diff --git a/pkgs/applications/science/astronomy/calcmysky/default.nix b/pkgs/applications/science/astronomy/calcmysky/default.nix
index 3b66284e8b0..bcbc90fa371 100644
--- a/pkgs/applications/science/astronomy/calcmysky/default.nix
+++ b/pkgs/applications/science/astronomy/calcmysky/default.nix
@@ -10,13 +10,13 @@
 
 stdenv.mkDerivation rec {
   pname = "calcmysky";
-  version = "0.2.1";
+  version = "unstable-2023-02-11";
 
   src = fetchFromGitHub {
     owner = "10110111";
     repo = "CalcMySky";
-    rev = "v${version}";
-    hash = "sha256-7Yj6OlZ7weenekXYGhK5EWcME20oCHiLPOxz5KEuKy4=";
+    rev = "c5f281452816d8de775b13a70fb90e79427c93c4";
+    hash = "sha256-mzxtu6YTaZpR17m2WGiSDo/bAPXGJdQskyz7aqtxGoQ=";
   };
 
   nativeBuildInputs = [ cmake wrapQtAppsHook ];
diff --git a/pkgs/applications/science/astronomy/stellarium/default.nix b/pkgs/applications/science/astronomy/stellarium/default.nix
index 89ba8bf0e9d..c3880b0b1d2 100644
--- a/pkgs/applications/science/astronomy/stellarium/default.nix
+++ b/pkgs/applications/science/astronomy/stellarium/default.nix
@@ -21,13 +21,13 @@
 
 stdenv.mkDerivation rec {
   pname = "stellarium";
-  version = "1.2";
+  version = "23.1";
 
   src = fetchFromGitHub {
     owner = "Stellarium";
     repo = "stellarium";
     rev = "v${version}";
-    sha256 = "sha256-0/ZSe6QfM2zVsqcbyqefl9hiuex72KPxJvVMRNCnpZg=";
+    hash = "sha256-7jzS3pRklPsCTgCr3nrywfHCNlBDHuyuGGvrVoI9+A0=";
   };
 
   nativeBuildInputs = [