diff --git a/25/alpine/Dockerfile b/25/alpine/Dockerfile
index 54576f67..22266baa 100644
--- a/25/alpine/Dockerfile
+++ b/25/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV OTP_VERSION="25.3.2.13" \
     REBAR3_VERSION="3.24.0"
diff --git a/26/alpine/Dockerfile b/26/alpine/Dockerfile
index aa8e681e..b6ac714a 100644
--- a/26/alpine/Dockerfile
+++ b/26/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV OTP_VERSION="26.2.5.2" \
     REBAR3_VERSION="3.24.0"
diff --git a/27/alpine/Dockerfile b/27/alpine/Dockerfile
index 27f0b52c..e612d7b6 100644
--- a/27/alpine/Dockerfile
+++ b/27/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 ENV OTP_VERSION="27.1.2" \
     REBAR3_VERSION="3.24.0"