diff --git a/Cargo.toml b/Cargo.toml
index c40c2dd..c8fcea2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,11 +26,11 @@ zip = { version = "0.6", default-features = false, features=["deflate"] }
 byteorder = "1"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-json5 = "*"
 
 fasteval = { version = "0.2.4", features= ["unsafe-vars"]}
 
 bincode = { version = "1.3.3" }
+json5 = "0.4.1"
 
 [profile.release]
 lto = "fat"
diff --git a/src/main.rs b/src/main.rs
index 4c2f2f1..2ec7f39 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,8 +25,8 @@ fn main() -> Result<(), Box<dyn Error>> {
             (about: "annotate a VCF/BCF with one or more echtvar files")
             (@arg echtvar: -e + takes_value number_of_values(1) ... "echtvar files to annotate with. can be specified many times")
             (@arg include: -i  +takes_value number_of_values(1) "expression that determines which variants to keep in output")
-            (@arg INPUT_VCF: +required "vcf")
-            (@arg OUTPUT_VCF: +required "path to bcf output file")
+            (@arg INPUT_VCF: +required "input vcf or bcf")
+            (@arg OUTPUT_VCF: +required "path to bcf/vcf.gz output file (determined by extension)")
         )
     );
     let matches = app.clone().get_matches();