diff --git a/cratebibtex/Cargo.lock.orig b/cratebibtex/Cargo.lock
--- a/cratebibtex/Cargo.lock.orig	2022-09-28 23:15:43.000000000 +0300
+++ b/cratebibtex/Cargo.lock	2023-05-22 10:40:54.834009873 +0300
@@ -321,7 +321,7 @@
 [[package]]
 name = "nom-bibtex"
 version = "0.3.0"
-source = "git+https://github.com/A6GibKm/nom-bibtex.git#3e20b1f6a1f8709bf61836f171b8d90cb84cd8b3"
+source = "git+https://github.com/charlesvdv/nom-bibtex.git#20a3ea578f37b1b25e50546cc870133c1203788f"
 dependencies = [
  "nom",
  "nom-tracable",
---

diff --git a/cratebibtex/Cargo.toml.orig b/cratebibtex/Cargo.toml
--- a/cratebibtex/Cargo.toml.orig	2022-09-28 23:15:43.000000000 +0300
+++ b/cratebibtex/Cargo.toml	2023-05-22 10:43:45.345011010 +0300
@@ -9,6 +9,6 @@
 gio = "0.15"
 glib = { version = "0.15", features = ["v2_72"] }
 log = "0.4"
-nom-bibtex = { git = "https://github.com/A6GibKm/nom-bibtex.git" }
+nom-bibtex = { git = "https://github.com/charlesvdv/nom-bibtex" }
 once_cell = "1.12"
 regex = "1.5"
---

diff --git a/cratebibtex/src/entry.rs b/cratebibtex/src/entry.rs
index 5915812..50e3d3d 100644
--- a/cratebibtex/src/entry.rs
+++ b/cratebibtex/src/entry.rs
@@ -164,7 +164,11 @@ impl Default for Entry {
 
 impl From<&nom_bibtex::Bibliography> for Entry {
     fn from(bib: &nom_bibtex::Bibliography) -> Self {
-        let tags = bib.tags();
+        let tags: HashMap<String, String> = bib
+            .tags()
+            .iter()
+            .map(|(k, v)| (k.to_lowercase(), v.clone()))
+            .collect();
         let entry = Self::default();
         entry.imp().tags.replace(tags);
         entry
--