Docker 29 increased minimum API version, breaks Traefik reverse proxy

meyay · November 11, 2025, 8:00pm

Judging by the sources, the docker-java dependency in version 3.5.1 should already support api-version 1.44:

docker-java-core/src/main/java/com/github/dockerjava/core/RemoteApiVersion.java

3.5.1


      
          public static final RemoteApiVersion VERSION_1_33 = RemoteApiVersion.create(1, 33);
          public static final RemoteApiVersion VERSION_1_34 = RemoteApiVersion.create(1, 34);
          public static final RemoteApiVersion VERSION_1_35 = RemoteApiVersion.create(1, 35);
          public static final RemoteApiVersion VERSION_1_36 = RemoteApiVersion.create(1, 36);
          public static final RemoteApiVersion VERSION_1_37 = RemoteApiVersion.create(1, 37);
          public static final RemoteApiVersion VERSION_1_38 = RemoteApiVersion.create(1, 38);
          public static final RemoteApiVersion VERSION_1_40 = RemoteApiVersion.create(1, 40);
          public static final RemoteApiVersion VERSION_1_41 = RemoteApiVersion.create(1, 41);
          public static final RemoteApiVersion VERSION_1_42 = RemoteApiVersion.create(1, 42);
          public static final RemoteApiVersion VERSION_1_43 = RemoteApiVersion.create(1, 43);
          public static final RemoteApiVersion VERSION_1_44 = RemoteApiVersion.create(1, 44);
          
          
          /**
           * Unknown, docker doesn't reflect reality. I.e. we implemented method, but for javadoc it not clear when it was added.
           */
          public static final RemoteApiVersion UNKNOWN_VERSION = new RemoteApiVersion(0, 0) {
          
              @Override
              public boolean isGreaterOrEqual(final RemoteApiVersion other) {
                  return false;

The solution for you might be as easy, as setting api.versionin the docker-java.properties:
https://github.com/docker-java/docker-java/blob/main/docs/getting_started.md#properties-docker-javaproperties

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Docker 29 increased minimum API version, breaks Traefik reverse proxy

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