diff --git a/ci/lint-aux.sh b/ci/lint-aux.sh
index 3f8abc8..1b87301 100755
--- a/ci/lint-aux.sh
+++ b/ci/lint-aux.sh
@@ -3,6 +3,41 @@ set -euo pipefail
 
 . ci/utils.sh
 
+crates=(
+  rsjsonnet-lang
+  rsjsonnet-front
+  rsjsonnet
+)
+
+begin_group "Check crate versions"
+
+expected_version="$(crate_version rsjsonnet)"
+for crate in "${crates[@]}"; do
+  version="$(crate_version "$crate")"
+
+  if [[ ! "$version" =~ ^[0-9].[0-9].[0-9](-pre)?$ ]]; then
+    echo "Invalid version for $crate"
+    exit 1
+  fi
+
+  if [[ "$version" = *-pre ]]; then
+    publish_ok="$(crate_metadata "$crate" | jq '.publish == []')"
+  else
+    publish_ok="$(crate_metadata "$crate" | jq '.publish == null')"
+  fi
+  if ! "$publish_ok"; then
+    echo "Invalid publish for $crate"
+    exit 1
+  fi
+
+  if [ "$version" != "$expected_version" ]; then
+    echo "Incorrect version for $crate"
+    exit 1
+  fi
+done
+
+end_group
+
 begin_group "Check MSRV consistency"
 
 msrv="$(cat ci/rust-versions/msrv.txt)"
@@ -22,12 +57,6 @@ for readme in "${msrv_readmes[@]}"; do
   fi
 done
 
-crates=(
-  rsjsonnet-lang
-  rsjsonnet-front
-  rsjsonnet
-)
-
 for crate in "${crates[@]}"; do
   if [ "$(crate_metadata "$crate" | jq -r '.rust_version')" != "$msrv" ]; then
     echo "Incorrect rust-version for $crate"
diff --git a/ci/utils.sh b/ci/utils.sh
index 39e5fb5..9bb6271 100644
--- a/ci/utils.sh
+++ b/ci/utils.sh
@@ -35,3 +35,12 @@ crate_metadata() {
       end
   "
 }
+
+crate_version() {
+  if [ $# -ne 1 ]; then
+    echo_stderr "Invalid use of $0"
+    exit 1
+  fi
+  crate="$1"
+  crate_metadata "$crate" | jq -r '.version'
+}