diff --git a/contrib/lockfile.sh b/contrib/lockfile.sh
index 4c57d0b0d..39f68d53f 100644
--- a/contrib/lockfile.sh
+++ b/contrib/lockfile.sh
@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-LOCKFILE="Cargo.lock"
-LOCKDIR=".bak"
-LOCKFILE_BAK="${LOCKDIR}/${LOCKFILE}"
+# Absolute paths so the EXIT trap restores the lockfile even if the sourcing
+# script changes directory after calling use_lockfile.
+LOCKFILE="${PWD}/Cargo.lock"
+LOCKDIR="${PWD}/.bak"
+LOCKFILE_BAK="${LOCKDIR}/Cargo.lock"
 
 _cleanup_lockfile() {
     if [ -f "$LOCKFILE_BAK" ]; then
diff --git a/payjoin-ffi/csharp/contrib/test.sh b/payjoin-ffi/csharp/contrib/test.sh
index 73cfcf3df..3445c3048 100755
--- a/payjoin-ffi/csharp/contrib/test.sh
+++ b/payjoin-ffi/csharp/contrib/test.sh
@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cd "$(dirname "$0")/.."
+# Build against the maintained lockfile instead of resolving the dependency
+# graph fresh on every run. use_lockfile copies Cargo-recent.lock into place
+# and restores the previous state when this script exits.
+REPO_ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+cd "$REPO_ROOT"
+source contrib/lockfile.sh
+use_lockfile Cargo-recent.lock
+
+cd "$REPO_ROOT/payjoin-ffi/csharp"
 
 echo "==> Generating FFI bindings..."
 bash ./scripts/generate_bindings.sh
diff --git a/payjoin-ffi/csharp/scripts/generate_bindings.ps1 b/payjoin-ffi/csharp/scripts/generate_bindings.ps1
index 52e782508..801a93fe2 100644
--- a/payjoin-ffi/csharp/scripts/generate_bindings.ps1
+++ b/payjoin-ffi/csharp/scripts/generate_bindings.ps1
@@ -36,6 +36,20 @@ $scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
 $payjoinFfiDir = Resolve-Path (Join-Path $scriptDir "..\..")
 Set-Location $payjoinFfiDir
 
+# Build against the maintained lockfile instead of resolving the dependency
+# graph fresh on every run; mirrors contrib/lockfile.sh for this Windows entry
+# point. The previous lockfile state is restored before the script exits.
+$repoRoot = Resolve-Path (Join-Path $payjoinFfiDir "..")
+$lockFile = Join-Path $repoRoot "Cargo.lock"
+$lockBackup = $null
+if (Test-Path $lockFile) {
+    $lockBackup = "$lockFile.bak"
+    Move-Item $lockFile $lockBackup -Force
+}
+Copy-Item (Join-Path $repoRoot "Cargo-recent.lock") $lockFile -Force
+
+try {
+
 Write-Host "Generating payjoin C#..."
 if ($null -ne $env:PAYJOIN_FFI_FEATURES) {
     $payjoinFfiFeatures = $env:PAYJOIN_FFI_FEATURES
@@ -73,4 +87,12 @@ Write-Host "Copying native library..."
 New-Item -ItemType Directory -Force -Path "csharp/lib" | Out-Null
 Copy-Item "../target/debug/$libName" "csharp/lib/$libName" -Force
 
+}
+finally {
+    Remove-Item $lockFile -Force -ErrorAction SilentlyContinue
+    if ($null -ne $lockBackup) {
+        Move-Item $lockBackup $lockFile -Force
+    }
+}
+
 Write-Host "All done!"
diff --git a/payjoin-ffi/dart/contrib/test.sh b/payjoin-ffi/dart/contrib/test.sh
index 35b3c16bf..227491e50 100755
--- a/payjoin-ffi/dart/contrib/test.sh
+++ b/payjoin-ffi/dart/contrib/test.sh
@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cd "$(dirname "$0")/.."
+# Build against the maintained lockfile instead of resolving the dependency
+# graph fresh on every run. use_lockfile copies Cargo-recent.lock into place
+# and restores the previous state when this script exits.
+REPO_ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+cd "$REPO_ROOT"
+source contrib/lockfile.sh
+use_lockfile Cargo-recent.lock
+
+cd "$REPO_ROOT/payjoin-ffi/dart"
 
 echo "==> Cleaning nested Cargo.lock..."
 rm -f native/Cargo.lock
diff --git a/payjoin-ffi/javascript/contrib/test.sh b/payjoin-ffi/javascript/contrib/test.sh
index 97166766e..4b91fbc59 100755
--- a/payjoin-ffi/javascript/contrib/test.sh
+++ b/payjoin-ffi/javascript/contrib/test.sh
@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cd "$(dirname "$0")/.."
+# Build against the maintained lockfile instead of resolving the dependency
+# graph fresh on every run. use_lockfile copies Cargo-recent.lock into place
+# and restores the previous state when this script exits.
+REPO_ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+cd "$REPO_ROOT"
+source contrib/lockfile.sh
+use_lockfile Cargo-recent.lock
+
+cd "$REPO_ROOT/payjoin-ffi/javascript"
 
 echo "==> Installing JavaScript dependencies..."
 npm ci
diff --git a/payjoin-ffi/python/contrib/test.sh b/payjoin-ffi/python/contrib/test.sh
index 46f9a2871..ac43385d0 100755
--- a/payjoin-ffi/python/contrib/test.sh
+++ b/payjoin-ffi/python/contrib/test.sh
@@ -1,7 +1,15 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cd "$(dirname "$0")/.."
+# Build against the maintained lockfile instead of resolving the dependency
+# graph fresh on every run. use_lockfile copies Cargo-recent.lock into place
+# and restores the previous state when this script exits.
+REPO_ROOT="$(cd "$(dirname "$0")/../../.." && pwd)"
+cd "$REPO_ROOT"
+source contrib/lockfile.sh
+use_lockfile Cargo-recent.lock
+
+cd "$REPO_ROOT/payjoin-ffi/python"
 
 echo "==> Syncing Python dependencies with uv..."
 uv sync --all-extras