diff --git a/compressor/cache.py b/compressor/cache.py
index 6f6657d..7561e6c 100644
--- a/compressor/cache.py
+++ b/compressor/cache.py
@@ -18,7 +18,7 @@ _cachekey_func = None
 
 
 def get_hexdigest(plaintext, length=None):
-    digest = hashlib.md5(smart_bytes(plaintext)).hexdigest()
+    digest = hashlib.sha256(smart_bytes(plaintext)).hexdigest()
     if length:
         return digest[:length]
     return digest