diff --git a/requirements.txt b/requirements.txt
index c856bc047807f663292dbdf120cbe18e3d2e6891..6c8f37a8d44526461a16bd8090e55d7880b1a1e7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 # wexpect
 git+https://github.com/raczben/wexpect.git@dev # Changing to dev bc of venv incompatibility stuff. (th juli 2023: problem with 4.0.0).
 pexpect
+pybtex