diff --git a/Dockerfile b/Dockerfile
index 0cdd2e4e..d84e057e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ FROM alpine:3.16
 
 LABEL org.opencontainers.image.source https://github.com/helmfile/helmfile
 
-RUN apk add --no-cache ca-certificates git bash curl jq openssh-client
+RUN apk add --no-cache ca-certificates git bash curl jq openssh-client gnupg
 
 # Set Helm home variables so that also non-root users can use plugins etc.
 ARG HOME="/helm"
diff --git a/Dockerfile.debian-stable-slim b/Dockerfile.debian-stable-slim
index 28b863b2..1ba90d34 100644
--- a/Dockerfile.debian-stable-slim
+++ b/Dockerfile.debian-stable-slim
@@ -18,6 +18,7 @@ LABEL org.opencontainers.image.source https://github.com/helmfile/helmfile
 RUN apt update -qq && \
     apt install --no-install-recommends -y \
       ca-certificates \
+      gnupg \
       git bash curl jq wget openssh-client && \
     rm -rf /var/lib/apt/lists/*
 
diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index d1085a21..33437549 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -18,6 +18,7 @@ LABEL org.opencontainers.image.source https://github.com/helmfile/helmfile
 RUN apt update -qq && \
     apt install --no-install-recommends -y \
       ca-certificates \
+      gnupg \
       git bash curl jq wget openssh-client && \
     rm -rf /var/lib/apt/lists/*