diff --git a/lix/legacy/nix-build.cc b/lix/legacy/nix-build.cc
index 9f3d5b02c..dcf4e811f 100644
--- a/lix/legacy/nix-build.cc
+++ b/lix/legacy/nix-build.cc
@@ -405,12 +405,6 @@ static void main_nix_build(AsyncIoRoot & aio, std::string programName, Strings a
             shell = store->printStorePath(shellDrvOutputs.at("out").value()) + "/bin/bash";
         }
 
-        if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
-            auto resolvedDrv = aio.blockOn(drv.tryResolve(*store));
-            assert(resolvedDrv && "Successfully resolved the derivation");
-            drv = *resolvedDrv;
-        }
-
         // Set the environment.
         auto env = getEnv();
 
diff --git a/lix/nix/app.cc b/lix/nix/app.cc
index 4acb49675..1aaf4997f 100644
--- a/lix/nix/app.cc
+++ b/lix/nix/app.cc
@@ -11,46 +11,6 @@
 
 namespace nix {
 
-/**
- * Return the rewrites that are needed to resolve a string whose context is
- * included in `dependencies`.
- */
-StringPairs resolveRewrites(
-    Store & store,
-    const std::vector<BuiltPathWithResult> & dependencies)
-{
-    StringPairs res;
-    if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
-        for (auto & dep : dependencies) {
-            if (auto drvDep = std::get_if<BuiltPathBuilt>(&dep.path)) {
-                for (auto & [ outputName, outputPath ] : drvDep->outputs) {
-                    res.emplace(
-                        DownstreamPlaceholder::fromSingleDerivedPathBuilt(
-                            SingleDerivedPath::Built {
-                                .drvPath = makeConstantStorePath(drvDep->drvPath.path),
-                                .output = outputName,
-                            }).render(),
-                        store.printStorePath(outputPath)
-                    );
-                }
-            }
-        }
-    }
-    return res;
-}
-
-/**
- * Resolve the given string assuming the given context.
- */
-std::string resolveString(
-    Store & store,
-    const std::string & toResolve,
-    const std::vector<BuiltPathWithResult> & dependencies)
-{
-    auto rewrites = resolveRewrites(store, dependencies);
-    return rewriteStrings(toResolve, rewrites);
-}
-
 UnresolvedApp InstallableValue::toApp(EvalState & state)
 {
     auto cursor = getCursor(state);
@@ -136,8 +96,7 @@ App UnresolvedApp::resolve(EvalState & state, ref<Store> evalStore, ref<Store> s
         installableContext.push_back(
             make_ref<InstallableDerivedPath>(store, DerivedPath { ctxElt }));
 
-    auto builtContext = Installable::build(state, evalStore, store, Realise::Outputs, installableContext);
-    res.program = resolveString(*store, unresolved.program, builtContext);
+    Installable::build(state, evalStore, store, Realise::Outputs, installableContext);
     if (!store->isInStore(res.program))
         throw Error("app program '%s' is not in the Nix store", res.program);
 
diff --git a/lix/nix/develop.cc b/lix/nix/develop.cc
index bb107d51c..90a14ba47 100644
--- a/lix/nix/develop.cc
+++ b/lix/nix/develop.cc
@@ -235,26 +235,19 @@ try {
     drv.name += "-env";
     drv.env.emplace("name", drv.name);
     drv.inputSrcs.insert(std::move(getEnvShPath));
-    if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
-        for (auto & output : drv.outputs) {
-            output.second = DerivationOutput::Deferred {},
-            drv.env[output.first] = hashPlaceholder(output.first);
-        }
-    } else {
-        for (auto & output : drv.outputs) {
-            output.second = DerivationOutput::Deferred { };
-            drv.env[output.first] = "";
-        }
-        auto hashesModulo = TRY_AWAIT(hashDerivationModulo(*evalStore, drv, true));
+    for (auto & output : drv.outputs) {
+        output.second = DerivationOutput::Deferred { };
+        drv.env[output.first] = "";
+    }
+    auto hashesModulo = TRY_AWAIT(hashDerivationModulo(*evalStore, drv, true));
 
-        for (auto & output : drv.outputs) {
-            Hash h = hashesModulo.hashes.at(output.first);
-            auto outPath = store->makeOutputPath(output.first, h, drv.name);
-            output.second = DerivationOutput::InputAddressed {
-                .path = outPath,
-            };
-            drv.env[output.first] = store->printStorePath(outPath);
-        }
+    for (auto & output : drv.outputs) {
+        Hash h = hashesModulo.hashes.at(output.first);
+        auto outPath = store->makeOutputPath(output.first, h, drv.name);
+        output.second = DerivationOutput::InputAddressed {
+            .path = outPath,
+        };
+        drv.env[output.first] = store->printStorePath(outPath);
     }
 
     auto shellDrvPath = TRY_AWAIT(writeDerivation(*evalStore, drv));
diff --git a/lix/nix/realisation.cc b/lix/nix/realisation.cc
index 164b5e6c6..8151b7860 100644
--- a/lix/nix/realisation.cc
+++ b/lix/nix/realisation.cc
@@ -45,37 +45,7 @@ struct CmdRealisationInfo : BuiltPathsCommand, MixJSON
 
     void run(ref<Store> store, BuiltPaths && paths) override
     {
-        experimentalFeatureSettings.require(Xp::CaDerivations);
-        RealisedPath::Set realisations;
-
-        for (auto & builtPath : paths) {
-            auto theseRealisations = aio().blockOn(builtPath.toRealisedPaths(*store));
-            realisations.insert(theseRealisations.begin(), theseRealisations.end());
-        }
-
-        if (json) {
-            JSON res = JSON::array();
-            for (auto & path : realisations) {
-                JSON currentPath;
-                if (auto realisation = std::get_if<Realisation>(&path.raw))
-                    currentPath = realisation->toJSON();
-                else
-                    currentPath["opaquePath"] = store->printStorePath(path.path());
-
-                res.push_back(currentPath);
-            }
-            logger->cout("%s", res);
-        }
-        else {
-            for (auto & path : realisations) {
-                if (auto realisation = std::get_if<Realisation>(&path.raw)) {
-                    logger->cout("%s %s",
-                        realisation->id.to_string(),
-                        store->printStorePath(realisation->outPath));
-                } else
-                    logger->cout("%s", store->printStorePath(path.path()));
-            }
-        }
+        throw UnimplementedError("CA derivations are no longer supported");
     }
 };
 
diff --git a/subprojects/nix-eval-jobs/src/drv.cc b/subprojects/nix-eval-jobs/src/drv.cc
index 2d39c14a7..8821ee976 100644
--- a/subprojects/nix-eval-jobs/src/drv.cc
+++ b/subprojects/nix-eval-jobs/src/drv.cc
@@ -50,19 +50,10 @@ Drv::Drv(std::string &attrPath, nix::EvalState &state, nix::DrvInfo &drvInfo,
     auto localStore = state.ctx.store.try_cast_shared<nix::LocalFSStore>();
 
     try {
-        // CA derivations do not have static output paths, so we have to
-        // defensively not query output paths in case we encounter one.
         for (auto &[outputName, optOutputPath] :
-             drvInfo.queryOutputs(state, !nix::experimentalFeatureSettings.isEnabled(
-                 nix::Xp::CaDerivations))) {
-            if (optOutputPath) {
-                outputs[outputName] =
-                    localStore->printStorePath(*optOutputPath);
-            } else {
-                assert(nix::experimentalFeatureSettings.isEnabled(
-                    nix::Xp::CaDerivations));
-                outputs[outputName] = std::nullopt;
-            }
+             drvInfo.queryOutputs(state, true)) {
+            assert(optOutputPath);
+            outputs[outputName] = localStore->printStorePath(*optOutputPath);
         }
     } catch (const std::exception &e) { // NOLINT(lix-foreign-exceptions)
         state.ctx.errors.make<nix::EvalError>(