diff --git a/.drone.yml b/.drone.yml
index c340edb..67bc366 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -9,11 +9,11 @@ platform:
 
 steps:
 - name: prepare workspace
-  image: alpine
+  image: alpine:3.21
   commands:
   - rm -fr build_dir
 - name: build hermes
-  image: alpine
+  image: alpine:3.21
   commands:
   - apk add -t hermes-build-deps --no-cache graphviz doxygen gcc make openssl-dev libspf2-dev cmake g++ sqlite-dev gettext-dev python3 boost-dev fmt-dev
   - cmake -B build_dir -D BUILD_DOCS=ON
@@ -35,11 +35,11 @@ platform:
 
 steps:
 - name: prepare workspace
-  image: alpine
+  image: alpine:3.21
   commands:
   - rm -fr build_dir
 - name: build hermes
-  image: alpine
+  image: alpine:3.21
   commands:
   - apk add -t hermes-build-deps --no-cache graphviz doxygen gcc make openssl-dev libspf2-dev cmake g++ sqlite-dev gettext-dev python3 boost-dev fmt-dev
   - cmake -B build_dir
diff --git a/Dockerfile b/Dockerfile
index f343e6b..e4a1771 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,14 @@
-FROM alpine:3.18
+FROM alpine:3.21
 ADD . /hermes
 WORKDIR /hermes
-RUN apk add --no-cache graphviz doxygen gcc make openssl-dev libspf2-dev cmake g++ sqlite-dev gettext-dev python3 boost-dev fmt-dev
+RUN apk add --no-cache graphviz doxygen gcc make openssl-dev libspf2-dev cmake g++ sqlite-dev gettext-dev python3 boost-dev fmt
 RUN cmake -B build
 RUN cmake --build build
 RUN mkdir /hermes-installation
 RUN cmake --install build --prefix /hermes-installation
 
-FROM alpine:3.18
+FROM alpine:3.21
 EXPOSE 25
 COPY --from=0 /hermes-installation /hermes
-RUN apk add --no-cache openssl libspf2 sqlite-libs libstdc++ libgcc fmt
+RUN apk add --no-cache openssl libspf2 sqlite-libs libstdc++ libgcc
 CMD ["/hermes/bin/hermes", "/config/hermesrc"]