diff --git a/src/manifest.rs b/src/manifest.rs
index 826924f..ab129e3 100644
--- a/src/manifest.rs
+++ b/src/manifest.rs
@@ -33,6 +33,22 @@ impl Display for TargetKind {
     }
 }
 
+impl FromStr for TargetKind {
+    type Err = errors::TargetKindFromStr;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            #[cfg(feature = "roblox")]
+            "roblox" => Ok(Self::Roblox),
+            #[cfg(feature = "lune")]
+            "lune" => Ok(Self::Lune),
+            #[cfg(feature = "luau")]
+            "luau" => Ok(Self::Luau),
+            t => Err(errors::TargetKindFromStr::Unknown(t.to_string())),
+        }
+    }
+}
+
 impl TargetKind {
     // self is the project's target, dependency is the target of the dependency
     pub fn is_compatible_with(&self, dependency: &Self) -> bool {
@@ -304,4 +320,11 @@ pub mod errors {
         #[error("roblox target must have at least one build file")]
         NoBuildFiles,
     }
+
+    #[derive(Debug, Error)]
+    #[non_exhaustive]
+    pub enum TargetKindFromStr {
+        #[error("unknown target kind {0}")]
+        Unknown(String),
+    }
 }
diff --git a/src/source/pesde/mod.rs b/src/source/pesde/mod.rs
index c2e21c8..491411d 100644
--- a/src/source/pesde/mod.rs
+++ b/src/source/pesde/mod.rs
@@ -1,15 +1,22 @@
-use std::{collections::BTreeMap, fmt::Debug, hash::Hash, path::Path};
+use std::{
+    collections::BTreeMap,
+    fmt::{Debug, Display},
+    hash::Hash,
+    path::Path,
+    str::FromStr,
+};
 
 use gix::remote::Direction;
 use semver::Version;
 use serde::{Deserialize, Serialize};
+use serde_with::{DeserializeFromStr, SerializeDisplay};
 
 use pkg_ref::PesdePackageRef;
 use specifier::PesdeDependencySpecifier;
 
 use crate::{
     git::authenticate_conn,
-    manifest::{DependencyType, Target},
+    manifest::{DependencyType, Target, TargetKind},
     names::{PackageName, PackageNames},
     source::{hash, DependencySpecifiers, PackageSource, ResolveResult},
     Project, REQWEST_CLIENT,
@@ -315,8 +322,8 @@ impl PackageSource for PesdePackageSource {
             PackageNames::Pesde(specifier.name.clone()),
             entries
                 .into_iter()
-                .filter(|(version, _)| specifier.version.matches(version))
-                .map(|(version, entry)| {
+                .filter(|(EntryKey(version, _), _)| specifier.version.matches(version))
+                .map(|(EntryKey(version, _), entry)| {
                     (
                         version.clone(),
                         PesdePackageRef {
@@ -393,7 +400,7 @@ impl IndexConfig {
     }
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
 pub struct IndexFileEntry {
     pub target: Target,
     #[serde(default = "chrono::Utc::now")]
@@ -406,7 +413,33 @@ pub struct IndexFileEntry {
     pub dependencies: BTreeMap<String, (DependencySpecifiers, DependencyType)>,
 }
 
-pub type IndexFile = BTreeMap<Version, IndexFileEntry>;
+#[derive(
+    Debug, SerializeDisplay, DeserializeFromStr, Clone, PartialEq, Eq, Hash, PartialOrd, Ord,
+)]
+pub struct EntryKey(pub Version, pub TargetKind);
+
+impl Display for EntryKey {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{} {}", self.0, self.1)
+    }
+}
+
+impl FromStr for EntryKey {
+    type Err = errors::EntryKeyParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let Some((version, target)) = s.split_once(' ') else {
+            return Err(errors::EntryKeyParseError::Malformed(s.to_string()));
+        };
+
+        let version = version.parse()?;
+        let target = target.parse()?;
+
+        Ok(EntryKey(version, target))
+    }
+}
+
+pub type IndexFile = BTreeMap<EntryKey, IndexFileEntry>;
 
 pub mod errors {
     use std::path::PathBuf;
@@ -560,4 +593,17 @@ pub mod errors {
         #[error("error unpacking package")]
         Unpack(#[from] std::io::Error),
     }
+
+    #[derive(Debug, Error)]
+    #[non_exhaustive]
+    pub enum EntryKeyParseError {
+        #[error("malformed entry key {0}")]
+        Malformed(String),
+
+        #[error("malformed version")]
+        Version(#[from] semver::Error),
+
+        #[error("malformed target")]
+        Target(#[from] crate::manifest::errors::TargetKindFromStr),
+    }
 }