diff --git a/.gitignore b/.gitignore
index 2e9d7ce..f5cf9bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ htmlcov/
 # Generated by doc build
 doc/_static/basis-*.png
 doc/savefig/
+venv
 
 # Cribbed from numpy's .gitignore:
 
diff --git a/patsy/version.py b/patsy/version.py
index ff66d3a..9ea6b6a 100644
--- a/patsy/version.py
+++ b/patsy/version.py
@@ -17,4 +17,4 @@
 # want. (Contrast with the special suffix 1.0.0.dev, which sorts *before*
 # 1.0.0.)
 
-__version__ = "0.5.6"
+__version__ = "1.0.0"
diff --git a/setup.py b/setup.py
index e1b63c7..4613449 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
     },
     python_requires=">=3.6",
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 6 - Mature",
         "Intended Audience :: Developers",
         "Intended Audience :: Science/Research",
         "Intended Audience :: Financial and Insurance Industry",