diff --git a/pkgs/development/libraries/aws-c-cal/default.nix b/pkgs/development/libraries/aws-c-cal/default.nix
index 5f4c303265d9..6b88fa8aa47e 100644
--- a/pkgs/development/libraries/aws-c-cal/default.nix
+++ b/pkgs/development/libraries/aws-c-cal/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "aws-c-cal";
-  version = "0.6.12";
+  version = "0.6.15";
 
   src = fetchFromGitHub {
     owner = "awslabs";
     repo = finalAttrs.pname;
     rev = "v${finalAttrs.version}";
-    hash = "sha256-aegK01wYdOc6RGNVf/dZKn1HkqQr+yEblcu6hnlMZE4=";
+    hash = "sha256-RrUJz3IqwbBJ8NuJTIWqK33FlJHolcaid55PT2EhO24=";
   };
 
   patches = [