diff --git a/hack/update-copyright-year.sh b/hack/update-copyright-year.sh
index cde6561c2..9002475b7 100755
--- a/hack/update-copyright-year.sh
+++ b/hack/update-copyright-year.sh
@@ -1,15 +1,10 @@
 #!/bin/bash
 
-# Copyright 2021-2024 the Pinniped contributors. All Rights Reserved.
+# Copyright 2021-2026 the Pinniped contributors. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
 
-if [[ "$OSTYPE" != "darwin"* ]]; then
-  echo "This script was only written for MacOS (due to differences with Linux sed flags)"
-  exit 1
-fi
-
 files=$(git diff --cached --name-only)
 year=$(date +"%Y")
 
@@ -29,10 +24,19 @@ if [[ "${#missing_copyright_files[@]}" -gt "0" ]]; then
         echo "    $f"
         # The rule when updating copyrights is to always keep the starting year,
         # and to replace the ending year with the current year.
-        # This uses MacOS sed flags to replace "XXXX-YYYY" with "XXXX-year" in the copyright notice.
-        sed -E -e 's/Copyright ([0-9]{4})-([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i '' "$f"
-        # This uses MacOS sed flags to replace "XXXX" with "XXXX-year" in the copyright notice.
-        sed -E -e 's/Copyright ([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i '' "$f"
+        if [[ "$(uname -s)" == "Linux" ]]; then
+          # sed on Linux uses -i'' (no space in between).
+          # Replace "XXXX-YYYY" with "XXXX-year" in the copyright notice.
+          sed -E -e 's/Copyright ([0-9]{4})-([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i'' "$f"
+          # Replace "XXXX" with "XXXX-year" in the copyright notice.
+          sed -E -e 's/Copyright ([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i'' "$f"
+        else
+          # sed on MacOS uses -i '' (with space in between).
+          # Replace "XXXX-YYYY" with "XXXX-year" in the copyright notice.
+          sed -E -e 's/Copyright ([0-9]{4})-([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i '' "$f"
+          # Replace "XXXX" with "XXXX-year" in the copyright notice.
+          sed -E -e 's/Copyright ([0-9]{4}) the Pinniped contributors/Copyright \1-'"$year"' the Pinniped contributors/' -i '' "$f"
+        fi
     done
     echo "Done!"
     exit 1
diff --git a/hack/update-go-mod/update-majors.sh b/hack/update-go-mod/update-majors.sh
index 7e0038dc5..bfd7e8f1f 100755
--- a/hack/update-go-mod/update-majors.sh
+++ b/hack/update-go-mod/update-majors.sh
@@ -36,10 +36,19 @@ for m in $modules; do
   found_new_version=$?
   if [[ $found_new_version == 0 ]]; then
     echo "Found new version $next_version. Replacing imports..."
-    find . -wholename './.*' -prune -o \
-      -path ./generated -prune -o \
-      -type f -name '*.go' -print0 |
-      xargs -0 sed -i '' "s#${m}#${next_version}#g"
+    if [[ "$(uname -s)" == "Linux" ]]; then
+      # sed on Linux uses -i'' (no space in between).
+      find . -wholename './.*' -prune -o \
+        -path ./generated -prune -o \
+        -type f -name '*.go' -print0 |
+        xargs -0 sed -i'' "s#${m}#${next_version}#g"
+    else
+      # sed on MacOS uses -i '' (with space in between).
+      find . -wholename './.*' -prune -o \
+        -path ./generated -prune -o \
+        -type f -name '*.go' -print0 |
+        xargs -0 sed -i '' "s#${m}#${next_version}#g"
+    fi
   fi
   set -e
 done