diff --git a/compose.dev.yml b/compose.dev.yml
index 595ecb6..df09443 100644
--- a/compose.dev.yml
+++ b/compose.dev.yml
@@ -1,7 +1,7 @@
 services:
   postgis:
     container_name: postgis
-    image: docker.io/postgis/postgis:18-3.6-alpine
+    image: docker.io/postgis/postgis:18-3.6-alpine@sha256:dcf34bd8039aa4426eb5169c03867b82988e893e38809b3134fc2e405792c8c5
     ports:
       - 5432:5432
     environment: