diff --git a/contrib/test.sh b/contrib/test.sh
index f06369c8..adee9fdf 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -4,6 +4,21 @@ set -ex
 
 CRATES="bitcoin hashes internals fuzz"
 DEPS="recent minimal"
+MSRV="1\.48\.0"
+
+# Test pinned versions.
+if cargo --version | grep ${MSRV}; then
+    cargo update -p serde_json --precise 1.0.99
+    cargo update -p serde --precise 1.0.156
+    cargo update -p quote --precise 1.0.30
+    cargo update -p proc-macro2 --precise 1.0.63
+    cargo update -p serde_test --precise 1.0.175
+
+    cargo update -p bitcoin:0.30.1 --precise 0.30.0
+
+    # Build MSRV with pinned versions.
+    cargo check --all-features --all-targets
+fi
 
 for dep in $DEPS
 do