diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce7fac5e9..37a660376 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,9 +15,11 @@ All notable changes to this project will be documented in this file.
 ### Fixed
 
 - spark-k8s: reduce docker image size by removing the recursive chown/chmods in the final image ([#1042]).
+- Add `--locked` flag to `cargo install` commands for reproducible builds ([#1044]).
 
 [#1034]: https://github.com/stackabletech/docker-images/pull/1034
 [#1042]: https://github.com/stackabletech/docker-images/pull/1042
+[#1044]: https://github.com/stackabletech/docker-images/pull/1044
 
 ## [25.3.0] - 2025-03-21
 
diff --git a/stackable-base/Dockerfile b/stackable-base/Dockerfile
index 3109ef2b5..6735fd52d 100644
--- a/stackable-base/Dockerfile
+++ b/stackable-base/Dockerfile
@@ -36,7 +36,7 @@ rm -rf /var/cache/yum
 
 # WARNING (@NickLarsenNZ): We should pin the rustup version
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "$RUST_DEFAULT_TOOLCHAIN_VERSION"
-. "$HOME/.cargo/env" && cargo --quiet install cargo-cyclonedx@"$CARGO_CYCLONEDX_CRATE_VERSION" cargo-auditable@"$CARGO_AUDITABLE_CRATE_VERSION"
+. "$HOME/.cargo/env" && cargo --quiet install --locked cargo-cyclonedx@"$CARGO_CYCLONEDX_CRATE_VERSION" cargo-auditable@"$CARGO_AUDITABLE_CRATE_VERSION"
 EOF
 
 FROM product-utils-builder AS config-utils
diff --git a/ubi8-rust-builder/Dockerfile b/ubi8-rust-builder/Dockerfile
index 27541b0af..0e74506da 100644
--- a/ubi8-rust-builder/Dockerfile
+++ b/ubi8-rust-builder/Dockerfile
@@ -80,7 +80,7 @@ WORKDIR /
 RUN <<EOF
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "$RUST_DEFAULT_TOOLCHAIN_VERSION"
 . "$HOME/.cargo/env"
-cargo --quiet install "cargo-cyclonedx@$CARGO_CYCLONEDX_CRATE_VERSION" "cargo-auditable@$CARGO_AUDITABLE_CRATE_VERSION"
+cargo --quiet install --locked "cargo-cyclonedx@$CARGO_CYCLONEDX_CRATE_VERSION" "cargo-auditable@$CARGO_AUDITABLE_CRATE_VERSION"
 EOF
 
 # Build artifacts will be available in /app.
diff --git a/ubi9-rust-builder/Dockerfile b/ubi9-rust-builder/Dockerfile
index b4f8ca6e7..5e545411e 100644
--- a/ubi9-rust-builder/Dockerfile
+++ b/ubi9-rust-builder/Dockerfile
@@ -79,7 +79,7 @@ WORKDIR /
 RUN <<EOF
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "$RUST_DEFAULT_TOOLCHAIN_VERSION"
 . "$HOME/.cargo/env"
-cargo install --quiet "cargo-cyclonedx@$CARGO_CYCLONEDX_CRATE_VERSION" "cargo-auditable@$CARGO_AUDITABLE_CRATE_VERSION"
+cargo install --quiet --locked "cargo-cyclonedx@$CARGO_CYCLONEDX_CRATE_VERSION" "cargo-auditable@$CARGO_AUDITABLE_CRATE_VERSION"
 EOF
 
 # Build artifacts will be available in /app.