CI: Fix release script

diff --git a/contrib/release.sh b/contrib/release.sh
index c0265794..73abdd01 100755
--- a/contrib/release.sh
+++ b/contrib/release.sh
@@ -2,33 +2,48 @@
 #
 # Check that we can publish crates in their current form if there are changes on top of the tip of
 # master that imply that we are about to do a release.
+#
+# disable follow sourced files.
+# shellcheck disable=SC1091
 
 set -euox pipefail
 
+REPO_DIR=$(git rev-parse --show-toplevel)
+
+# Sets CRATES to be a list of all crates in the repo.
+. "$REPO_DIR"/contrib/test_vars.sh
+
 main () {
-    for crate in "bitcoin" "hashes" "internals" "units"; do
-        if release_changes $crate; then
+    for crate in $CRATES; do
+        if release_changes "$crate"; then
             echo "$crate has changes implying this is a release PR, checking if we can publish ..."
 
             # Check if there is any mention of TBD which means the
             # next version number should be filled in.
-            if grep -qr "since = \"TBD" ./$crate; then
+            if grep -qr "since = \"TBD" "./$crate"; then
                 echo Version number needs to be filled in following places:
-                grep -r "since = \"TBD" ./$crate
+                grep -r "since = \"TBD" "./$crate"
                 exit 1
             fi
 
             # Then try to dry-run cargo publish
-            publish_dry_run $crate
+            publish_dry_run "$crate"
         fi
     done
 }
 
 # Returns 0 if crate ($1) contains changes since tip of master that imply this patch set is done in
 # preparation for releasing the crate.
+
 release_changes() {
     local crate=$1
-    git log --patch --reverse master.. -- "$crate"/Cargo.toml | grep version
+    set +e
+
+    git log --patch --reverse master.. -- "$crate"/Cargo.toml | grep -E '\+version ='
+    local exit_code=$?
+
+    set -e
+    return $exit_code
 }
 
 # Do a dry run publish to crates.io using the correct package name for crate ($1).