diff --git a/Cargo.lock b/Cargo.lock
index afe9e33..b4a29a7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -989,9 +989,9 @@ checksum = "7a66a03ae7c801facd77a29370b4faec201768915ac14a721ba36f20bc9c209b"
 
 [[package]]
 name = "registry-conformance"
-version = "0.5.1"
+version = "0.5.2"
 source = "sparse+https://integer32llc.github.io/registry-conformance/"
-checksum = "e7832c5e5390f7d9546f65df6b36758bd755c82310c43255a741e8bd9524101c"
+checksum = "7bf0349976913b09e95602e5dcab7f99a6792c389404e972582a6bf387656b7a"
 dependencies = [
  "base64",
  "futures",
diff --git a/Cargo.toml b/Cargo.toml
index 23eef7a..6794546 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ lint_groups_priority = { level = "allow", priority = 1 } # Remove after 1.80. ht
 
 [workspace.dependencies]
 argh = { version = "0.1.12", default-features = false }
-registry-conformance = { version = "0.5.0", registry = "registry-conformance" }
+registry-conformance = { version = "0.5.2", registry = "registry-conformance" }
 snafu = { version = "0.8.2", default-features = false, features = ["rust_1_65", "std"] }
 tokio = { version = "1.37.0", default-features = false, features = ["macros", "process", "rt-multi-thread"] }
 
diff --git a/src/main.rs b/src/main.rs
index f5924c1..9d486e1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1014,9 +1014,33 @@ enum ExtractRootCargoTomlError {
 fn adapt_cargo_toml_to_index_entry(
     global: &Global,
     config: &ConfigV1,
-    cargo_toml: cargo_toml::Root,
+    mut cargo_toml: cargo_toml::Root,
     checksum_hex: String,
 ) -> index_entry::Root {
+    // Remove features that refer to dev-dependencies as we don't
+    // track those anyway.
+    {
+        // Ignore dependencies that also occur as a regular or build
+        // dependency, as we *do* track those.
+        let reg_dep_names = cargo_toml.dependencies.keys();
+        let build_dep_names = cargo_toml.build_dependencies.keys();
+        let mut only_dev_dep_names = cargo_toml.dev_dependencies.keys().collect::<BTreeSet<_>>();
+        for name in reg_dep_names.chain(build_dep_names) {
+            only_dev_dep_names.remove(name);
+        }
+
+        for name in only_dev_dep_names {
+            // We don't care about the official package name here as the
+            // feature syntax has to match the user-specified dependency
+            // name.
+            let prefix = format!("{name}/");
+
+            for enabled in cargo_toml.features.values_mut() {
+                enabled.retain(|enable| !enable.starts_with(&prefix));
+            }
+        }
+    }
+
     let mut deps: Vec<_> = cargo_toml
         .dependencies
         .into_iter()
@@ -1126,6 +1150,9 @@ mod cargo_toml {
         #[serde(default)]
         pub build_dependencies: Dependencies,
 
+        #[serde(default)]
+        pub dev_dependencies: Dependencies,
+
         #[serde(default)]
         pub target: BTreeMap<String, Target>,
     }