diff --git a/docs/CHANGELOG.md b/CHANGELOG.md
similarity index 99%
rename from docs/CHANGELOG.md
rename to CHANGELOG.md
index 4835bc3..47ae831 100644
--- a/docs/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,12 +6,16 @@
 
 ### Maintenance and fixes
 
-- Fix bug when intercept is inserted after categorical variable (#102)
-
 ### Documentation
 
 ### Deprecation
 
+## v0.5.1 Unreleased
+
+### Maintenance and fixes
+
+- Fix bug when intercept is inserted after categorical variable (#102)
+
 ## v0.5.0
 
 ### New features
diff --git a/formulae/version.txt b/formulae/version.txt
index 79a2734..5d4294b 100644
--- a/formulae/version.txt
+++ b/formulae/version.txt
@@ -1 +1 @@
-0.5.0
\ No newline at end of file
+0.5.1
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index b3cb9fc..98a8871 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,4 +45,4 @@ version = {file = "formulae/version.txt"}
 
 [tool.black]
 line-length = 100
-target-version = ["py37", "py38", "py39"]
\ No newline at end of file
+target-version = ["py39", "py310"]
\ No newline at end of file