diff --git a/setup.py b/setup.py
index ef5ba4c9..7d361023 100644
--- a/setup.py
+++ b/setup.py
@@ -74,7 +74,7 @@ def getVersionNumber():
     project_urls=PROJECT_URLS,
     python_requires=">=3.9",
     install_requires=[
-        "gemmi>=0.5.5, <=0.6.6",
+        "gemmi>=0.5.5, <=0.6.7",
         "pandas>=2.2.2, <=2.2.2",
         "numpy",
         "scipy",