diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
new file mode 100644
index 0000000..08ec2a6
--- /dev/null
+++ b/Cargo-minimal.lock
@@ -0,0 +1,312 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+ "rand_pcg",
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diff --git a/contrib/test.sh b/contrib/test.sh
index 235aa0b..85ddac4 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -9,6 +9,10 @@ rustc --version
 
 # Pin dependencies as required if we are using MSRV toolchain.
 if cargo --version | grep "1\.41"; then
+    cp Cargo-minimal.lock Cargo.lock
+    cargo check --locked
+    rm Cargo.lock
+
     cargo update --package "bitcoin_hashes" --precise "0.12.0"
     cargo update --package "rand" --precise "0.6.0"
     cargo update --package "libc" --precise "0.2.151"