diff --git a/src/blog.rs b/src/blog.rs
index a78ab70..014df44 100644
--- a/src/blog.rs
+++ b/src/blog.rs
@@ -7,6 +7,7 @@
 use crate::store;
 use crate::utils::*;
 use pulldown_cmark::*;
+use rbtag::BuildDateTime;
 use serde::{Serialize, Deserialize};
 use std::vec::Vec;
 
@@ -115,12 +116,13 @@ impl Post {
     }
 }
 
-// This should be bumped each time the parsing / compiling
-// logic of Markdown changes, and each time the Markdown
-// library updates. Updaing this value invalidates all
-// existing cache and they will be recompiled when someone
-// visits.
-const CACHE_VERSION: &'static str = "0017";
+lazy_static! {
+    // Whenever this is changed, all cache will be invalided
+    // Use build timestamp string
+    static ref CACHE_VERSION: String = {
+        format!("{}", BuildTag{}.get_build_timestamp())
+    };
+}
 
 // The prefix path used for caching remote images
 pub const IMG_CACHE_PREFIX: &'static str = "/imgcache/";
@@ -187,7 +189,7 @@ impl PostContentCache {
             Err(_) => return None
         };
 
-        if cache.version != CACHE_VERSION {
+        if cache.version != *CACHE_VERSION {
             return None;
         }