/v2_dev"] # v2 dev-slice branch
+# Trigger git submodule update to have the latest upstream commit to be used
+# This will be for all submodules, master, dev and dev-slice
+# Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+submodule_update = ["libmimalloc-sys/submodule_update"]
diff --git a/libmimalloc-sys/Cargo.toml b/libmimalloc-sys/Cargo.toml
index 4e2b97e..f8ec18f 100644
--- a/libmimalloc-sys/Cargo.toml
+++ b/libmimalloc-sys/Cargo.toml
@@ -24,6 +24,14 @@ override = []
 extended = ["cty"]
 local_dynamic_tls = []
 
+# Allow to select different mimalloc branch
+v1_dev = [] # v1 dev branch
+v2_dev = [] # v2 dev-slice branch
+# Trigger git submodule update to have the latest upstream commit to be used
+# This will be for all submodules, master, dev and dev-slice
+# Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+submodule_update = []
+
 # Show `extended` on docs.rs since it's the full API surface.
 [package.metadata.docs.rs]
 features = ["extended"]
diff --git a/libmimalloc-sys/build.rs b/libmimalloc-sys/build.rs
index 7cc9379..e9b8f50 100644
--- a/libmimalloc-sys/build.rs
+++ b/libmimalloc-sys/build.rs
@@ -1,11 +1,37 @@
 use std::env;
+use std::process::Command;
 
 fn main() {
+    // Update the submodule's if the `submodule_update` feature is enabled.
+    // This ensures the latests commits are used to build this package.
+    // Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+    if cfg!(feature = "submodule_update") {
+        // Init or update the submodule with libui if needed
+        Command::new("git")
+            .args(&["version"])
+            .status()
+            .expect("Git does not appear to be installed. Error");
+        Command::new("git")
+            .args(&["submodule", "update", "--init", "--recursive", "--remote"])
+            .status()
+            .expect("Unable to update mimalloc submodule branches. Error");
+    }
+
     let mut build = cc::Build::new();
 
-    build.include("c_src/mimalloc/include");
-    build.include("c_src/mimalloc/src");
-    build.file("c_src/mimalloc/src/static.c");
+    if cfg!(feature = "v1_dev") {
+        build.include("c_src/mimalloc_dev/include");
+        build.include("c_src/mimalloc_dev/src");
+        build.file("c_src/mimalloc_dev/src/static.c");
+    } else if cfg!(feature = "v2_dev") {
+        build.include("c_src/mimalloc_dev_slice/include");
+        build.include("c_src/mimalloc_dev_slice/src");
+        build.file("c_src/mimalloc_dev_slice/src/static.c");
+    } else {
+        build.include("c_src/mimalloc/include");
+        build.include("c_src/mimalloc/src");
+        build.file("c_src/mimalloc/src/static.c");
+    }
 
     let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
     let target_family = env::var("CARGO_CFG_TARGET_FAMILY").expect("target_family not defined!");
diff --git a/libmimalloc-sys/c_src/mimalloc_dev b/libmimalloc-sys/c_src/mimalloc_dev
new file mode 160000
index 0000000..ccf117c
--- /dev/null
+++ b/libmimalloc-sys/c_src/mimalloc_dev
@@ -0,0 +1 @@
+Subproject commit ccf117c43d11bce115c9672d50c370c7d35739a7
diff --git a/libmimalloc-sys/c_src/mimalloc_dev_slice b/libmimalloc-sys/c_src/mimalloc_dev_slice
new file mode 160000
index 0000000..18c1891
--- /dev/null
+++ b/libmimalloc-sys/c_src/mimalloc_dev_slice
@@ -0,0 +1 @@
+Subproject commit 18c18917081e10c4a64e76c6b887ca0fa42fd345
diff --git a/libmimalloc-sys/src/extended.rs b/libmimalloc-sys/src/extended.rs
index 1647166..a7bedcc 100644
--- a/libmimalloc-sys/src/extended.rs
+++ b/libmimalloc-sys/src/extended.rs
@@ -512,11 +512,18 @@ pub const mi_option_large_os_pages: mi_option_t = 6;
 /// allocate just a little to take up space in the huge OS page area (which cannot be reset).
 pub const mi_option_reserve_huge_os_pages: mi_option_t = 7;
 
-/// TODO: update later
-pub const mi_option_reserve_os_memory: mi_option_t = 8;
+/// Option (experimental) reserve huge OS pages at a specific NUMA node
+///
+/// The huge pages are usually allocated evenly among NUMA nodes.
+/// You can use mi_option_reserve_huge_os_pages_at=N where `N` is the numa node (starting at 0) to allocate all
+/// the huge pages at a specific numa node instead.
+pub const mi_option_reserve_huge_os_pages_at: mi_option_t = 8;
+
+/// Option (experimental) reserve specified amount of OS memory at startup
+pub const mi_option_reserve_os_memory: mi_option_t = 9;
 
 /// Option (experimental) specifying number of segments per thread to keep cached.
-pub const mi_option_segment_cache: mi_option_t = 9;
+pub const mi_option_segment_cache: mi_option_t = 10;
 
 /// Option (experimental) to reset page memory after mi_option_reset_delay milliseconds when it becomes free.
 ///
@@ -528,19 +535,19 @@ pub const mi_option_segment_cache: mi_option_t = 9;
 /// off completely.
 ///
 /// Default: 1 (true)
-pub const mi_option_page_reset: mi_option_t = 10;
+pub const mi_option_page_reset: mi_option_t = 11;
 
 /// Experimental
-pub const mi_option_abandoned_page_reset: mi_option_t = 11;
+pub const mi_option_abandoned_page_reset: mi_option_t = 12;
 
 /// Experimental
-pub const mi_option_segment_reset: mi_option_t = 12;
+pub const mi_option_segment_reset: mi_option_t = 13;
 
 /// Experimental
-pub const mi_option_eager_commit_delay: mi_option_t = 13;
+pub const mi_option_eager_commit_delay: mi_option_t = 14;
 
 /// Option (experimental) specifying delay in milli-seconds before resetting a page (100ms by default).
-pub const mi_option_reset_delay: mi_option_t = 14;
+pub const mi_option_reset_delay: mi_option_t = 15;
 
 /// Option (experimental) to pretend there are at most N NUMA nodes.
 ///
@@ -549,19 +556,19 @@ pub const mi_option_reset_delay: mi_option_t = 14;
 /// actual NUMA nodes is fine and will only cause threads to potentially allocate more
 /// memory across actual NUMA nodes (but this can happen in any case as NUMA local
 /// allocation is always a best effort but not guaranteed).
-pub const mi_option_use_numa_nodes: mi_option_t = 15;
+pub const mi_option_use_numa_nodes: mi_option_t = 16;
 
 /// TODO: update later
-pub const mi_option_limit_os_alloc: mi_option_t = 16;
+pub const mi_option_limit_os_alloc: mi_option_t = 17;
 
 /// Option (experimental) specifying OS tag to assign to mimalloc'd memory.
-pub const mi_option_os_tag: mi_option_t = 17;
+pub const mi_option_os_tag: mi_option_t = 18;
 
 /// Experimental
-pub const mi_option_max_errors: mi_option_t = 18;
+pub const mi_option_max_errors: mi_option_t = 19;
 
 /// Experimental
-pub const mi_option_max_warnings: mi_option_t = 19;
+pub const mi_option_max_warnings: mi_option_t = 20;
 
 extern "C" {
     // Note: mi_option_{enable,disable} aren't exposed because they're redundant
diff --git a/libmimalloc-sys/sys-test/Cargo.toml b/libmimalloc-sys/sys-test/Cargo.toml
index 19c47a6..89fb748 100644
--- a/libmimalloc-sys/sys-test/Cargo.toml
+++ b/libmimalloc-sys/sys-test/Cargo.toml
@@ -12,4 +12,4 @@ libmimalloc-sys = { path = "..", features = ["extended"] }
 libc = "0.2"
 
 [build-dependencies]
-ctest = "0.2"
+ctest2 = "0.4"
diff --git a/libmimalloc-sys/sys-test/build.rs b/libmimalloc-sys/sys-test/build.rs
index aad27a1..5aabf83 100644
--- a/libmimalloc-sys/sys-test/build.rs
+++ b/libmimalloc-sys/sys-test/build.rs
@@ -1,5 +1,5 @@
 fn main() {
-    let mut cfg = ctest::TestGenerator::new();
+    let mut cfg = ctest2::TestGenerator::new();
     cfg.header("mimalloc.h")
         .include(concat!(
             env!("CARGO_MANIFEST_DIR"),
diff --git a/libmimalloc-sys/sys-test/src/main.rs b/libmimalloc-sys/sys-test/src/main.rs
index d637386..01a307b 100644
--- a/libmimalloc-sys/sys-test/src/main.rs
+++ b/libmimalloc-sys/sys-test/src/main.rs
@@ -1,4 +1,4 @@
-#![allow(bad_style, clippy::all)]
+#![allow(bad_style, deprecated, clippy::all)]
 
 use libmimalloc_sys::*;