diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 789767119fd..072e5b91ba6 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -400,12 +400,14 @@ mv --no-target-directory "$OUTDIR" "$ACTUAL_OUTDIR" \
     || ( rm -rf "$ACTUAL_OUTDIR" && exit 1 )
 
 (
+    tmp="$(mktemp)"
     cd /outdir-base
     {
         echo "$GIT_ARCHIVE"
         find "$ACTUAL_OUTDIR" -type f
     } | xargs realpath --relative-base="$PWD" \
-      | xargs sha256sum \
-      | sort -k2 \
-      | sponge "$ACTUAL_OUTDIR"/SHA256SUMS.part
+        | xargs sha256sum \
+        | sort -k2 \
+        > "$tmp";
+    mv "$tmp" "$ACTUAL_OUTDIR"/SHA256SUMS.part
 )
diff --git a/contrib/guix/libexec/codesign.sh b/contrib/guix/libexec/codesign.sh
index 9ea683b9fa9..9b7f085d3ab 100755
--- a/contrib/guix/libexec/codesign.sh
+++ b/contrib/guix/libexec/codesign.sh
@@ -141,6 +141,7 @@ mv --no-target-directory "$OUTDIR" "$ACTUAL_OUTDIR" \
     || ( rm -rf "$ACTUAL_OUTDIR" && exit 1 )
 
 (
+    tmp="$(mktemp)"
     cd /outdir-base
     {
         echo "$CODESIGNING_TARBALL"
@@ -149,5 +150,6 @@ mv --no-target-directory "$OUTDIR" "$ACTUAL_OUTDIR" \
     } | xargs realpath --relative-base="$PWD" \
         | xargs sha256sum \
         | sort -k2 \
-        | sponge "$ACTUAL_OUTDIR"/SHA256SUMS.part
+        > "$tmp";
+    mv "$tmp" "$ACTUAL_OUTDIR"/SHA256SUMS.part
 )
diff --git a/contrib/guix/manifest.scm b/contrib/guix/manifest.scm
index ea1ffe5d983..9cadd410537 100644
--- a/contrib/guix/manifest.scm
+++ b/contrib/guix/manifest.scm
@@ -521,36 +521,6 @@ inspecting signatures in Mach-O binaries.")
                    (("^install-others =.*$")
                     (string-append "install-others = " out "/etc/rpc\n")))))))))))))
 
-;; The sponge tool from moreutils.
-(define-public sponge
-  (package
-    (name "sponge")
-    (version "0.69")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "https://git.joeyh.name/index.cgi/moreutils.git/snapshot/
-                    moreutils-" version ".tar.gz"))
-              (file-name (string-append "moreutils-" version ".tar.gz"))
-              (sha256
-               (base32
-                "1l859qnzccslvxlh5ghn863bkq2vgmqgnik6jr21b9kc6ljmsy8g"))))
-    (build-system gnu-build-system)
-    (arguments
-     (list #:phases
-           #~(modify-phases %standard-phases
-               (delete 'configure)
-               (replace 'install
-                (lambda* (#:key outputs #:allow-other-keys)
-                  (let ((bin (string-append (assoc-ref outputs "out") "/bin")))
-                  (install-file "sponge" bin)))))
-           #:make-flags
-           #~(list "sponge" (string-append "CC=" #$(cc-for-target)))))
-    (home-page "https://joeyh.name/code/moreutils/")
-    (synopsis "Miscellaneous general-purpose command-line tools")
-    (description "Just sponge")
-    (license license:gpl2+)))
-
 (packages->manifest
  (append
   (list ;; The Basics
@@ -565,7 +535,6 @@ inspecting signatures in Mach-O binaries.")
         patch
         gawk
         sed
-        sponge
         ;; Compression and archiving
         tar
         gzip