diff --git a/pkgs/development/python-modules/pymc/default.nix b/pkgs/development/python-modules/pymc/default.nix
index 603136c65a22..4ac12b51bddb 100644
--- a/pkgs/development/python-modules/pymc/default.nix
+++ b/pkgs/development/python-modules/pymc/default.nix
@@ -22,14 +22,14 @@
 
 buildPythonPackage rec {
   pname = "pymc";
-  version = "5.20.0";
+  version = "5.20.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "pymc-devs";
     repo = "pymc";
     tag = "v${version}";
-    hash = "sha256-5iHm+q4ykXhCntUpZmEfZc1805+GoCQR3yrkQGJ2qQg=";
+    hash = "sha256-Vc+yjMd5XCM97Y0JIfII+PfNz0rx1hi9N370mgBbO+8=";
   };
 
   postPatch = ''
@@ -42,6 +42,10 @@ buildPythonPackage rec {
     versioneer
   ];
 
+  pythonRelaxDeps = [
+    "pytensor"
+  ];
+
   dependencies = [
     arviz
     cachetools
@@ -64,7 +68,7 @@ buildPythonPackage rec {
   meta = {
     description = "Bayesian estimation, particularly using Markov chain Monte Carlo (MCMC)";
     homepage = "https://github.com/pymc-devs/pymc";
-    changelog = "https://github.com/pymc-devs/pymc/releases/tag/${src.tag}";
+    changelog = "https://github.com/pymc-devs/pymc/releases/tag/v${version}";
     license = lib.licenses.asl20;
     maintainers = with lib.maintainers; [
       nidabdella