diff --git a/Cargo.lock b/Cargo.lock
index a2b97ad28..71a71b8ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2753,6 +2753,7 @@ dependencies = [
  "generate-emscripten-tests",
  "generate-wasi-tests",
  "glob 0.3.0",
+ "libc",
  "log",
  "rustc_version",
  "serde",
@@ -2761,7 +2762,6 @@ dependencies = [
  "wabt",
  "wasmer",
  "wasmer-clif-backend",
- "wasmer-dev-utils",
  "wasmer-emscripten",
  "wasmer-kernel-loader",
  "wasmer-llvm-backend",
@@ -2824,13 +2824,6 @@ dependencies = [
  "wasmparser",
 ]
 
-[[package]]
-name = "wasmer-dev-utils"
-version = "0.16.2"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "wasmer-emscripten"
 version = "0.16.2"
diff --git a/Cargo.toml b/Cargo.toml
index 501485164..310138723 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,7 +37,6 @@ wasmer-emscripten = { path = "lib/emscripten" }
 wasmer-llvm-backend = { path = "lib/llvm-backend", optional = true }
 wasmer-wasi = { path = "lib/wasi", optional = true }
 wasmer-kernel-loader = { path = "lib/kernel-loader", optional = true }
-wasmer-dev-utils = { path = "lib/dev-utils", optional = true }
 wasmer-wasi-experimental-io-devices = { path = "lib/wasi-experimental-io-devices", optional = true }
 
 [workspace]
@@ -55,7 +54,6 @@ members = [
     "lib/middleware-common",
     "lib/kernel-loader",
     "lib/kernel-net",
-    "lib/dev-utils",
     "lib/wasi-experimental-io-devices",
     "lib/interface-types",
     "examples/parallel",
@@ -75,10 +73,10 @@ rustc_version = "0.2"
 [dev-dependencies]
 criterion = "0.3"
 glob = "0.3"
+libc = "0.2.60" # for `tests/dev-utils`'s Stdout capturing
 serde = { version = "1", features = ["derive"] } # used by the plugin example
 typetag = "0.1" # used by the plugin example
 wabt = "0.9.1"
-wasmer-dev-utils = { path = "lib/dev-utils" }
 
 [features]
 default = ["fast-tests", "wasi", "backend-cranelift", "wabt"]
diff --git a/Makefile b/Makefile
index 70c77e40a..a357cdf50 100644
--- a/Makefile
+++ b/Makefile
@@ -156,7 +156,6 @@ test-capi: test-capi-singlepass test-capi-cranelift test-capi-llvm test-capi-ems
 capi-test: test-capi
 
 test-rest:
-	cargo test --release -p wasmer-dev-utils
 	cargo test --release -p wasmer-interface-types
 	cargo test --release -p wasmer-kernel-loader
 	cargo test --release -p kernel-net
@@ -210,7 +209,7 @@ check-bench: check-bench-singlepass check-bench-llvm
 
 # TODO: We wanted `--workspace --exclude wasmer-runtime`, but can't due
 # to https://github.com/rust-lang/cargo/issues/6745 .
-NOT_RUNTIME_CRATES = -p wasmer-clif-backend -p wasmer-singlepass-backend -p wasmer-middleware-common -p wasmer-runtime-core -p wasmer-emscripten -p wasmer-llvm-backend -p wasmer-wasi -p wasmer-kernel-loader -p wasmer-dev-utils -p wasmer-interface-types
+NOT_RUNTIME_CRATES = -p wasmer-clif-backend -p wasmer-singlepass-backend -p wasmer-middleware-common -p wasmer-runtime-core -p wasmer-emscripten -p wasmer-llvm-backend -p wasmer-wasi -p wasmer-kernel-loader -p wasmer-interface-types
 RUNTIME_CHECK = cargo check --manifest-path lib/runtime/Cargo.toml --no-default-features
 check: check-bench
 	cargo check $(NOT_RUNTIME_CRATES)
@@ -348,7 +347,7 @@ publish-release:
 # cargo install cargo-deps
 # must install graphviz for `dot`
 dep-graph:
-	cargo deps --optional-deps --filter wasmer-wasi wasmer-kernel-loader wasmer-dev-utils wasmer-llvm-backend wasmer-emscripten wasmer-runtime-core wasmer-runtime wasmer-middleware-common wasmer-singlepass-backend wasmer-clif-backend wasmer --manifest-path Cargo.toml | dot -Tpng > wasmer_depgraph.png
+	cargo deps --optional-deps --filter wasmer-wasi wasmer-kernel-loader wasmer-llvm-backend wasmer-emscripten wasmer-runtime-core wasmer-runtime wasmer-middleware-common wasmer-singlepass-backend wasmer-clif-backend wasmer --manifest-path Cargo.toml | dot -Tpng > wasmer_depgraph.png
 
 docs-capi:
 	cd lib/runtime-c-api/ && doxygen doxyfile
diff --git a/lib/dev-utils/Cargo.toml b/lib/dev-utils/Cargo.toml
deleted file mode 100644
index 07800ed61..000000000
--- a/lib/dev-utils/Cargo.toml
+++ /dev/null
@@ -1,12 +0,0 @@
-[package]
-name = "wasmer-dev-utils"
-version = "0.16.2"
-description = "Wasmer runtime core library"
-license = "MIT"
-authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
-edition = "2018"
-repository = "https://github.com/wasmerio/wasmer"
-publish = false
-
-[dependencies]
-libc = "0.2.60"
diff --git a/lib/dev-utils/README.md b/lib/dev-utils/README.md
deleted file mode 100644
index d198eaa70..000000000
--- a/lib/dev-utils/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Dev Utils
-
-This is shared code between the modules for testing and development only.  Code in this crate will not be shipped.
diff --git a/lib/dev-utils/src/lib.rs b/lib/dev-utils/src/lib.rs
deleted file mode 100644
index 2a470bba4..000000000
--- a/lib/dev-utils/src/lib.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-#![doc(html_favicon_url = "https://wasmer.io/static/icons/favicon.ico")]
-#![doc(html_logo_url = "https://avatars3.githubusercontent.com/u/44205449?s=200&v=4")]
-
-pub mod file_descriptor;
-pub mod stdio;
diff --git a/src/commands/run.rs b/src/commands/run.rs
index cab0d6fa8..cc851e743 100644
--- a/src/commands/run.rs
+++ b/src/commands/run.rs
@@ -1,9 +1,11 @@
 use crate::common::{get_cache_dir, PrestandardFeatures};
 use crate::utils::read_file_contents;
 use std::collections::HashMap;
-use std::fs::read_to_string;
-use std::fs::File;
-use std::io::{Read, Write};
+use std::fs;
+#[cfg(feature = "managed")]
+use std::io::Read;
+#[cfg(any(feature = "backend-llvm", feature = "managed"))]
+use std::io::Write;
 use std::path::PathBuf;
 use std::process::exit;
 use std::str::FromStr;
@@ -363,7 +365,7 @@ fn execute_wasi(
                 module.info(),
                 &_wasm_binary,
                 if let Some(ref path) = options.resume {
-                    let mut f = File::open(path).unwrap();
+                    let mut f = fs::File::open(path).unwrap();
                     let mut out: Vec<u8> = vec![];
                     f.read_to_end(&mut out).unwrap();
                     wasmer_runtime_core::state::InstanceImage::from_bytes(&out)
@@ -461,7 +463,7 @@ impl LLVMCallbacks for LLVMCLIOptions {
     fn obj_memory_buffer_callback(&mut self, memory_buffer: &InkwellMemoryBuffer) {
         if let Some(filename) = &self.obj_file {
             let mem_buf_slice = memory_buffer.as_slice();
-            let mut file = File::create(filename).unwrap();
+            let mut file = fs::File::create(filename).unwrap();
             let mut pos = 0;
             while pos < mem_buf_slice.len() {
                 pos += file.write(&mem_buf_slice[pos..]).unwrap();
@@ -493,7 +495,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
     })?;
 
     let em_symbol_map = if let Some(em_symbol_map_path) = options.em_symbol_map.clone() {
-        let em_symbol_map_content: String = read_to_string(&em_symbol_map_path)
+        let em_symbol_map_content: String = fs::read_to_string(&em_symbol_map_path)
             .map_err(|err| {
                 format!(
                     "Can't read symbol map file {}: {}",
@@ -860,7 +862,7 @@ fn interactive_shell(mut ctx: InteractiveShellContext) -> ShellExitOperation {
 
                 if let Some(ref image) = ctx.image {
                     let buf = image.to_bytes();
-                    let mut f = match File::create(path) {
+                    let mut f = match fs::File::create(path) {
                         Ok(x) => x,
                         Err(e) => {
                             println!("Cannot open output file at {}: {:?}", path, e);
diff --git a/lib/dev-utils/src/file_descriptor.rs b/tests/dev_utils/file_descriptor.rs
similarity index 100%
rename from lib/dev-utils/src/file_descriptor.rs
rename to tests/dev_utils/file_descriptor.rs
diff --git a/tests/dev_utils/mod.rs b/tests/dev_utils/mod.rs
new file mode 100644
index 000000000..76ae6804f
--- /dev/null
+++ b/tests/dev_utils/mod.rs
@@ -0,0 +1,2 @@
+pub mod file_descriptor;
+pub mod stdio;
diff --git a/lib/dev-utils/src/stdio.rs b/tests/dev_utils/stdio.rs
similarity index 100%
rename from lib/dev-utils/src/stdio.rs
rename to tests/dev_utils/stdio.rs
diff --git a/tests/emtest.rs b/tests/emtest.rs
index d8a255bce..ae941d3c8 100644
--- a/tests/emtest.rs
+++ b/tests/emtest.rs
@@ -1 +1,2 @@
+pub mod dev_utils;
 mod emtests;
diff --git a/tests/emtests/_common.rs b/tests/emtests/_common.rs
index 236e264c6..8808e704a 100644
--- a/tests/emtests/_common.rs
+++ b/tests/emtests/_common.rs
@@ -37,7 +37,7 @@ macro_rules! assert_emscripten_output {
             EmscriptenGlobals,
             generate_emscripten_env,
         };
-        use wasmer_dev_utils::stdio::StdioCapturer;
+        use crate::dev_utils::stdio::StdioCapturer;
 
         let wasm_bytes = include_bytes!($file);
         let backend = $crate::emtests::_common::get_backend().expect("Please set one of `WASMER_TEST_CRANELIFT`, `WASMER_TEST_LLVM`, or `WASMER_TEST_SINGELPASS` to `1`.");
diff --git a/tests/wasitest.rs b/tests/wasitest.rs
index a89a8f1a3..dd8af3824 100644
--- a/tests/wasitest.rs
+++ b/tests/wasitest.rs
@@ -1 +1,2 @@
+pub mod dev_utils;
 mod wasitests;
diff --git a/tests/wasitests/_common.rs b/tests/wasitests/_common.rs
index a747f18ee..6cc303332 100644
--- a/tests/wasitests/_common.rs
+++ b/tests/wasitests/_common.rs
@@ -32,7 +32,7 @@ pub fn get_backend() -> Option<Backend> {
 
 macro_rules! assert_wasi_output {
     ($file:expr, $name:expr, $po_dir_args: expr, $mapdir_args:expr, $envvar_args:expr, $expected:expr) => {{
-        use wasmer_dev_utils::stdio::StdioCapturer;
+        use crate::dev_utils::stdio::StdioCapturer;
         use wasmer_runtime::Func;
         use wasmer_wasi::{generate_import_object_for_version, get_wasi_version};