diff --git a/CHANGELOG b/CHANGELOG
index 790a153..fd4904a 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+v0.6.6
+- Revert return type to List for ProteinGroups.get_protein_groups
+
 v0.6.5
 - Fix check for peptides not assigned to any protein group
 - Fix for docker interactive mode
diff --git a/pyproject.toml b/pyproject.toml
index 7f7aa95..ad771c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "picked_group_fdr"
-version = "0.6.5"
+version = "0.6.6"
 description = "Scalable, accurate and sensitive protein group FDRs for large-scale mass spectrometry experiments"
 authors = ["Matthew The <matthew.the@tum.de>"]
 license= "Apache-2.0"