diff --git a/Dockerfile b/Dockerfile
index 6032bda..cb9e1be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/linuxserver/baseimage-alpine:3.14 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:3.15 as buildstage
 
 # build variables
 ARG SYNCTHING_RELEASE
@@ -36,7 +36,7 @@ echo "**** fetch source code ****" && \
 	build syncthing
 
 ############## runtime stage ##############
-FROM ghcr.io/linuxserver/baseimage-alpine:3.14
+FROM ghcr.io/linuxserver/baseimage-alpine:3.15
 
 # set version label
 ARG BUILD_DATE
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index a6d1646..560a84b 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,4 +1,4 @@
-FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.14 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.15 as buildstage
 
 # build variables
 ARG SYNCTHING_RELEASE
@@ -36,7 +36,7 @@ echo "**** fetch source code ****" && \
 	build syncthing
 
 ############## runtime stage ##############
-FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.14
+FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.15
 
 # set version label
 ARG BUILD_DATE
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 66d494d..d89e020 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -1,4 +1,4 @@
-FROM ghcr.io/linuxserver/baseimage-alpine:arm32v7-3.14 as buildstage
+FROM ghcr.io/linuxserver/baseimage-alpine:arm32v7-3.15 as buildstage
 
 # build variables
 ARG SYNCTHING_RELEASE
@@ -36,7 +36,7 @@ echo "**** fetch source code ****" && \
 	build syncthing
 
 ############## runtime stage ##############
-FROM ghcr.io/linuxserver/baseimage-alpine:arm32v7-3.14
+FROM ghcr.io/linuxserver/baseimage-alpine:arm32v7-3.15
 
 # set version label
 ARG BUILD_DATE
diff --git a/README.md b/README.md
index 576d0d3..f6677c6 100644
--- a/README.md
+++ b/README.md
@@ -239,6 +239,7 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **03.05.21:** - Rebase to alpine 3.15.
 * **05.10.21:** - Rebase to alpine 3.14.
 * **12.05.21:** - Remove sysctl parameter again
 * **03.05.21:** - Raise maximum UDP buffer size.
diff --git a/readme-vars.yml b/readme-vars.yml
index 8662e61..665f039 100755
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -43,6 +43,7 @@ app_setup_nginx_reverse_proxy_block: ""
 # changelog
 
 changelogs:
+  - { date: "03.05.21:", desc: "Rebase to alpine 3.15." }
   - { date: "05.10.21:", desc: "Rebase to alpine 3.14." }
   - { date: "12.05.21:", desc: "Remove sysctl parameter again" }
   - { date: "03.05.21:", desc: "Raise maximum UDP buffer size." }