diff --git a/pkgs/development/python-modules/gto/default.nix b/pkgs/development/python-modules/gto/default.nix
index 8ee83e7b84dd..411804fe201c 100644
--- a/pkgs/development/python-modules/gto/default.nix
+++ b/pkgs/development/python-modules/gto/default.nix
@@ -1,8 +1,8 @@
 {
   lib,
   buildPythonPackage,
+  cacert,
   entrypoints,
-  fastentrypoints,
   fetchFromGitHub,
   freezegun,
   funcy,
@@ -68,6 +68,9 @@ buildPythonPackage rec {
 
     git config --global user.email "nobody@example.com"
     git config --global user.name "Nobody"
+
+    # _pygit2.GitError: OpenSSL error: failed to load certificates: error:00000000:lib(0)::reason(0)
+    export SSL_CERT_FILE=${cacert}/etc/ssl/certs/ca-bundle.crt
   '';
 
   disabledTests = [