diff --git a/Cargo.lock b/Cargo.lock
index 35969a4ff6..585a6e904b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -479,7 +479,7 @@ checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
 
 [[package]]
 name = "libgit2-sys"
-version = "0.18.3+1.9.2"
+version = "0.18.4+1.9.3"
 dependencies = [
  "cc",
  "libc",
diff --git a/Cargo.toml b/Cargo.toml
index 89f6de2ac5..0e1747cdea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ url = { version = "2.5.4", optional = true }
 bitflags = "2.1.0"
 libc = "0.2"
 log = "0.4.8"
-libgit2-sys = { path = "libgit2-sys", version = "0.18.3" }
+libgit2-sys = { path = "libgit2-sys", version = "0.18.4" }
 
 [target."cfg(all(unix, not(target_os = \"macos\")))".dependencies]
 openssl-sys = { version = "0.9.45", optional = true }
diff --git a/libgit2-sys/CHANGELOG.md b/libgit2-sys/CHANGELOG.md
index 261d259f53..eff341545d 100644
--- a/libgit2-sys/CHANGELOG.md
+++ b/libgit2-sys/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## 0.18.4+1.9.3 - 2026-05-04
+[0.18.3...0.18.4](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.18.3+1.9.2...libgit2-sys-0.18.4+1.9.3)
+
+### Changed
+
+- Updated to libgit2 [1.9.3](https://github.com/libgit2/libgit2/releases/tag/v1.9.3)
+  [#1242](https://github.com/rust-lang/git2-rs/pull/1242)
+
+### Added
+
+- Added binding for `git_remote_oid_type`
+  [#1242](https://github.com/rust-lang/git2-rs/pull/1242)
+- Added `GIT_REPOSITORY_INIT_RELATIVE_GITLINK` flag
+  [#1242](https://github.com/rust-lang/git2-rs/pull/1242)
+
 ## 0.18.3+1.9.2 - 2025-12-06
 [0.18.2...0.18.3](https://github.com/rust-lang/git2-rs/compare/libgit2-sys-0.18.2+1.9.1...libgit2-sys-0.18.3+1.9.2)
 
diff --git a/libgit2-sys/Cargo.toml b/libgit2-sys/Cargo.toml
index 2229760846..fef7805729 100644
--- a/libgit2-sys/Cargo.toml
+++ b/libgit2-sys/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "libgit2-sys"
-version = "0.18.3+1.9.2"
+version = "0.18.4+1.9.3"
 authors = ["Josh Triplett <josh@joshtriplett.org>", "Alex Crichton <alex@alexcrichton.com>"]
 links = "git2"
 build = "build.rs"
diff --git a/libgit2-sys/build.rs b/libgit2-sys/build.rs
index 0803601af2..b45118c9b5 100644
--- a/libgit2-sys/build.rs
+++ b/libgit2-sys/build.rs
@@ -9,7 +9,7 @@ fn try_system_libgit2(
     experimental_sha256: bool,
 ) -> Result<pkg_config::Library, Box<dyn std::error::Error>> {
     let mut cfg = pkg_config::Config::new();
-    let range_version = "1.9.2".."1.10.0";
+    let range_version = "1.9.3".."1.10.0";
 
     let lib = if experimental_sha256 {
         // Determine whether experimental SHA256 object support is enabled.
diff --git a/libgit2-sys/lib.rs b/libgit2-sys/lib.rs
index 770d99eca6..40de36c54e 100644
--- a/libgit2-sys/lib.rs
+++ b/libgit2-sys/lib.rs
@@ -1240,6 +1240,7 @@ git_enum! {
         GIT_REPOSITORY_INIT_MKDIR             = 1 << 3,
         GIT_REPOSITORY_INIT_MKPATH            = 1 << 4,
         GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE = 1 << 5,
+        GIT_REPOSITORY_INIT_RELATIVE_GITLINK  = 1 << 6,
     }
 }
 
@@ -2651,6 +2652,7 @@ extern "C" {
         size: *mut size_t,
         remote: *mut git_remote,
     ) -> c_int;
+    pub fn git_remote_oid_type(out: *mut git_oid_t, remote: *mut git_remote) -> c_int;
     pub fn git_remote_set_autotag(
         repo: *mut git_repository,
         remote: *const c_char,
diff --git a/libgit2-sys/libgit2 b/libgit2-sys/libgit2
index ca225744b9..1affb8b193 160000
--- a/libgit2-sys/libgit2
+++ b/libgit2-sys/libgit2
@@ -1 +1 @@
-Subproject commit ca225744b992bf2bf24e9a2eb357ddef78179667
+Subproject commit 1affb8b19346c4f90e163a9a0364959ff1410f64