diff --git a/Dockerfile b/Dockerfile
index 9a01ae972..bffb2cad8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,9 +7,6 @@ ENV \
     CRYPTOGRAPHY_OPENSSL_NO_LEGACY=1 \
     UV_SYSTEM_PYTHON=true
 
-ARG \
-    COSIGN_VERSION
-
 # Install base
 WORKDIR /usr/src
 RUN \
@@ -25,8 +22,6 @@ RUN \
         openssl \
         yaml \
     \
-    && curl -Lso /usr/bin/cosign "https://github.com/home-assistant/cosign/releases/download/${COSIGN_VERSION}/cosign_${BUILD_ARCH}" \
-    && chmod a+x /usr/bin/cosign \
     && pip3 install uv==0.9.18
 
 # Install requirements
diff --git a/build.yaml b/build.yaml
index bd2816eba..74ae80e19 100644
--- a/build.yaml
+++ b/build.yaml
@@ -5,8 +5,6 @@ build_from:
 cosign:
   base_identity: https://github.com/home-assistant/docker-base/.*
   identity: https://github.com/home-assistant/supervisor/.*
-args:
-  COSIGN_VERSION: 2.5.3
 labels:
   io.hass.type: supervisor
   org.opencontainers.image.title: Home Assistant Supervisor