diff --git a/Cargo.toml b/Cargo.toml
index 25cb8c1cacc..7c4e3ab6257 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ pretty_env_logger = { version = "0.4", optional = true }
 anyhow = "1.0"
 filetime = "0.2.9"
 flate2 = { version = "1.0.3", default-features = false, features = ["zlib"] }
-git2 = "0.13.14"
+git2 = "0.13.16"
 git2-curl = "0.14.1"
 glob = "0.3.0"
 hex = "0.4"
@@ -44,7 +44,7 @@ jobserver = "0.1.21"
 lazycell = "1.2.0"
 libc = "0.2"
 log = "0.4.6"
-libgit2-sys = "0.12.16"
+libgit2-sys = "0.12.18"
 memchr = "2.1.3"
 num_cpus = "1.0"
 opener = "0.4"
diff --git a/crates/cargo-test-support/Cargo.toml b/crates/cargo-test-support/Cargo.toml
index 0340c466765..0c62e2da1fa 100644
--- a/crates/cargo-test-support/Cargo.toml
+++ b/crates/cargo-test-support/Cargo.toml
@@ -13,7 +13,7 @@ cargo = { path = "../.." }
 cargo-test-macro = { path = "../cargo-test-macro" }
 filetime = "0.2"
 flate2 = { version = "1.0", default-features = false, features = ["zlib"] }
-git2 = "0.13"
+git2 = "0.13.16"
 glob = "0.3"
 lazy_static = "1.0"
 remove_dir_all = "0.5"
diff --git a/crates/cargo-test-support/src/git.rs b/crates/cargo-test-support/src/git.rs
index c698fded541..cc6b0c7462a 100644
--- a/crates/cargo-test-support/src/git.rs
+++ b/crates/cargo-test-support/src/git.rs
@@ -41,6 +41,7 @@ use some of the helper functions in this file to interact with the repository.
 use crate::{path2url, project, Project, ProjectBuilder};
 use std::fs;
 use std::path::{Path, PathBuf};
+use std::sync::Once;
 use url::Url;
 
 #[must_use]
@@ -124,11 +125,25 @@ impl Repository {
 
 /// Initialize a new repository at the given path.
 pub fn init(path: &Path) -> git2::Repository {
+    default_search_path();
     let repo = t!(git2::Repository::init(path));
     default_repo_cfg(&repo);
     repo
 }
 
+fn default_search_path() {
+    use crate::paths::GLOBAL_ROOT;
+    use git2::{opts::set_search_path, ConfigLevel};
+    static INIT: Once = Once::new();
+    INIT.call_once(|| unsafe {
+        let path = GLOBAL_ROOT.join("blank_git_search_path");
+        t!(set_search_path(ConfigLevel::System, &path));
+        t!(set_search_path(ConfigLevel::Global, &path));
+        t!(set_search_path(ConfigLevel::XDG, &path));
+        t!(set_search_path(ConfigLevel::ProgramData, &path));
+    })
+}
+
 fn default_repo_cfg(repo: &git2::Repository) {
     let mut cfg = t!(repo.config());
     t!(cfg.set_str("user.email", "foo@bar.com"));
diff --git a/crates/cargo-test-support/src/paths.rs b/crates/cargo-test-support/src/paths.rs
index 61f9c03aea4..2a976987d79 100644
--- a/crates/cargo-test-support/src/paths.rs
+++ b/crates/cargo-test-support/src/paths.rs
@@ -14,7 +14,7 @@ use std::sync::Mutex;
 static CARGO_INTEGRATION_TEST_DIR: &str = "cit";
 
 lazy_static! {
-    static ref GLOBAL_ROOT: PathBuf = {
+    pub static ref GLOBAL_ROOT: PathBuf = {
         let mut path = t!(env::current_exe());
         path.pop(); // chop off exe name
         path.pop(); // chop off 'debug'
diff --git a/tests/testsuite/cache_messages.rs b/tests/testsuite/cache_messages.rs
index d823a4d2528..b02c133a5ae 100644
--- a/tests/testsuite/cache_messages.rs
+++ b/tests/testsuite/cache_messages.rs
@@ -105,7 +105,7 @@ fn color() {
         return s.replace("\x1b[0m\x1b[0m", "\x1b[0m");
         #[cfg(not(windows))]
         return s.to_string();
-    };
+    }
 
     let compare = |a, b| {
         assert_eq!(normalize(a), normalize(b));