diff --git a/bitcoind/contrib/extra_tests.sh b/bitcoind/contrib/extra_tests.sh
deleted file mode 100755
index e5be55dd3..000000000
--- a/bitcoind/contrib/extra_tests.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env bash
-#
-# Run Bitcoin Core version specific tests.
-#
-# The `node` crate features are different from a normal crate because:
-#
-# - `node` cannot be built with --no-default-features
-# - `node` expects at least one version feature e.g., --features=28_0
-# - `node` supports downloading the Bitcoin Core binary and also running `bitcoind` from the host.
-#
-# In CI we always want to download the Bitcoin Core binary. This means we always enable `download`.
-# Also, we always enable exactly one feature (even though multiple features will just cause the
-# higher one to override the lower one).
-
-set -euox pipefail
-
-FEATURES=("30_2" "30_0" "29_0" "28_2" "28_1" "28_0" "27_1" "27_0" "26_2" "25_2" \
-          "24_2" "23_2" "22_1" "0_21_2" "0_20_2" "0_19_1" "0_18_1" "0_17_2")
-
-# Use the current `Cargo.lock` file without updating it.
-cargo="cargo --locked"
-
-
-main() {
-    $cargo check --all-features
-    $cargo check --doc
-
-    # Build every version.
-    for feature in "${FEATURES[@]}"; do
-        $cargo build --features="$feature"
-    done
-
-    # But only run tests for the latest version. This is ok because we are mainly checking
-    # MSRV and docs with this script. Integration test will check every Core version.
-    $cargo test --features=download,29_0
-}
-
-#
-# Main script
-#
-main "$@"
-exit 0
diff --git a/contrib/crates.sh b/contrib/crates.sh
deleted file mode 100755
index c084fcb15..000000000
--- a/contrib/crates.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-# No shebang, this file should not be executed.
-# shellcheck disable=SC2148
-
-# Crates in this workspace to test.
-CRATES=("bitreq" "client" "jsonrpc" "types")
diff --git a/contrib/update-lock-files.sh b/contrib/update-lock-files.sh
deleted file mode 100755
index 672e9197b..000000000
--- a/contrib/update-lock-files.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/env bash
-#
-# Update the minimal/recent lock file
-
-set -euo pipefail
-
-REPO_DIR="$(git rev-parse --show-toplevel)"
-
-# Targets where `--all-features` is used.
-ALL_FEATURE_CRATES=(bitreq client fuzz jsonrpc types verify)
-
-# Targets with conflicting features and only speficic features are used.
-SPECIFIC_FEATURES_CRATES=(integration_test bitcoind)
-SPECIFIC_FEATURES=(latest)
-
-update_lock_files() {
-    for crate in "${ALL_FEATURE_CRATES[@]}"; do
-        cargo check --manifest-path "$REPO_DIR/$crate/Cargo.toml" --all-features
-    done
-
-    for crate in "${SPECIFIC_FEATURES_CRATES[@]}"; do
-        cargo check --manifest-path "$REPO_DIR/$crate/Cargo.toml" --no-default-features --features="${SPECIFIC_FEATURES[*]}"
-    done
-}
-
-for file in Cargo-minimal.lock Cargo-recent.lock; do
-    cp --force "$file" Cargo.lock
-    update_lock_files
-    cp --force Cargo.lock "$file"
-done
diff --git a/justfile b/justfile
index 702445609..ffd0f6fbd 100644
--- a/justfile
+++ b/justfile
@@ -59,4 +59,22 @@ docsrs *flags:
 
 # Update the recent and minimal lock files.
 update-lock-files:
-  contrib/update-lock-files.sh
+  just update-lock-file Cargo-minimal.lock
+  just update-lock-file Cargo-recent.lock
+
+update-lock-file file:
+  cp --force {{file}} Cargo.lock
+  for crate in {{ALL_FEATURE_CRATES}}; do \
+      cargo check \
+          --manifest-path "$REPO_DIR/$crate/Cargo.toml" \
+          --all-features \
+      || exit 1; \
+  done
+  for crate in {{SPECIFIC_FEATURES_CRATES}}; do \
+      cargo check \
+          --manifest-path "$REPO_DIR/$crate/Cargo.toml" \
+          --no-default-features \
+          --features="{{SPECIFIC_FEATURES}}" \
+      || exit 1; \
+  done
+  cp --force Cargo.lock {{file}}