diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 5c41512e..227c6400 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,7 +27,6 @@ jobs:
                   profile: minimal
                   toolchain: ${{ matrix.rust }}
                   override: true
-            - run: cargo update -p serde --precise 1.0.152
             - name: Running test script
               env: ${{ matrix.env }}
               run: ./contrib/test.sh
diff --git a/contrib/test.sh b/contrib/test.sh
index 9c0e908f..1230849b 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -1,6 +1,8 @@
 
 set -xe
 
+MSRV="1\.41"
+
 # Just echo all the relevant env vars to help debug Travis.
 echo "RUSTFMTCHECK: \"$RUSTFMTCHECK\""
 echo "BITCOINVERSION: \"$BITCOINVERSION\""
@@ -11,6 +13,15 @@ if [ -n "$RUSTFMTCHECK" ]; then
   cargo fmt --all -- --check
 fi
 
+# Test pinned versions (these are from rust-bitcoin pinning for 1.48).
+if cargo --version | grep ${MSRV}; then
+    cargo update -p log --precise 0.4.18
+    cargo update -p serde_json --precise 1.0.99
+    cargo update -p serde --precise 1.0.156
+    cargo update -p quote --precise 1.0.30
+    cargo update -p proc-macro2 --precise 1.0.63
+fi
+
 # Integration test.
 if [ -n "$BITCOINVERSION" ]; then
     wget https://bitcoincore.org/bin/bitcoin-core-$BITCOINVERSION/bitcoin-$BITCOINVERSION-x86_64-linux-gnu.tar.gz