diff --git a/Cargo.toml b/Cargo.toml
index 0852294..7f24dca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,5 +20,5 @@ repository = "fastobo/fastobo-syntax"
 status     = "actively-developed"
 
 [dependencies]
-pest = "=2.1.3"
-pest_derive = "=2.1.0"
+pest = "2.5.1"
+pest_derive = "2.5.1"