diff --git a/src/config/built_in.rs b/src/config/built_in.rs
index fa07718..8d9a5a8 100644
--- a/src/config/built_in.rs
+++ b/src/config/built_in.rs
@@ -10,14 +10,17 @@ pub(crate) fn get_built_ins() -> BTreeMap<ApiName, ApiConfig> {
         perm(
             &[
                 "std::fs",
+                // Darwin is not yet supported
+                //"std::os::darwin::fs",
                 "std::os::linux::fs",
                 "std::os::unix::fs",
                 "std::os::unix::io",
-                "std::os::wasi::fs",
-                "std::os::wasi::io",
-                "std::os::windows::fs",
-                "std::os::windows::io",
-                "std::path",
+                // WASI is not yet supported
+                //"std::os::wasi::fs",
+                //"std::os::wasi::io",
+                // Windows is not yet supported
+                //"std::os::windows::fs",
+                //"std::os::windows::io",
             ],
             &[],
         ),
@@ -26,7 +29,12 @@ pub(crate) fn get_built_ins() -> BTreeMap<ApiName, ApiConfig> {
     result.insert(
         ApiName::from("net"),
         perm(
-            &["std::net", "std::os::wasi::net", "std::os::windows::net"],
+            &[
+                "std::net",
+                "std::os::linux::net",
+                // Windows is not yet supported
+                //"std::os::windows::net",
+            ],
             &[],
         ),
     );
@@ -39,8 +47,10 @@ pub(crate) fn get_built_ins() -> BTreeMap<ApiName, ApiConfig> {
         perm(
             &[
                 "std::process",
+                "std::os::linux::process",
                 "std::unix::process",
-                "std::windows::process",
+                // Windows is not yet supported
+                //"std::windows::process",
             ],
             &["std::process::abort", "std::process::exit"],
         ),
diff --git a/test_crates/cackle.toml b/test_crates/cackle.toml
index ee9c435..7b4bd10 100644
--- a/test_crates/cackle.toml
+++ b/test_crates/cackle.toml
@@ -153,7 +153,6 @@ test.allow_apis = [
 allow_unsafe = true
 build.allow_apis = [
     "env",
-    "fs",
     "process",
 ]
 allow_build_instructions = [
diff --git a/test_crates/crab-4/src/lib.rs b/test_crates/crab-4/src/lib.rs
index 42b86f7..89dc113 100644
--- a/test_crates/crab-4/src/lib.rs
+++ b/test_crates/crab-4/src/lib.rs
@@ -2,7 +2,7 @@
 //! results from this crate in parallel to crab_1, since neither depends on the other.
 
 use std::ffi::OsString;
-use std::path::Path;
+use std::fs;
 
 pub fn access_file() {
     f1();
@@ -15,19 +15,19 @@ pub fn access_file() {
 }
 
 fn f1() {
-    let _ = Path::new("a.txt").exists();
+    let _ = fs::exists("a.txt");
 }
 
 fn f2() {
-    let _ = Path::new("a.txt").exists();
+    let _ = fs::exists("a.txt");
 }
 
 fn f3() {
-    let _ = Path::new("a.txt").exists();
+    let _ = fs::exists("a.txt");
 }
 
 fn f4() {
-    let _ = Path::new("a.txt").exists();
+    let _ = fs::exists("a.txt");
 }
 
 /// Make sure that we can't circumvent checks by accessing a function via a function pointer instead
diff --git a/test_crates/crab-5/src/lib.rs b/test_crates/crab-5/src/lib.rs
index 42b068f..0d86a18 100644
--- a/test_crates/crab-5/src/lib.rs
+++ b/test_crates/crab-5/src/lib.rs
@@ -2,7 +2,7 @@
 //! problems encountered while checking this crate might show up twice, since the two build.rs files
 //! can be checked in parallel.
 
-use std::path::Path;
+use std::fs;
 use std::sync::atomic::AtomicU8;
 
 pub fn do_something() -> bool {
@@ -10,7 +10,7 @@ pub fn do_something() -> bool {
 }
 
 fn helper() -> bool {
-    let c = || Path::new("/").exists();
+    let c = || fs::exists("/").is_ok();
     c()
 }
 
diff --git a/test_crates/crab-7/src/lib.rs b/test_crates/crab-7/src/lib.rs
index f824f28..97b7153 100644
--- a/test_crates/crab-7/src/lib.rs
+++ b/test_crates/crab-7/src/lib.rs
@@ -1,4 +1,4 @@
-use std::path::Path;
+use std::fs;
 
 pub fn do_something() {}
 
@@ -8,7 +8,7 @@ extern "C" fn before_main() {
     // pre-main activities and with recent versions doing so causes an assertion failure. We can
     // apparently still get away with the environment variable check.
     if std::env::var("FOO").is_ok() {
-        println!("Does / exist?: {:?}", Path::new("/").exists());
+        println!("Does / exist?: {:?}", fs::exists("/").is_ok_and(|exists| exists));
     }
 }
 
diff --git a/test_crates/crab-8/src/lib.rs b/test_crates/crab-8/src/lib.rs
index a7c9170..52126ae 100644
--- a/test_crates/crab-8/src/lib.rs
+++ b/test_crates/crab-8/src/lib.rs
@@ -1,5 +1,5 @@
 pub fn print_defaults() {
     // Instantiate cra6::print_default with a PathBuf. This shouldn't count as crab_6 using the fs
     // API, but it should count as this crate using it.
-    crab_6::print_default::<std::path::PathBuf>();
+    crab_6::print_default::<std::sync::LazyLock<std::fs::FileTimes>>();
 }