diff --git a/uniffi/Cargo.toml b/uniffi/Cargo.toml
index ecc76fe738..5240fd0eb9 100644
--- a/uniffi/Cargo.toml
+++ b/uniffi/Cargo.toml
@@ -9,12 +9,12 @@ edition = "2018"
 # Re-exported dependencies used in generated Rust scaffolding files.
 anyhow = "1"
 bytes = "0.5"
-ffi-support = "~0.4.2"
+ffi-support = "0.4.0"
 lazy_static = "1.4"
 log = "0.4"
 # Regular dependencies
-cargo_metadata = "0.11"
-paste = "1.0"
+# cargo_metadata = { git = "https://github.com/oli-obk/cargo_metadata", rev = "64ee6d1d169103ed60ae4de5ddf84da751e7d841" }
+paste = "0.1"
 uniffi_bindgen = { path = "../uniffi_bindgen", optional = true }
 
 [features]
diff --git a/uniffi/src/lib.rs b/uniffi/src/lib.rs
index d4f4c406de..991209fe66 100644
--- a/uniffi/src/lib.rs
+++ b/uniffi/src/lib.rs
@@ -27,7 +27,7 @@
 use anyhow::{bail, Result};
 use bytes::buf::{Buf, BufMut};
 use ffi_support::ByteBuffer;
-use paste::paste;
+use paste::*;
 use std::{collections::HashMap, convert::TryFrom, ffi::CString};
 
 // It would be nice if this module was behind a cfg(test) guard, but it
@@ -160,7 +160,7 @@ macro_rules! impl_via_ffi_for_num_primitive {
     ($($T:ty,)+) => { impl_via_ffi_for_num_primitive!($($T),+); };
     ($($T:ty),*) => {
             $(
-                paste! {
+                paste::item! {
                     unsafe impl ViaFfi for $T {
                         type FfiType = Self;
 
diff --git a/uniffi/src/testing.rs b/uniffi/src/testing.rs
index 75750f5390..c72730575d 100644
--- a/uniffi/src/testing.rs
+++ b/uniffi/src/testing.rs
@@ -10,11 +10,11 @@
 //! the `uniffi_macros` crate.
 
 use anyhow::{bail, Result};
-use cargo_metadata::Message;
+// use cargo_metadata::Message;
 use lazy_static::lazy_static;
 use std::{
     collections::HashMap,
-    path::Path,
+    path::{Path, PathBuf},
     process::{Command, Stdio},
     sync::Mutex,
 };
@@ -56,56 +56,7 @@ pub fn run_foreign_language_testcase(pkg_dir: &str, idl_file: &str, test_file: &
 /// Internally, this function does a bit of caching and concurrency management to avoid rebuilding
 /// the component for multiple testcases.
 pub fn ensure_compiled_cdylib(pkg_dir: &str) -> Result<String> {
-    // Have we already compiled this component?
-    let mut compiled_components = COMPILED_COMPONENTS.lock().unwrap();
-    if let Some(cdylib_file) = compiled_components.get(pkg_dir) {
-        return Ok(cdylib_file.to_string());
-    }
-    // Nope, looks like we'll have to compile it afresh.
-    let mut cmd = Command::new("cargo");
-    cmd.arg("build").arg("--message-format=json").arg("--lib");
-    cmd.current_dir(pkg_dir);
-    cmd.stdout(Stdio::piped());
-    let mut child = cmd.spawn()?;
-    let output = std::io::BufReader::new(child.stdout.take().unwrap());
-    // Build the crate, looking for any cdylibs that it might produce.
-    let cdylibs = Message::parse_stream(output)
-        .filter_map(|message| match message {
-            Err(e) => Some(Err(e.into())),
-            Ok(Message::CompilerArtifact(artifact)) => {
-                if artifact.target.kind.iter().any(|item| item == "cdylib") {
-                    Some(Ok(artifact))
-                } else {
-                    None
-                }
-            }
-            _ => None,
-        })
-        .collect::<Result<Vec<_>>>()?;
-    if !child.wait()?.success() {
-        bail!("Failed to execute `cargo build`");
-    }
-    // If we didn't just build exactly one cdylib, we're going to have a bad time.
-    match cdylibs.len() {
-        0 => bail!("Crate did not produce any cdylibs, it must not be a uniffi component"),
-        1 => (),
-        _ => bail!("Crate produced multiple cdylibs, it must not be a uniffi component"),
-    }
-    let cdylib_files: Vec<_> = cdylibs[0]
-        .filenames
-        .iter()
-        .filter(|nm| match nm.extension().unwrap_or_default().to_str() {
-            Some("dylib") | Some("so") => true,
-            _ => false,
-        })
-        .collect();
-    if cdylib_files.len() != 1 {
-        bail!("Failed to build exactly one cdylib file, it must not be a uniffi component");
-    }
-    let cdylib_file = cdylib_files[0].to_string_lossy().into_owned();
-    // Cache the result for subsequent tests.
-    compiled_components.insert(pkg_dir.to_string(), cdylib_file.clone());
-    Ok(cdylib_file)
+    unimplemented!()
 }
 
 /// Execute the `uniffi-bindgen test` command.
diff --git a/uniffi_bindgen/Cargo.toml b/uniffi_bindgen/Cargo.toml
index 9b6814aaae..a6fe04c783 100644
--- a/uniffi_bindgen/Cargo.toml
+++ b/uniffi_bindgen/Cargo.toml
@@ -10,7 +10,7 @@ name = "uniffi-bindgen"
 path = "src/main.rs"
 
 [dependencies]
-cargo_metadata = "0.11"
+# cargo_metadata = { git = "https://github.com/oli-obk/cargo_metadata", rev = "64ee6d1d169103ed60ae4de5ddf84da751e7d841" }
 weedle = "0.11"
 anyhow = "1"
 askama = "0.10"
diff --git a/uniffi_bindgen/src/lib.rs b/uniffi_bindgen/src/lib.rs
index 23dd9fb5de..b09fbb4cdf 100644
--- a/uniffi_bindgen/src/lib.rs
+++ b/uniffi_bindgen/src/lib.rs
@@ -123,7 +123,7 @@ pub fn generate_component_scaffolding<P: AsRef<Path>>(
         .canonicalize()
         .map_err(|e| anyhow!("Failed to find idl file: {:?}", e))?;
     let component = parse_idl(&idl_file)?;
-    ensure_versions_compatibility(&idl_file, manifest_path_override)?;
+    // ensure_versions_compatibility(&idl_file, manifest_path_override)?;
     let mut filename = Path::new(&idl_file)
         .file_stem()
         .ok_or_else(|| anyhow!("not a file"))?
@@ -141,6 +141,7 @@ pub fn generate_component_scaffolding<P: AsRef<Path>>(
     Ok(())
 }
 
+/*
 // If the crate for which we are generating bindings for depends on
 // a `uniffi` runtime version that doesn't agree with our own version,
 // the developer of that said crate will be in a world of pain.
@@ -184,6 +185,7 @@ fn ensure_versions_compatibility(
     }
     Ok(())
 }
+*/
 
 // Generate the bindings in the target languages that call the scaffolding
 // Rust code.
diff --git a/uniffi_build/Cargo.toml b/uniffi_build/Cargo.toml
index 652d069cc9..a770f524f8 100644
--- a/uniffi_build/Cargo.toml
+++ b/uniffi_build/Cargo.toml
@@ -6,7 +6,7 @@ license = "MPL-2.0"
 edition = "2018"
 
 [dependencies]
-cargo_metadata = "0.11"
+# cargo_metadata = { git = "https://github.com/oli-obk/cargo_metadata", rev = "64ee6d1d169103ed60ae4de5ddf84da751e7d841" }
 anyhow = "1"
 uniffi_bindgen = { path = "../uniffi_bindgen", optional = true }