diff --git a/radicle-git-ext/Cargo.toml b/radicle-git-ext/Cargo.toml
index 1b61c35..93ff388 100644
--- a/radicle-git-ext/Cargo.toml
+++ b/radicle-git-ext/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "radicle-git-ext"
-version = "0.4.1"
+version = "0.4.2"
 authors = [
   "Alexis Sellier <alexis@radicle.xyz>",
   "Kim Altintop <kim@eagain.st>",
@@ -26,7 +26,7 @@ default-features = false
 features = ["vendored-libgit2"]
 
 [dependencies.git-ref-format]
-version = "0.2.1"
+version = "0.2.2"
 path = "./git-ref-format"
 features = ["macro", "serde", "minicbor"]
 
diff --git a/radicle-git-ext/git-ref-format/Cargo.toml b/radicle-git-ext/git-ref-format/Cargo.toml
index ba4d568..18421fe 100644
--- a/radicle-git-ext/git-ref-format/Cargo.toml
+++ b/radicle-git-ext/git-ref-format/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "git-ref-format"
-version = "0.2.1"
+version = "0.2.2"
 authors = [
   "Kim Altintop <kim@eagain.st>",
   "Fintan Halpenny <fintan.halpenny@gmail.com>",
diff --git a/radicle-git-ext/git-ref-format/core/src/refspec.rs b/radicle-git-ext/git-ref-format/core/src/refspec.rs
index 2b1d018..0e1967e 100644
--- a/radicle-git-ext/git-ref-format/core/src/refspec.rs
+++ b/radicle-git-ext/git-ref-format/core/src/refspec.rs
@@ -6,7 +6,7 @@
 use std::{
     borrow::{Borrow, Cow},
     convert::TryFrom,
-    fmt::{self, Display},
+    fmt::{self, Display, Write as _},
     iter::FromIterator,
     ops::Deref,
 };
@@ -558,3 +558,30 @@ impl Display for NamespacedPattern<'_> {
         self.0.fmt(f)
     }
 }
+
+/// A Git [refspec].
+///
+/// **Note** that this is a simplified version of a [refspec] where
+/// the `src` and `dst` are required and there is no way to construct
+/// a negative refspec, e.g. `^refs/heads/no-thanks`.
+///
+/// [refspec]: https://git-scm.com/book/en/v2/Git-Internals-The-Refspec
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Refspec<T, U> {
+    pub src: T,
+    pub dst: U,
+    pub force: bool,
+}
+
+impl<T, U> fmt::Display for Refspec<T, U>
+where
+    T: fmt::Display,
+    U: fmt::Display,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if self.force {
+            f.write_char('+')?;
+        }
+        write!(f, "{}:{}", self.src, self.dst)
+    }
+}
diff --git a/radicle-git-ext/src/commit.rs b/radicle-git-ext/src/commit.rs
index dbd51c9..9eaf772 100644
--- a/radicle-git-ext/src/commit.rs
+++ b/radicle-git-ext/src/commit.rs
@@ -149,8 +149,8 @@ impl Commit {
 fn verify_object(odb: &git2::Odb, oid: &Oid, expected: ObjectType) -> Result<(), error::Write> {
     use git2::{Error, ErrorClass, ErrorCode};
 
-    let (_, _, kind) = odb
-        .reader(*oid)
+    let (_, kind) = odb
+        .read_header(*oid)
         .map_err(|err| error::Write::OdbRead { oid: *oid, err })?;
     if kind != expected {
         Err(error::Write::NotCommit {
diff --git a/radicle-git-ext/src/commit/trailers.rs b/radicle-git-ext/src/commit/trailers.rs
index 7265d81..00b4c42 100644
--- a/radicle-git-ext/src/commit/trailers.rs
+++ b/radicle-git-ext/src/commit/trailers.rs
@@ -130,6 +130,19 @@ impl Deref for Token<'_> {
     }
 }
 
+impl<'a> TryFrom<&'a str> for Token<'a> {
+    type Error = &'static str;
+
+    fn try_from(s: &'a str) -> Result<Self, Self::Error> {
+        let is_token = s.chars().all(|c| c.is_alphanumeric() || c == '-');
+        if is_token {
+            Ok(Token(s))
+        } else {
+            Err("token contains invalid characters")
+        }
+    }
+}
+
 pub struct Display<'a> {
     trailer: &'a Trailer<'a>,
     separator: &'a str,
diff --git a/radicle-surf/Cargo.toml b/radicle-surf/Cargo.toml
index e4c824e..1cb97b7 100644
--- a/radicle-surf/Cargo.toml
+++ b/radicle-surf/Cargo.toml
@@ -2,7 +2,7 @@
 name = "radicle-surf"
 description = "A code surfing library for Git repositories"
 readme = "README.md"
-version = "0.10.1"
+version = "0.10.2"
 authors = ["The Radicle Team <dev@radicle.xyz>"]
 edition = "2021"
 homepage = "https://github.com/radicle-dev/radicle-surf"
@@ -38,7 +38,7 @@ default-features = false
 features = ["vendored-libgit2"]
 
 [dependencies.radicle-git-ext]
-version = "0.4.1"
+version = "0.4.2"
 path = "../radicle-git-ext"
 features = ["serde"]