diff --git a/Makefile b/Makefile
index 9291c448657..5192d2c5a6b 100644
--- a/Makefile
+++ b/Makefile
@@ -96,6 +96,11 @@ else
 	endif
 endif
 
+# if version = "main" then update version to "nightly"
+ifeq ($(VERSION),main)
+	VERSION := main-nightly
+endif
+
 LDFLAGS := $(LDFLAGS) -X "main.MakeVersion=$(MAKE_VERSION)" -X "main.Version=$(GITEA_VERSION)" -X "main.Tags=$(TAGS)"
 
 LINUX_ARCHS ?= linux/amd64,linux/386,linux/arm-5,linux/arm-6,linux/arm64
diff --git a/docker/manifest.rootless.tmpl b/docker/manifest.rootless.tmpl
index ef48dd1684b..87e6e9dfc2b 100644
--- a/docker/manifest.rootless.tmpl
+++ b/docker/manifest.rootless.tmpl
@@ -1,4 +1,4 @@
-image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}-rootless
+image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}-rootless
 {{#if build.tags}}
 {{#unless (contains "-rc" build.tag)}}
 tags:
@@ -10,12 +10,12 @@ tags:
 {{/if}}
 manifests:
   -
-    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}-linux-amd64-rootless
+    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}-linux-amd64-rootless
     platform:
       architecture: amd64
       os: linux
   -
-    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}-linux-arm64-rootless
+    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}-linux-arm64-rootless
     platform:
       architecture: arm64
       os: linux
diff --git a/docker/manifest.tmpl b/docker/manifest.tmpl
index 018d87e9796..18847064f62 100644
--- a/docker/manifest.tmpl
+++ b/docker/manifest.tmpl
@@ -1,4 +1,4 @@
-image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}
+image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}
 {{#if build.tags}}
 {{#unless (contains "-rc" build.tag)}}
 tags:
@@ -10,12 +10,12 @@ tags:
 {{/if}}
 manifests:
   -
-    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}-linux-amd64
+    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}-linux-amd64
     platform:
       architecture: amd64
       os: linux
   -
-    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}dev{{/if}}-linux-arm64
+    image: gitea/gitea:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}{{#if (hasPrefix "refs/heads/release/v" build.ref)}}{{trimPrefix "refs/heads/release/v" build.ref}}-{{/if}}nightly{{/if}}-linux-arm64
     platform:
       architecture: arm64
       os: linux