diff --git a/src/lib.rs b/src/lib.rs
index a2da8b909..8ddebb38d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,8 +7,6 @@
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 pub mod config;
-mod diff;
 pub mod error;
 pub mod ops;
-pub mod shell;
 pub mod steps;
diff --git a/src/ops/cargo.rs b/src/ops/cargo.rs
index c9e8b3568..64b6c14b8 100644
--- a/src/ops/cargo.rs
+++ b/src/ops/cargo.rs
@@ -180,8 +180,12 @@ pub fn set_workspace_version(
 
     if dry_run {
         if manifest != original_manifest {
-            let diff =
-                crate::diff::unified_diff(&original_manifest, &manifest, manifest_path, "updated");
+            let diff = crate::ops::diff::unified_diff(
+                &original_manifest,
+                &manifest,
+                manifest_path,
+                "updated",
+            );
             log::debug!("change:\n{diff}");
         }
     } else {
@@ -278,8 +282,12 @@ pub fn set_package_version(manifest_path: &Path, version: &str, dry_run: bool) -
 
     if dry_run {
         if manifest != original_manifest {
-            let diff =
-                crate::diff::unified_diff(&original_manifest, &manifest, manifest_path, "updated");
+            let diff = crate::ops::diff::unified_diff(
+                &original_manifest,
+                &manifest,
+                manifest_path,
+                "updated",
+            );
             log::debug!("change:\n{diff}");
         }
     } else {
@@ -314,8 +322,12 @@ pub fn upgrade_dependency_req(
     let manifest = manifest.to_string();
     if manifest != original_manifest {
         if dry_run {
-            let diff =
-                crate::diff::unified_diff(&original_manifest, &manifest, manifest_path, "updated");
+            let diff = crate::ops::diff::unified_diff(
+                &original_manifest,
+                &manifest,
+                manifest_path,
+                "updated",
+            );
             log::debug!("change:\n{diff}");
         } else {
             atomic_write(manifest_path, &manifest)?;
diff --git a/src/diff.rs b/src/ops/diff.rs
similarity index 100%
rename from src/diff.rs
rename to src/ops/diff.rs
diff --git a/src/ops/mod.rs b/src/ops/mod.rs
index d7b9c7469..07628b0e0 100644
--- a/src/ops/mod.rs
+++ b/src/ops/mod.rs
@@ -5,3 +5,5 @@ pub mod index;
 pub mod replace;
 pub mod shell;
 pub mod version;
+
+pub(crate) mod diff;
diff --git a/src/ops/replace.rs b/src/ops/replace.rs
index ec0209ca1..635dfa34f 100644
--- a/src/ops/replace.rs
+++ b/src/ops/replace.rs
@@ -124,7 +124,7 @@ pub fn do_file_replacements(
                         format!(
                             "in {}\n{}",
                             path.display(),
-                            crate::diff::unified_diff(&data, &replaced, &path, "replaced")
+                            crate::ops::diff::unified_diff(&data, &replaced, &path, "replaced")
                         ),
                     );
                 } else {
diff --git a/src/shell.rs b/src/shell.rs
deleted file mode 100644
index 978f63aab..000000000
--- a/src/shell.rs
+++ /dev/null
@@ -1,72 +0,0 @@
-use std::io::Write;
-
-use anyhow::Context as _;
-pub use termcolor::{Color, ColorChoice};
-use termcolor::{ColorSpec, StandardStream, WriteColor};
-
-use crate::error::CargoResult;
-
-/// Whether to color logged output
-fn colorize_stderr() -> ColorChoice {
-    if concolor_control::get(concolor_control::Stream::Stderr).color() {
-        ColorChoice::Always
-    } else {
-        ColorChoice::Never
-    }
-}
-
-/// Print a message with a colored title in the style of Cargo shell messages.
-pub fn print(
-    status: &str,
-    message: impl std::fmt::Display,
-    color: Color,
-    justified: bool,
-) -> CargoResult<()> {
-    let color_choice = colorize_stderr();
-    let mut output = StandardStream::stderr(color_choice);
-
-    output.set_color(ColorSpec::new().set_fg(Some(color)).set_bold(true))?;
-    if justified {
-        write!(output, "{status:>12}")?;
-    } else {
-        write!(output, "{}", status)?;
-        output.set_color(ColorSpec::new().set_bold(true))?;
-        write!(output, ":")?;
-    }
-    output.reset()?;
-
-    writeln!(output, " {message}").with_context(|| "Failed to write message")?;
-
-    Ok(())
-}
-
-/// Print a styled action message.
-pub fn status(action: &str, message: impl std::fmt::Display) -> CargoResult<()> {
-    print(action, message, Color::Green, true)
-}
-
-/// Print a styled error message.
-pub fn error(message: impl std::fmt::Display) -> CargoResult<()> {
-    print("error", message, Color::Red, false)
-}
-
-/// Print a styled warning message.
-pub fn warn(message: impl std::fmt::Display) -> CargoResult<()> {
-    print("warning", message, Color::Yellow, false)
-}
-
-/// Print a styled warning message.
-pub fn note(message: impl std::fmt::Display) -> CargoResult<()> {
-    print("note", message, Color::Cyan, false)
-}
-
-/// Print a part of a line with formatting
-pub fn write_stderr(fragment: impl std::fmt::Display, spec: &ColorSpec) -> CargoResult<()> {
-    let color_choice = colorize_stderr();
-    let mut output = StandardStream::stderr(color_choice);
-
-    output.set_color(spec)?;
-    write!(output, "{}", fragment)?;
-    output.reset()?;
-    Ok(())
-}
diff --git a/src/steps/commit.rs b/src/steps/commit.rs
index 1c25d0d66..09ee0e799 100644
--- a/src/steps/commit.rs
+++ b/src/steps/commit.rs
@@ -93,7 +93,7 @@ impl CommitStep {
         if ws_config.is_workspace {
             let consolidate_commits = super::consolidate_commits(&selected_pkgs, &excluded_pkgs)?;
             if !consolidate_commits {
-                let _ = crate::shell::warn(
+                let _ = crate::ops::shell::warn(
                     "ignoring `consolidate-commits=false`; `cargo release commit` can effectively only do one commit",
                 );
             }