diff --git a/update_api_docs.sh b/update_api_docs.sh
index 9a19b80f..549767bf 100755
--- a/update_api_docs.sh
+++ b/update_api_docs.sh
@@ -1,17 +1,37 @@
 #!/bin/bash
 
+SED_INPLACE=(-i)
+EXTRA_SED_ARGS=()
+
+if [ "$#" -gt 0 ]; then
+  SED_INPLACE=(-i "$1")
+  shift
+else
+  if sed --version >/dev/null 2>&1; then
+    SED_INPLACE=(-i)
+  else
+    SED_INPLACE=(-i '')
+  fi
+fi
+
+EXTRA_SED_ARGS=("$@")
+
+inplace_sed() {
+  sed "${SED_INPLACE[@]}" "${EXTRA_SED_ARGS[@]}" "$@"
+}
+
 curl --silent --output v1_json.tmpl https://raw.githubusercontent.com/go-gitea/gitea/refs/heads/main/templates/swagger/v1_json.tmpl
-sed -i "$@" 's|"version": "{{.SwaggerAppVer}}"|"version": "dev"|' v1_json.tmpl
-sed -i "$@" 's|"basePath": "{{.SwaggerAppSubUrl}}/api/v1"|"basePath": "https://gitea.com/api/v1"|' v1_json.tmpl
+inplace_sed 's|"version": "{{.SwaggerAppVer}}"|"version": "dev"|' v1_json.tmpl
+inplace_sed 's|"basePath": "{{.SwaggerAppSubUrl}}/api/v1"|"basePath": "https://gitea.com/api/v1"|' v1_json.tmpl
 mv v1_json.tmpl static/swagger-latest.json
 
 for ver in '1.25.1' '1.24.7' '1.23.8' '1.22.6'; do
   curl --silent --output v1_json.tmpl https://raw.githubusercontent.com/go-gitea/gitea/refs/tags/v${ver}/templates/swagger/v1_json.tmpl
-  sed -i "$@" "s|\"version\": \"{{.SwaggerAppVer}}\"|\"version\": \"${ver}\"|" v1_json.tmpl
-  sed -i "$@" 's|"basePath": "{{.SwaggerAppSubUrl}}/api/v1"|"basePath": "https://gitea.com/api/v1"|' v1_json.tmpl
+  inplace_sed "s|\"version\": \"{{.SwaggerAppVer}}\"|\"version\": \"${ver}\"|" v1_json.tmpl
+  inplace_sed 's|"basePath": "{{.SwaggerAppSubUrl}}/api/v1"|"basePath": "https://gitea.com/api/v1"|' v1_json.tmpl
   # for versions < 1.24
-  sed -i "$@" "s|\"version\": \"{{AppVer \| JSEscape}}\"|\"version\": \"${ver}\"|" v1_json.tmpl
-  sed -i "$@" 's\"basePath": "{{AppSubUrl | JSEscape}}/api/v1"\"basePath": "https://gitea.com/api/v1"\' v1_json.tmpl
+  inplace_sed "s|\"version\": \"{{AppVer \| JSEscape}}\"|\"version\": \"${ver}\"|" v1_json.tmpl
+  inplace_sed "s#\"basePath\": \"{{AppSubUrl | JSEscape}}/api/v1\"#\"basePath\": \"https://gitea.com/api/v1\"#" v1_json.tmpl
   minor=$(echo "$ver" | cut -d '.' -f 2)
   mv v1_json.tmpl static/swagger-$minor.json
 done