diff --git a/test/update-contract-ids.sh b/test/update-contract-ids.sh
index 23c82db18a9..591a2a7052d 100755
--- a/test/update-contract-ids.sh
+++ b/test/update-contract-ids.sh
@@ -1,10 +1,23 @@
 #! /bin/bash
 
-# CHANGES=$(git status --porcelain | wc -l)
-# if [ "$CHANGES" != "0" ]; then
-#   echo "git state is not clean. commit or restore first."
-#   exit
-# fi
+print_help() {
+    echo "
+ -i          run interactively
+";
+}
+
+INTERACTIVELY="0"
+
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        -i) INTERACTIVELY="1"; shift ;;
+        *) print_help; exit 1 ;;
+    esac
+    shift
+done
+
+
+CHANGES=$(git status --porcelain | wc -l)
 
 BOLD_RED='\033[1;31m'
 BOLD_GREEN="\033[1;32m"
@@ -19,13 +32,27 @@ function join_by {
   fi
 }
 
+ask_confirmation() {
+    echo -e "${BOLD_WHITE}Command below needs confirmation before running.${NC} $2"
+    echo "> $1"
+    read -p "Run the command above? (y/n) " -n 1 -r </dev/tty
+    echo
+    if [[ $REPLY =~ ^[Yy]$ ]]
+    then
+        bash -c "$1"
+    else
+        exit 1
+    fi
+}
+
 grep --include \*.sw -Hno "// AUTO-CONTRACT-ID" . -R | while read line ; do
     PARTS=($(echo $line | sed 's/:/ /g'))
     FOLDER=$(dirname ${PARTS[0]})
     FILE=${PARTS[0]}
     LINE=${PARTS[1]}
 
-    CONTRACT_ARGS=($(sed "$LINE!d" $FILE))
+    SED_COMMAND="${LINE}"'!d'
+    CONTRACT_ARGS=($(sed "$SED_COMMAND" $FILE))
     CONTRACT_ARGS=$(join_by " " ${CONTRACT_ARGS[@]:6})
 
     if [[ $CONTRACT_ARGS ]]; then 
@@ -37,8 +64,33 @@ grep --include \*.sw -Hno "// AUTO-CONTRACT-ID" . -R | while read line ; do
 
         if [[ $CONTRACT_ID ]]; then 
             popd >> /dev/null
-            sed -i "${LINE}s/0x[a-zA-Z0-9]*/$CONTRACT_ID/g" $FILE
-            echo -e "    ${BOLD_GREEN}ok${NC} ($CONTRACT_ID)"
+
+            SED_EXPR="${LINE}s/0x[a-zA-Z0-9]*/$CONTRACT_ID/g"
+
+            # check if there is a diff
+            diff -s --color <(cat $FILE) <(cat $FILE | sed --expression="$SED_EXPR") > /dev/null
+            if [ $? -eq 0 ]; then
+              # no diff, continue
+              echo -e "    ${BOLD_GREEN}no changes needed${NC} ($CONTRACT_ID)"
+            else 
+              # diff detected, check we are clean to update files, if not abort
+              if [[ "$INTERACTIVELY" == "0" ]]; then
+                # Don´t change anything if git is dirty
+                if [ "$CHANGES" != "0" ]; then
+                  echo -e "    ${BOLD_RED}Aborting${NC} This contract id needs update, but git state is not clean. commit, restore first or run with \"-i\"."
+                  echo $FILE
+                  diff -s --color <(cat $FILE) <(cat $FILE | sed --expression="$SED_EXPR")
+                  exit
+                fi
+                # we are clean and can update files
+                sed -i "$SED_EXPR" $FILE
+              else
+                # ask confirmation before applying the change
+                diff -s --color <(cat $FILE) <(cat $FILE | sed --expression="$SED_EXPR")
+                ask_confirmation "sed -i \"$SED_EXPR\" $FILE" "Update contract id"
+              fi
+              echo -e "    ${BOLD_GREEN}updated${NC} ($CONTRACT_ID)"
+            fi
         else
             echo -e "    ${BOLD_RED}error${NC}"
             cargo r -p forc --release -- contract-id --release