diff --git a/Cargo.lock b/Cargo.lock
index f195383..b014fbc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -374,7 +374,7 @@ checksum = "0b6a852b24ab71dffc585bcb46eaf7959d175cb865a7152e35b348d1b2960422"
 [[package]]
 name = "conformance-tests"
 version = "0.1.0"
-source = "git+https://github.com/fermyon/conformance-tests?branch=main#e846bcebdaaccb317e46387de4dbbc2e39a7199d"
+source = "git+https://github.com/fermyon/conformance-tests?rev=387b7f375df59e6254a7c29cf4a53507a9f46d32#387b7f375df59e6254a7c29cf4a53507a9f46d32"
 dependencies = [
  "anyhow",
  "flate2",
@@ -2604,7 +2604,7 @@ dependencies = [
 [[package]]
 name = "test-environment"
 version = "0.1.0"
-source = "git+https://github.com/fermyon/conformance-tests?branch=main#e846bcebdaaccb317e46387de4dbbc2e39a7199d"
+source = "git+https://github.com/fermyon/conformance-tests?rev=387b7f375df59e6254a7c29cf4a53507a9f46d32#387b7f375df59e6254a7c29cf4a53507a9f46d32"
 dependencies = [
  "anyhow",
  "fslock",
diff --git a/conformance-tests/Cargo.toml b/conformance-tests/Cargo.toml
index 8a95da3..a6ba1d9 100644
--- a/conformance-tests/Cargo.toml
+++ b/conformance-tests/Cargo.toml
@@ -5,8 +5,8 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0"
-conformance-tests = { git = "https://github.com/fermyon/conformance-tests", branch = "main" }
-test-environment = { git = "https://github.com/fermyon/conformance-tests", branch = "main" }
+conformance-tests = { git = "https://github.com/fermyon/conformance-tests", rev = "387b7f375df59e6254a7c29cf4a53507a9f46d32" }
+test-environment = { git = "https://github.com/fermyon/conformance-tests", rev = "387b7f375df59e6254a7c29cf4a53507a9f46d32" }
 spin-test = { path = ".." }
 wasmtime = "22.0"
 wasmtime-wasi = "22.0"
diff --git a/conformance-tests/src/main.rs b/conformance-tests/src/main.rs
index 4e0a4ea..4f4bc25 100644
--- a/conformance-tests/src/main.rs
+++ b/conformance-tests/src/main.rs
@@ -7,7 +7,7 @@ use runtime::SpinTest;
 const HTTP_PORT: u16 = 1234;
 
 fn main() -> anyhow::Result<()> {
-    conformance_tests::run_tests(run_test)
+    conformance_tests::run_tests("v0.1.0", run_test)
 }
 
 fn run_test(test: conformance_tests::Test) -> Result<(), anyhow::Error> {
diff --git a/crates/spin-test-virt/src/lib.rs b/crates/spin-test-virt/src/lib.rs
index e440162..88fadd5 100644
--- a/crates/spin-test-virt/src/lib.rs
+++ b/crates/spin-test-virt/src/lib.rs
@@ -669,7 +669,7 @@ impl variables::Guest for Component {
             let name = key.as_str().to_owned();
             let fut = resolver
                 .as_ref()
-                .map_err(|e| e.clone())?
+                .map_err(|e| variables::Error::Other(e.to_string()))?
                 .resolve(component_id.as_ref(), key);
             futures::executor::block_on(fut).map_err(|_| variables::Error::Undefined(name))
         })
@@ -678,7 +678,7 @@ impl variables::Guest for Component {
 
 thread_local! {
     /// The global variable resolver.
-    static VARIABLE_RESOLVER: LazyCell<Result<spin_expressions::ProviderResolver, variables::Error>> = LazyCell::new(|| {
+    static VARIABLE_RESOLVER: LazyCell<Result<spin_expressions::ProviderResolver, spin_expressions::Error>> = LazyCell::new(|| {
         let variables = manifest::AppManifest::get()
             .variables
             .into_iter()
@@ -689,8 +689,7 @@ thread_local! {
                 };
                 (k.to_string(), v)
             });
-        let mut resolver = spin_expressions::ProviderResolver::new(variables)
-            .map_err(|e| variables::Error::Other(e.to_string()))?;
+        let mut resolver = spin_expressions::ProviderResolver::new(variables)?;
         let component = manifest::AppManifest::get_component().expect("no component set");
         let component_id = manifest::AppManifest::get_component_id().expect("no component id set");
         resolver
@@ -700,8 +699,7 @@ thread_local! {
                     .variables
                     .into_iter()
                     .map(|(k, v)| (k.to_string(), v)),
-            )
-            .unwrap();
+            )?;
         resolver.add_provider(Box::new(UserGivenProvider));
         Ok(resolver)
 
diff --git a/crates/spin-test-virt/src/manifest.rs b/crates/spin-test-virt/src/manifest.rs
index 7b9018e..3df30ea 100644
--- a/crates/spin-test-virt/src/manifest.rs
+++ b/crates/spin-test-virt/src/manifest.rs
@@ -1,16 +1,33 @@
-use std::sync::{OnceLock, RwLock};
+use std::{
+    cell::LazyCell,
+    sync::{OnceLock, RwLock},
+};
+
+use crate::VARIABLE_RESOLVER;
 
 /// The manifest for the current Spin app.
 pub struct AppManifest;
 
+thread_local! {
+    /// A fully resolved and prepared resolver from the manifest.
+    static PREPARED_RESOLVER: LazyCell<anyhow::Result<spin_expressions::PreparedResolver>> = LazyCell::new(|| {
+        VARIABLE_RESOLVER.with(|resolver| {
+            let resolver = resolver.as_ref().map_err(|e| anyhow::anyhow!("{e}"))?.prepare();
+            Ok(futures::executor::block_on(resolver)?)
+        })
+    });
+}
+
 impl AppManifest {
     /// Returns the allowed hosts configuration for the current component.
     pub fn allowed_hosts() -> anyhow::Result<spin_outbound_networking::AllowedHostsConfig> {
         let allowed_outbound_hosts = Self::get_component()
             .expect("internal error: component id not yet set")
             .normalized_allowed_outbound_hosts()?;
-        let resolver = spin_expressions::PreparedResolver::default();
-        spin_outbound_networking::AllowedHostsConfig::parse(&allowed_outbound_hosts, &resolver)
+        PREPARED_RESOLVER.with(|resolver| {
+            let resolver = resolver.as_ref().map_err(|e| anyhow::anyhow!("{e}"))?;
+            spin_outbound_networking::AllowedHostsConfig::parse(&allowed_outbound_hosts, resolver)
+        })
     }
 
     /// Returns whether the given URL is allowed by the manifest.