diff --git a/minimal-setup/keycloak/docker-compose.yml b/minimal-setup/keycloak/docker-compose.yml
index a2cfc9d..72f4cbb 100644
--- a/minimal-setup/keycloak/docker-compose.yml
+++ b/minimal-setup/keycloak/docker-compose.yml
@@ -104,7 +104,7 @@ services:
 #      ENABLE_KEYCLOAK_API_KEYS: "true"
 #      # to enable the permissions edition UI in OE2, you need to provide a KEYCLOAK_CLIENT_SECRET
 #      KEYCLOAK_CLIENT_SECRET: "change-me-I-am-a-secret-you-get-in-keycloak-logs"
-      KEYCLOAK_CLIENT_SECRET: "BW4jmAQXmnegXXDXKy7SPuStxSoPSG7M"
+      KEYCLOAK_CLIENT_SECRET: "qU5qhuToGyKHY4xKcUob5BUePwNBfSoH"
       PUBLIC_ORTHANC_ROOT: "http://localhost/orthanc/"
       PUBLIC_LANDING_ROOT: "http://localhost/orthanc/ui/app/token-landing.html"
       # to use OHIF-plugin:  make sure to use http://localhost/orthanc/ohif/
@@ -136,8 +136,10 @@ services:
     depends_on: [keycloak-db]
     restart: unless-stopped
     environment:
-      KEYCLOAK_ADMIN: "admin"
-      KEYCLOAK_ADMIN_PASSWORD: "change-me"
+      #KEYCLOAK_ADMIN: "admin"
+      #KEYCLOAK_ADMIN_PASSWORD: "change-me"
+      KC_BOOTSTRAP_ADMIN_USERNAME: "admin"
+      KC_BOOTSTRAP_ADMIN_PASSWORD: "change-me"
       KC_DB: "postgres"
       KC_DB_URL: "jdbc:postgresql://keycloak-db:5432/keycloak"
       KC_DB_USERNAME: "keycloak"
diff --git a/release-notes.md b/release-notes.md
index 581c5a5..735b032 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -8,6 +8,12 @@ v x.x.x
 ========
 
 - Upgraded OHIF from v3.9.0-beta.56 to v3.9.2
+- Upgraded Keycloak from 25.0.5 to 26.0.7
+
+BREAKING CHANGES:
+- Keycloak Docker image env var `KEYCLOAK_ADMIN` is replaced by `KC_BOOTSTRAP_ADMIN_USERNAME`
+- Keycloak Docker image env var `KEYCLOAK_ADMIN_PASSWORD` is replace by `KC_BOOTSTRAP_ADMIN_PASSWORD`
+
 
 v 24.11.0
 ========
diff --git a/sources/keycloak/Dockerfile.orthanc-keycloak b/sources/keycloak/Dockerfile.orthanc-keycloak
index 6585cb2..0916a47 100644
--- a/sources/keycloak/Dockerfile.orthanc-keycloak
+++ b/sources/keycloak/Dockerfile.orthanc-keycloak
@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: CC0-1.0
 
-FROM quay.io/keycloak/keycloak:25.0.5 AS builder
+FROM quay.io/keycloak/keycloak:26.0.7 AS builder
 
 WORKDIR /opt/keycloak
 ENV KC_DB=postgres
@@ -14,7 +14,7 @@ ADD keycloak/orthanc-theme /opt/keycloak/themes/orthanc
 
 RUN /opt/keycloak/bin/kc.sh build
 
-FROM quay.io/keycloak/keycloak:25.0.5
+FROM quay.io/keycloak/keycloak:26.0.7
 COPY --from=builder /opt/keycloak/ /opt/keycloak/
 
 COPY keycloak/realm-export.json /opt/keycloak/data/import/
diff --git a/sources/keycloak/orthanc-theme/login/theme.properties b/sources/keycloak/orthanc-theme/login/theme.properties
index 586939c..30ba51d 100644
--- a/sources/keycloak/orthanc-theme/login/theme.properties
+++ b/sources/keycloak/orthanc-theme/login/theme.properties
@@ -7,7 +7,7 @@ parent=base
 import=common/keycloak
 
 styles=css/login.css
-stylesCommon=node_modules/@patternfly/patternfly/patternfly.min.css node_modules/patternfly/dist/css/patternfly.min.css node_modules/patternfly/dist/css/patternfly-additions.min.css lib/pficon/pficon.css
+stylesCommon=vendor/patternfly-v4/patternfly.min.css vendor/patternfly-v3/css/patternfly.min.css vendor/patternfly-v3/css/patternfly-additions.min.css lib/pficon/pficon.css
 
 meta=viewport==width=device-width,initial-scale=1