diff --git a/config.example.toml b/config.example.toml
index 72197327..0f988a2c 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -106,6 +106,9 @@
 # greedy_cask = true
 # autoremove = true
 
+# Upgrade formulae built from the HEAD branch; `brew upgrade --fetch-HEAD`
+# fetch_head = true
+
 
 [linux]
 # Arch Package Manager to use.
diff --git a/src/config.rs b/src/config.rs
index c7b62cd2..3b01e0e7 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -254,6 +254,7 @@ pub struct Flatpak {
 pub struct Brew {
     greedy_cask: Option<bool>,
     autoremove: Option<bool>,
+    fetch_head: Option<bool>,
 }
 
 #[derive(Debug, Deserialize, Clone, Copy)]
@@ -1096,6 +1097,15 @@ impl Config {
             .unwrap_or(false)
     }
 
+    /// Whether Brew should upgrade formulae built from the HEAD branch
+    pub fn brew_fetch_head(&self) -> bool {
+        self.config_file
+            .brew
+            .as_ref()
+            .and_then(|c| c.fetch_head)
+            .unwrap_or(false)
+    }
+
     /// Whether Composer should update itself
     pub fn composer_self_update(&self) -> bool {
         self.config_file
diff --git a/src/steps/os/unix.rs b/src/steps/os/unix.rs
index 5ef78637..af3cf197 100644
--- a/src/steps/os/unix.rs
+++ b/src/steps/os/unix.rs
@@ -285,10 +285,15 @@ pub fn run_brew_formula(ctx: &ExecutionContext, variant: BrewVariant) -> Result<
     let run_type = ctx.run_type();
 
     variant.execute(run_type).arg("update").status_checked()?;
-    variant
-        .execute(run_type)
-        .args(["upgrade", "--formula"])
-        .status_checked()?;
+
+    let mut command = variant.execute(run_type);
+    command.args(["upgrade", "--formula"]);
+
+    if ctx.config().brew_fetch_head() {
+        command.arg("--fetch-HEAD");
+    }
+
+    command.status_checked()?;
 
     if ctx.config().cleanup() {
         variant.execute(run_type).arg("cleanup").status_checked()?;