diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9fdf2d52800d02e283ace15ba8063e28e5c85127..b3aad3e54bc99f655decaefcb9bc1ff359e697ac 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -22,7 +22,7 @@ image: gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/infrastructure/ci-dock
 
 build:worker:
   stage: build
-  image: gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/webui-client/core-snapshot:0.0.0.r1520.g1b02620e2
+  image: gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/webui-client/core-snapshot:0.0.0.r1523.ge38a6578e
   before_script:
     - apk add --no-cache curl && curl https://alt.fit.cvut.cz/repo/alpine/alt-dev-repo.sh | sh
     - apk add --no-cache build-base cmake jsoncpp-dev pkgconf apr-dev spdlog-dev catch2 activemq-cpp-dev argparse boost-dev
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71be54304c44e6a473997177446a27f004f34f1d..75aef989bbcde0ef66fac69ae67ef515a85a0728 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 ### Added
 ### Changed
+- Bump [core] version to ref [e38a6578eca11b18a0fbe5802e5d9f110d2c38d8](https://gitlab.fit.cvut.cz/algorithms-library-toolkit/automata-library/commit/e38a6578eca11b18a0fbe5802e5d9f110d2c38d8).
 
 ## [0.4.0] - 2021-05-14
 ### Added
diff --git a/worker/Dockerfile b/worker/Dockerfile
index f461fbcd3f98236bed23b70c27ce9caf8c4d5328..23ea5985ebdc911c8f9815a8c51de0a76b98be72 100644
--- a/worker/Dockerfile
+++ b/worker/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/webui-client/core-snapshot:0.0.0.r1520.g1b02620e2
+ARG BASE_IMAGE=gitlab.fit.cvut.cz:5000/algorithms-library-toolkit/webui-client/core-snapshot:0.0.0.r1523.ge38a6578e
 
 #-----------------------------------------------------------------------------------------