diff --git a/pkgs/development/python-modules/rawpy/default.nix b/pkgs/development/python-modules/rawpy/default.nix
index 58913a5531b9..6a9c7a1a2fd1 100644
--- a/pkgs/development/python-modules/rawpy/default.nix
+++ b/pkgs/development/python-modules/rawpy/default.nix
@@ -24,14 +24,14 @@
 
 buildPythonPackage (finalAttrs: {
   pname = "rawpy";
-  version = "0.26.1";
+  version = "0.27.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "letmaik";
     repo = "rawpy";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-/pD3t6sP/SctjzjiOo2e937NEetvkcC5wB/RWi8UXI0=";
+    hash = "sha256-zM6S1oCOy6AWpaGgdgAqOUGW3rQ0Q9CxKMJoQTJPJIA=";
   };
 
   build-system = [
@@ -56,6 +56,12 @@ buildPythonPackage (finalAttrs: {
     RAWPY_USE_SYSTEM_LIBRAW = 1;
   };
 
+  # cmake is only needed to build libraw when `RAWPY_USE_SYSTEM_LIBRAW` is disabled
+  postPatch = ''
+    substituteInPlace pyproject.toml \
+      --replace-fail '"cmake",' ""
+  '';
+
   pythonImportsCheck = [
     "rawpy"
     "rawpy._rawpy"