diff --git a/scripts/pipfreeze.sh b/scripts/pipfreeze.sh
index b9493c5e..e6bc86f5 100755
--- a/scripts/pipfreeze.sh
+++ b/scripts/pipfreeze.sh
@@ -1,2 +1,3 @@
 #!/bin/bash
-pip freeze >scripts/configs/requirements.txt
\ No newline at end of file
+# Ignore gymlib because we install it manually inside _build_conda_env.sh (not from requirements.txt).
+pip freeze | grep -v "^gymlib @" >scripts/configs/requirements.txt
\ No newline at end of file