diff --git a/Cargo.toml b/Cargo.toml
index 122afeb..5cb07fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 pdf-extract = ""
-lopdf = ""
+lopdf = "0.15.3"
 
 [profile.release]
 panic = 'abort'