diff --git a/pkgs/development/python-modules/formulaic/default.nix b/pkgs/development/python-modules/formulaic/default.nix
index ee149c96832c7..147aa22dfdc1f 100644
--- a/pkgs/development/python-modules/formulaic/default.nix
+++ b/pkgs/development/python-modules/formulaic/default.nix
@@ -18,7 +18,7 @@
 
 buildPythonPackage rec {
   pname = "formulaic";
-  version = "1.0.2";
+  version = "1.1.1";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
@@ -26,8 +26,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "matthewwardrop";
     repo = "formulaic";
-    rev = "refs/tags/v${version}";
-    hash = "sha256-1Ygu4o6RXXTnvve8XZi+QMhCjvUyMspYWTyUH3p6+dg=";
+    tag = "v${version}";
+    hash = "sha256-7vmnibL0PMZWL/unUQxN4GtLPSYKmGnhDNtE5GRDFHk=";
   };
 
   env.SETUPTOOLS_SCM_PRETEND_VERSION = version;