diff --git a/Dockerfile b/Dockerfile
index 4da0eb6..a6812e6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,11 @@ RUN printf '{"version":"%s","buildDate":"%s"}\n' "${VERSION}" "${BUILD_DATE}" >
 COPY index.html /usr/share/nginx/html/
 COPY src/ /usr/share/nginx/html/src/
 
+# Copy and run cache busting script (bash/sed - no external dependencies needed)
+COPY build-cache-bust.sh /tmp/build-cache-bust.sh
+RUN chmod +x /tmp/build-cache-bust.sh && \
+    /tmp/build-cache-bust.sh "${VERSION}" /usr/share/nginx/html
+
 # Copy nginx configuration
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 
diff --git a/build-cache-bust.sh b/build-cache-bust.sh
new file mode 100755
index 0000000..ecac517
--- /dev/null
+++ b/build-cache-bust.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+# Simple cache busting script - adds version query params to all JS imports
+# Only runs during Docker build, not during local development
+# This keeps development simple (no tools needed) while ensuring production cache busting
+
+VERSION="${1:-dev}"
+SRC_DIR="${2:-/usr/share/nginx/html}"
+
+echo "Adding cache busting (v=${VERSION}) to JS imports in ${SRC_DIR}/src..."
+
+# Find all JS files and add version query param to relative imports
+find "$SRC_DIR/src" -type f -name "*.js" | while read -r file; do
+  # Skip if file doesn't exist
+  [ ! -f "$file" ] && continue
+  
+  # Process file with sed to add version query params
+  # Pattern: from './path.js' or from "../path.js" or import('./path.js')
+  # Only match relative imports (./ or ../) ending in .js
+  # Skip if already has query params (contains ?)
+  
+  # Handle single quote imports: from './path.js'
+  sed -i.bak \
+    -e "s|from '\\(\\.[./][^']*\\.js\\)'|from '\\1?v=${VERSION}'|g" \
+    -e "s|from '\\(\\.[./][^']*\\.js\\)?[^']*'|from '\\1?v=${VERSION}'|g" \
+    "$file"
+  
+  # Handle double quote imports: from "./path.js"
+  sed -i.bak \
+    -e "s|from \"\\(\\.[./][^\"]*\\.js\\)\"|from \"\\1?v=${VERSION}\"|g" \
+    -e "s|from \"\\(\\.[./][^\"]*\\.js\\)?[^\"]*\"|from \"\\1?v=${VERSION}\"|g" \
+    "$file"
+  
+  # Handle dynamic imports: import('./path.js')
+  sed -i.bak \
+    -e "s|import('\\(\\.[./][^']*\\.js\\)')|import('\\1?v=${VERSION}')|g" \
+    -e "s|import('\\(\\.[./][^']*\\.js\\)?[^']*')|import('\\1?v=${VERSION}')|g" \
+    -e "s|import(\"\\(\\.[./][^\"]*\\.js\\)\")|import(\"\\1?v=${VERSION}\")|g" \
+    -e "s|import(\"\\(\\.[./][^\"]*\\.js\\)?[^\"]*\")|import(\"\\1?v=${VERSION}\")|g" \
+    "$file"
+  
+  # Remove backup file
+  rm -f "${file}.bak"
+done
+
+echo "Cache busting complete! All JS imports now include ?v=${VERSION}"
+
diff --git a/nginx.conf b/nginx.conf
index eee0bb3..b7b147e 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -9,11 +9,19 @@ server {
         try_files $uri $uri/ =404;
     }
     
-    # Prevent caching of JavaScript files and version.json
-    location ~* \.(js|mjs)$ {
-        add_header Cache-Control "no-cache, no-store, must-revalidate";
-        add_header Pragma "no-cache";
-        add_header Expires "0";
+    # Cache JavaScript files with version query params for 1 year (immutable)
+    # Files without version params are not cached
+    location ~* \.(js|mjs)(\?v=[^&]+)?$ {
+        if ($args ~ "v=") {
+            # Has version param - cache for 1 year (immutable)
+            add_header Cache-Control "public, max-age=31536000, immutable";
+        }
+        if ($args !~ "v=") {
+            # No version param - don't cache
+            add_header Cache-Control "no-cache, no-store, must-revalidate";
+            add_header Pragma "no-cache";
+            add_header Expires "0";
+        }
         add_header Vary "Accept-Encoding";
     }