diff --git a/.gitmodules b/.gitmodules
index 0654f55..e69de29 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +0,0 @@
-[submodule "source"]
-	path = openblas-src/source
-	url = https://github.com/xianyi/OpenBLAS.git
diff --git a/openblas-build/src/build.rs b/openblas-build/src/build.rs
index 4c13178..22fdf08 100644
--- a/openblas-build/src/build.rs
+++ b/openblas-build/src/build.rs
@@ -434,16 +434,28 @@ mod tests {
         ));
     }
 
+    fn get_openblas_source() -> PathBuf {
+        let openblas_src_root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../openblas-src");
+        let openblas_version = "0.3.21";
+        let source = openblas_src_root.join(format!("OpenBLAS-{}", openblas_version));
+        if !source.exists() {
+            Command::new("tar")
+                .arg("xf")
+                .arg(format!("OpenBLAS-{}.tar.gz", openblas_version))
+                .current_dir(openblas_src_root)
+                .status()
+                .expect("tar command not found");
+        }
+        source
+    }
+
     #[ignore]
     #[test]
     fn build_default() {
         let root = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
         let opt = Configure::default();
         let _detail = opt
-            .build(
-                root.join("../openblas-src/source"),
-                root.join("test_build/build_default"),
-            )
+            .build(get_openblas_source(), root.join("test_build/build_default"))
             .unwrap();
     }
 
@@ -455,7 +467,7 @@ mod tests {
         opt.no_shared = true;
         let detail = opt
             .build(
-                root.join("../openblas-src/source"),
+                get_openblas_source(),
                 root.join("test_build/build_no_shared"),
             )
             .unwrap();
@@ -470,7 +482,7 @@ mod tests {
         opt.no_lapacke = true;
         let detail = opt
             .build(
-                root.join("../openblas-src/source"),
+                get_openblas_source(),
                 root.join("test_build/build_no_lapacke"),
             )
             .unwrap();
@@ -486,10 +498,7 @@ mod tests {
         let mut opt = Configure::default();
         opt.use_openmp = true;
         let detail = opt
-            .build(
-                root.join("../openblas-src/source"),
-                root.join("test_build/build_openmp"),
-            )
+            .build(get_openblas_source(), root.join("test_build/build_openmp"))
             .unwrap();
         assert!(detail.shared_lib.unwrap().has_lib("gomp"));
     }
diff --git a/openblas-src/.gitignore b/openblas-src/.gitignore
new file mode 100644
index 0000000..8c88798
--- /dev/null
+++ b/openblas-src/.gitignore
@@ -0,0 +1 @@
+OpenBLAS-*/
diff --git a/openblas-src/OpenBLAS-0.3.21.tar.gz b/openblas-src/OpenBLAS-0.3.21.tar.gz
new file mode 100644
index 0000000..63ac0be
Binary files /dev/null and b/openblas-src/OpenBLAS-0.3.21.tar.gz differ
diff --git a/openblas-src/build.rs b/openblas-src/build.rs
index bdb456e..adcd2d5 100644
--- a/openblas-src/build.rs
+++ b/openblas-src/build.rs
@@ -1,5 +1,7 @@
 use std::{env, path::*, process::Command};
 
+const OPENBLAS_VERSION: &str = "0.3.21";
+
 fn feature_enabled(feature: &str) -> bool {
     env::var(format!("CARGO_FEATURE_{}", feature.to_uppercase())).is_ok()
 }
@@ -158,7 +160,16 @@ fn build() {
         );
     }
 
-    let source = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("source");
+    let source =
+        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join(format!("OpenBLAS-{}", OPENBLAS_VERSION));
+    if !source.exists() {
+        Command::new("tar")
+            .arg("xf")
+            .arg(format!("OpenBLAS-{}.tar.gz", OPENBLAS_VERSION))
+            .current_dir(env!("CARGO_MANIFEST_DIR"))
+            .status()
+            .expect("tar command not found");
+    }
     let deliv = cfg.build(&source, &output).unwrap();
 
     println!("cargo:rustc-link-search={}", output.display());
@@ -233,7 +244,13 @@ fn build() {
         if source_tmp.exists() {
             fs::remove_dir_all(&source_tmp).unwrap();
         }
-        run(Command::new("cp").arg("-R").arg("source").arg(&source_tmp));
+        run(Command::new("tar")
+            .arg("xf")
+            .arg(format!("OpenBLAS-{}.tar.gz", OPENBLAS_VERSION)));
+        run(Command::new("cp")
+            .arg("-R")
+            .arg(format!("OpenBLAS-{}", OPENBLAS_VERSION))
+            .arg(&source_tmp));
         fs::rename(&source_tmp, &source).unwrap();
     }
     for name in &vec!["CC", "FC", "HOSTCC"] {
diff --git a/openblas-src/source b/openblas-src/source
deleted file mode 160000
index b89fb70..0000000
--- a/openblas-src/source
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b89fb708caa5a5a32de8f4306c4ff132e0228e9a