diff --git a/pkgs/applications/networking/cluster/fluxcd/default.nix b/pkgs/applications/networking/cluster/fluxcd/default.nix
index 709ab087d26a..3f3b08f39814 100644
--- a/pkgs/applications/networking/cluster/fluxcd/default.nix
+++ b/pkgs/applications/networking/cluster/fluxcd/default.nix
@@ -8,8 +8,8 @@
 
 let
   version = "2.2.3";
-  sha256 = "12rrai56hl86213lsi8i4qrah0v7a36nks38g5373imyl9g497ym";
-  manifestsSha256 = "1hmzmzijpx49hh2ykv7vw3jp02dxr4qn3r1dma56g7b4nbk7aa8x";
+  sha256 = "sha256-1Z9EXqK+xnFGeWjoac1QZwOoMiYRRU1HEAZRaEpUOYs=";
+  manifestsSha256 = "sha256-HSl15rJknWeKqi3kYTHJvQlw5eD77OkFhIn0K+Ovv8I=";
 
   manifests = fetchzip {
     url =
diff --git a/pkgs/applications/networking/cluster/fluxcd/update.sh b/pkgs/applications/networking/cluster/fluxcd/update.sh
index f252d587daaf..1763b37d3328 100755
--- a/pkgs/applications/networking/cluster/fluxcd/update.sh
+++ b/pkgs/applications/networking/cluster/fluxcd/update.sh
@@ -12,7 +12,9 @@ LATEST_VERSION=$(echo ${LATEST_TAG} | sed 's/^v//')
 
 if [ ! "$OLD_VERSION" = "$LATEST_VERSION" ]; then
     SHA256=$(nix-prefetch-url --quiet --unpack https://github.com/fluxcd/flux2/archive/refs/tags/${LATEST_TAG}.tar.gz)
+    SHA256=$(nix hash to-sri --type sha256 $SHA256)
     SPEC_SHA256=$(nix-prefetch-url --quiet --unpack https://github.com/fluxcd/flux2/releases/download/${LATEST_TAG}/manifests.tar.gz)
+    SPEC_SHA256=$(nix hash to-sri --type sha256 $SPEC_SHA256)
 
     setKV () {
         sed -i "s|$1 = \".*\"|$1 = \"${2:-}\"|" "${FLUXCD_PATH}/default.nix"