diff --git a/.github/workflows/update_primary_nginx.yml b/.github/workflows/update_primary_nginx.yml
index aa15811..9380dd8 100644
--- a/.github/workflows/update_primary_nginx.yml
+++ b/.github/workflows/update_primary_nginx.yml
@@ -1,4 +1,4 @@
-name: Setup NGINX from the configuration file
+name: Setup nginx from the configuration file
 
 on:
   workflow_dispatch:
@@ -11,7 +11,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Load environment variables
+      - name: Dotenv Action
         uses: falti/dotenv-action@v1.1.4
         with:
           export-variables: true
@@ -20,18 +20,29 @@ jobs:
       - name: Check environment variables
         run: env
 
+      # Use sed to selectively replace environment variables in the nginx template
       - name: Create temporary nginx config file
         run: |
-          # Define the list of variables to replace
-          VARIABLES_TO_REPLACE="DEV_PORT_PREFIX STAG_PORT_PREFIX PROD_PORT_PREFIX BACKEND_POSTFIX FRONTEND_POSTFIX GATEWAY_POSTFIX"
-          # Use envsubst to replace only the specified variables
-          envsubst "$VARIABLES_TO_REPLACE" < ./nginx_template.txt > temp_default.conf
-
-      - name: Copy temporary file to correct place
+          sed -e "s/\$GROUP_ID/$GROUP_ID/g" \
+              -e "s/\$DOMAIN/$DOMAIN/g" \
+              -e "s/\$URL_PREFIX/$URL_PREFIX/g" \
+              -e "s/\$PORT_PREFIX/$PORT_PREFIX/g" \
+              -e "s/\$DEV_POSTFIX/$DEV_POSTFIX/g" \
+              -e "s/\$STAG_POSTFIX/$STAG_POSTFIX/g" \
+              -e "s/\$PROD_POSTFIX/$PROD_POSTFIX/g" \
+              -e "s/\$DEV_PORT_PREFIX/$DEV_PORT_PREFIX/g" \
+              -e "s/\$STAG_PORT_PREFIX/$STAG_PORT_PREFIX/g" \
+              -e "s/\$PROD_PORT_PREFIX/$PROD_PORT_PREFIX/g" \
+              -e "s/\$BACKEND_POSTFIX/$BACKEND_POSTFIX/g" \
+              -e "s/\$FRONTEND_POSTFIX/$FRONTEND_POSTFIX/g" \
+              -e "s/\$GATEWAY_POSTFIX/$GATEWAY_POSTFIX/g" \
+              ./nginx_template.txt > temp_default.conf
+
+      - name: Copy temporary file to correct place 
         run: sudo cp temp_default.conf /etc/nginx/conf.d/default.conf
 
       - name: Show nginx file
         run: cat /etc/nginx/conf.d/default.conf
 
-      - name: Reload NGINX
+      - name: Reload nginx
         run: sudo nginx -s reload