diff --git a/tools/hashing-tool/Dockerfile b/tools/hashing-tool/Dockerfile
index f3b2d94e..802bcd9c 100644
--- a/tools/hashing-tool/Dockerfile
+++ b/tools/hashing-tool/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext
diff --git a/tools/reverse-proxy/Dockerfile b/tools/reverse-proxy/Dockerfile
index 653190e5..2e56d876 100644
--- a/tools/reverse-proxy/Dockerfile
+++ b/tools/reverse-proxy/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Upgrade base Alpine packages to latest security builds (openssl/libssl3/libcrypto3, musl, zlib, libxml2, libexpat, nghttp2)
 RUN apk upgrade --no-cache
diff --git a/web-integrations/google-secure-signals/client-side/Dockerfile b/web-integrations/google-secure-signals/client-side/Dockerfile
index dbd5db07..a62e5b55 100644
--- a/web-integrations/google-secure-signals/client-side/Dockerfile
+++ b/web-integrations/google-secure-signals/client-side/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext
diff --git a/web-integrations/javascript-sdk/client-side/Dockerfile b/web-integrations/javascript-sdk/client-side/Dockerfile
index d4ff034f..1e57b5b3 100644
--- a/web-integrations/javascript-sdk/client-side/Dockerfile
+++ b/web-integrations/javascript-sdk/client-side/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext
diff --git a/web-integrations/prebid-integrations/client-side-deferred/Dockerfile b/web-integrations/prebid-integrations/client-side-deferred/Dockerfile
index 6e9a4d65..4d35dc16 100644
--- a/web-integrations/prebid-integrations/client-side-deferred/Dockerfile
+++ b/web-integrations/prebid-integrations/client-side-deferred/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext
diff --git a/web-integrations/prebid-integrations/client-side/Dockerfile b/web-integrations/prebid-integrations/client-side/Dockerfile
index 7b2e9eef..e26dd231 100644
--- a/web-integrations/prebid-integrations/client-side/Dockerfile
+++ b/web-integrations/prebid-integrations/client-side/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext
diff --git a/web-integrations/prebid-secure-signals/client-side/Dockerfile b/web-integrations/prebid-secure-signals/client-side/Dockerfile
index d31f195b..ca3c5ce7 100644
--- a/web-integrations/prebid-secure-signals/client-side/Dockerfile
+++ b/web-integrations/prebid-secure-signals/client-side/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:alpine-slim
 
 # Install gettext for envsubst
 RUN apk add --no-cache gettext