diff --git a/flake.lock b/flake.lock
index 9398ccd..75bc3cc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -68,16 +68,16 @@
     "libgit2": {
       "flake": false,
       "locked": {
-        "lastModified": 1703195592,
-        "narHash": "sha256-yCyV1Bn97V7CwppgdvCSu7nTYn2pQ1qN+xzY/txI2vM=",
-        "owner": "u-quark",
+        "lastModified": 1721209236,
+        "narHash": "sha256-tDUQi+s8sxJ30SmUH7Ln9WmDz5jGatlgKumjwi7KnCo=",
+        "owner": "libgit2",
         "repo": "libgit2",
-        "rev": "17f7213f88c7272d1503479c9cac56abeb3a2a8f",
+        "rev": "503b66cf00ad7dca940148529f60b1a409ccc462",
         "type": "github"
       },
       "original": {
-        "owner": "u-quark",
-        "ref": "gg",
+        "owner": "libgit2",
+        "ref": "503b66cf",
         "repo": "libgit2",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index ddc2a0b..b177964 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,7 +8,7 @@
       flake = false;
     };
     libgit2 = {
-      url = "github:u-quark/libgit2?ref=gg";
+      url = "github:libgit2/libgit2?ref=503b66cf";
       flake = false;
     };
     vty = {
diff --git a/src/GG/Repo/Commit.hs b/src/GG/Repo/Commit.hs
index 6661376..05be90d 100644
--- a/src/GG/Repo/Commit.hs
+++ b/src/GG/Repo/Commit.hs
@@ -76,7 +76,7 @@ getSignature commitContent program keyM = do
 createCommit :: G.Repository -> G.Signature -> String -> G.Tree -> [G.Commit] -> IO CreateCommitResult
 createCommit repo author message tree parents = do
   signConfig <- getSignConfig repo
-  committer <- G.signatureDefaultCommitter repo
+  (_author, committer) <- G.signatureDefaultFromEnv repo
   commitContent <- G.commitCreateBuffer repo author committer "UTF-8" message tree parents
   signatureME <-
     case signConfig of
diff --git a/src/Libgit2/Signature.chs b/src/Libgit2/Signature.chs
index 6933c75..bdcb73a 100644
--- a/src/Libgit2/Signature.chs
+++ b/src/Libgit2/Signature.chs
@@ -20,8 +20,7 @@ module Libgit2.Signature
   , signatureName
   , signatureEmail
   , signatureWhen
-  , signatureDefaultAuthor
-  , signatureDefaultCommitter
+  , signatureDefaultFromEnv
   ) where
 
 {#import Libgit2.Types#}
@@ -53,6 +52,4 @@ signatureWhen (Signature fp) =
     pure $ gitToLocalTime time offset
   )
 
-{#fun signature_default_author as signatureDefaultAuthor { alloca- `Signature' peekNewSignature*, `Repository' } -> `Int' checkReturnCode*-#}
-
-{#fun signature_default_committer as signatureDefaultCommitter { alloca- `Signature' peekNewSignature*, `Repository' } -> `Int' checkReturnCode*-#}
+{#fun signature_default_from_env as signatureDefaultFromEnv { alloca- `Signature' peekNewSignature*, alloca- `Signature' peekNewSignature*, `Repository' } -> `Int' checkReturnCode*-#}