diff --git a/Cargo.toml b/Cargo.toml
index 27e552a3c4c..319037cde80 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,8 +28,8 @@ curl-sys = "0.4.61"
 env_logger = "0.10.0"
 filetime = "0.2.9"
 flate2 = { version = "1.0.3", default-features = false, features = ["zlib"] }
-git2 = "0.16.0"
-git2-curl = "0.17.0"
+git2 = "0.17.0"
+git2-curl = "0.18.0"
 gix = { version = "0.39.0", default-features = false, features = ["blocking-http-transport-curl", "progress-tree"] }
 gix-features-for-configuration-only = { version = "0.28.0", package = "gix-features", features = [ "parallel" ] }
 glob = "0.3.0"
@@ -47,9 +47,7 @@ jobserver = "0.1.26"
 lazy_static = "1.2.0"
 lazycell = "1.2.0"
 libc = "0.2"
-# Temporarily pin libgit2-sys due to some issues with SSH not working on
-# Windows.
-libgit2-sys = "=0.14.1"
+libgit2-sys = "0.15.0"
 log = "0.4.6"
 memchr = "2.1.3"
 opener = "0.5"
diff --git a/crates/cargo-test-support/Cargo.toml b/crates/cargo-test-support/Cargo.toml
index 6c4b2518255..91e6e4e34c1 100644
--- a/crates/cargo-test-support/Cargo.toml
+++ b/crates/cargo-test-support/Cargo.toml
@@ -14,7 +14,7 @@ cargo-util = { path = "../cargo-util" }
 crates-io = { path = "../crates-io" }
 filetime = "0.2"
 flate2 = { version = "1.0", default-features = false, features = ["zlib"] }
-git2 = "0.16.0"
+git2 = "0.17.0"
 glob = "0.3"
 itertools = "0.10.0"
 lazy_static = "1.0"
diff --git a/src/cargo/sources/git/utils.rs b/src/cargo/sources/git/utils.rs
index c7fce1f5e21..a7ffccf79a4 100644
--- a/src/cargo/sources/git/utils.rs
+++ b/src/cargo/sources/git/utils.rs
@@ -567,7 +567,7 @@ where
         }
 
         // Whelp, we tried our best
-        Err(git2::Error::from_str("no authentication available"))
+        Err(git2::Error::from_str("no authentication methods succeeded"))
     });
 
     // Ok, so if it looks like we're going to be doing ssh authentication, we
@@ -612,7 +612,7 @@ where
                         return git2::Cred::ssh_key_from_agent(&s);
                     }
                 }
-                Err(git2::Error::from_str("no authentication available"))
+                Err(git2::Error::from_str("no authentication methods succeeded"))
             });
 
             // If we made two attempts then that means:
diff --git a/tests/testsuite/https.rs b/tests/testsuite/https.rs
index c7aec911105..501eeae0558 100644
--- a/tests/testsuite/https.rs
+++ b/tests/testsuite/https.rs
@@ -30,7 +30,7 @@ fn self_signed_should_fail() {
         .build();
     // I think the text here depends on the curl backend.
     let err_msg = if cfg!(target_os = "macos") {
-        "untrusted connection error; class=Ssl (16); code=Certificate (-17)"
+        "unexpected return value from ssl handshake -9806; class=Ssl (16)"
     } else if cfg!(unix) {
         "the SSL certificate is invalid; class=Ssl (16); code=Certificate (-17)"
     } else if cfg!(windows) {
diff --git a/tests/testsuite/ssh.rs b/tests/testsuite/ssh.rs
index 31c51c3dd3d..d1701d32d6b 100644
--- a/tests/testsuite/ssh.rs
+++ b/tests/testsuite/ssh.rs
@@ -469,11 +469,6 @@ Caused by:
   failed to authenticate when downloading repository
 
   *";
-    let err = if cfg!(windows) {
-        "error authenticating: unable to connect to agent pipe; class=Ssh (23)"
-    } else {
-        "error authenticating: failed connecting with agent; class=Ssh (23)"
-    };
     let expected = if cargo_uses_gitoxide() {
         format!(
             "{shared_stderr} attempted to find username/password via `credential.helper`, but maybe the found credentials were incorrect
@@ -496,7 +491,7 @@ Caused by:
   https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
 
 Caused by:
-  {err}
+  no authentication methods succeeded
 "
         )
     };
@@ -546,7 +541,7 @@ Caused by:
   https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
 
 Caused by:
-  {err}
+  no authentication methods succeeded
 "
         )
     };