diff --git a/nixos/modules/services/web-apps/pict-rs.nix b/nixos/modules/services/web-apps/pict-rs.nix
index 07f84578a59b..360dc4fe6418 100644
--- a/nixos/modules/services/web-apps/pict-rs.nix
+++ b/nixos/modules/services/web-apps/pict-rs.nix
@@ -3,9 +3,6 @@
 let
   cfg = config.services.pict-rs;
   inherit (lib) maintainers mkOption types;
-
-  is03 = lib.versionOlder cfg.package.version "0.4.0";
-
 in
 {
   meta.maintainers = with maintainers; [ happysalada ];
@@ -61,38 +58,62 @@ in
 
   config = lib.mkIf cfg.enable {
     services.pict-rs.package = lib.mkDefault (
-      # An incompatible db change happened in the transition from 0.3 to 0.4.
       if lib.versionAtLeast config.system.stateVersion "23.11"
       then pkgs.pict-rs
-      else pkgs.pict-rs_0_3
+      else throw ''
+        pict-rs made changes to the database schema between 0.3 and 0.4. It
+        will apply these automatically on the first run of 0.4, but the old
+        version will no longer work after that.
+
+        Your configuration is currently using the old default of pict-rs
+        0.3. Unfortunately, 0.3 no longer builds due to the Rust 1.80 update,
+        and has been removed. pict-rs has already been updated to 0.5 in
+        Nixpkgs, which has another schema change but removes the migration
+        logic for 0.3.
+
+        You will need to migrate to 0.4 first, and then to 0.5. As 0.4 is
+        no longer present in Nixpkgs, the recommended migration path is:
+
+        * Import a separate Nixpkgs old enough to contain 0.4, temporarily
+          set `services.pict-rs.package` to its pict-rs, set the
+          `PICTRS__OLD_DB__PATH` environment variable for the migration, and
+          activate your configuration to start it. The following configuration
+          snippet should work:
+
+              services.pict-rs.package =
+                (import (builtins.fetchTarball {
+                  url = "https://github.com/NixOS/nixpkgs/archive/9b19f5e77dd906cb52dade0b7bd280339d2a1f3d.tar.gz";
+                  sha256 = "sha256:0939vbhln9d33xkqw63nsk908k03fxihj85zaf70i3il9z42q8mc";
+                }) pkgs.config).pict-rs;
+
+              systemd.services.pict-rs.environment.PICTRS__OLD_DB__PATH = config.services.pict-rs.dataDir;
+
+        * After the migration to 0.4 completes, remove the package and
+          environment variable overrides, set `services.pict-rs.package` to
+          the current `pkgs.pict-rs` instead, and activate your configuration
+          to begin the migration to 0.5.
+
+        For more information, see:
+
+        * <https://git.asonix.dog/asonix/pict-rs/src/tag/v0.4.8#0-3-to-0-4-migration-guide>
+        * <https://git.asonix.dog/asonix/pict-rs/src/tag/v0.5.16#0-4-to-0-5-migration-guide>
+
+        The NixOS module will handle the configuration changes for you,
+        at least.
+      ''
     );
 
-    # Account for config differences between 0.3 and 0.4
-    assertions = [
-      {
-        assertion = !is03 || (cfg.repoPath == null && cfg.storePath == null);
-        message = ''
-          Using `services.pict-rs.repoPath` or `services.pict-rs.storePath` with pict-rs 0.3 or older has no effect.
-        '';
-      }
-    ];
-
     systemd.services.pict-rs = {
-      # Pict-rs split it's database and image storage paths in 0.4.0.
-      environment =
-        if is03 then {
-          PICTRS__PATH = cfg.dataDir;
-          PICTRS__ADDR = "${cfg.address}:${toString cfg.port}";
-        } else {
-          PICTRS__REPO__PATH = if cfg.repoPath != null then cfg.repoPath else "${cfg.dataDir}/sled-repo";
-          PICTRS__STORE__PATH = if cfg.storePath != null then cfg.storePath else "${cfg.dataDir}/files";
-          PICTRS__SERVER__ADDR = "${cfg.address}:${toString cfg.port}";
-        };
+      environment = {
+        PICTRS__REPO__PATH = if cfg.repoPath != null then cfg.repoPath else "${cfg.dataDir}/sled-repo";
+        PICTRS__STORE__PATH = if cfg.storePath != null then cfg.storePath else "${cfg.dataDir}/files";
+        PICTRS__SERVER__ADDRESS = "${cfg.address}:${toString cfg.port}";
+      };
       wantedBy = [ "multi-user.target" ];
       serviceConfig = {
         DynamicUser = true;
         StateDirectory = "pict-rs";
-        ExecStart = if is03 then "${lib.getBin cfg.package}/bin/pict-rs" else "${lib.getBin cfg.package}/bin/pict-rs run";
+        ExecStart = "${lib.getBin cfg.package}/bin/pict-rs run";
       };
     };
   };
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index d5218e2007ac..9194ba9b4c88 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1156,6 +1156,7 @@ mapAliases ({
   picom-allusive = throw "picom-allusive was renamed to compfy and is being abandoned by upstream"; # Added 2024-02-13
   picom-jonaburg = throw "picom-jonaburg was removed because it is unmaintained by upstream"; # Added 2024-02-13
   picom-next = picom; # Added 2024-02-13
+  pict-rs_0_3 = throw "pict-rs_0_3 has been removed, as it was an outdated version and no longer compiled"; # Added 2024-08-20
 
   # Obsolete PHP version aliases
   php80 = throw "php80 has been dropped due to the lack of maintenance from upstream for future releases"; # Added 2023-06-21
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 332c77932d02..8f04392e8400 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -25381,11 +25381,6 @@ with pkgs;
 
   pict-rs = callPackage ../servers/web-apps/pict-rs { };
 
-  pict-rs_0_3 = callPackage ../servers/web-apps/pict-rs/0.3.nix {
-    inherit (darwin.apple_sdk.frameworks) Security;
-    ffmpeg = ffmpeg_4;
-  };
-
   popa3d = callPackage ../servers/mail/popa3d { };
 
   postfix = callPackage ../servers/mail/postfix { };