Index: sequoia-git/Cargo.toml
===================================================================
--- sequoia-git.orig/Cargo.toml
+++ sequoia-git/Cargo.toml
@@ -64,7 +64,7 @@ features = [
 version = ">=5, <7"
 
 [dependencies.git2]
-version = "0.19"
+version = ">= 0.19, < 0.21"
 default-features = false
 
 [dependencies.once_cell]