diff --git a/Cargo.lock b/Cargo.lock
index c9e263ab..746a5a24 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2145,6 +2145,7 @@ dependencies = [
  "octocrab",
  "rocks-lib",
  "rustyline",
+ "serde_json",
  "spdx",
  "spinners",
  "termcolor",
diff --git a/rocks-bin/Cargo.toml b/rocks-bin/Cargo.toml
index ac56d63c..feba0394 100644
--- a/rocks-bin/Cargo.toml
+++ b/rocks-bin/Cargo.toml
@@ -12,6 +12,7 @@ itertools = "0.12.1"
 nucleo = "0.4.1"
 octocrab = "0.36.0"
 rustyline = "14.0.0"
+serde_json = "1.0.118"
 spdx = "0.10.4"
 spinners = "4.1.1"
 termcolor = "1.4.1"
diff --git a/rocks-bin/src/list.rs b/rocks-bin/src/list.rs
index 8f09c2d6..72b4c801 100644
--- a/rocks-bin/src/list.rs
+++ b/rocks-bin/src/list.rs
@@ -25,9 +25,7 @@ pub fn list(list_data: List, config: &Config) -> Result<()> {
     // TODO(vhyrro): Add `outdated` support.
 
     if list_data.porcelain {
-        for (name, versions) in available_rocks {
-            println!("{}: {}", name, versions.join(" "));
-        }
+        println!("{}", serde_json::to_string(&available_rocks)?);
     } else {
         let formatting = TreeFormatting::dir_tree(FormatCharacters::box_chars());
         for (name, versions) in available_rocks.into_iter().sorted() {