I can't import the containsString CoreMatcher from hamcrest

Question

I'm trying to do the following:

import static org.hamcrest.CoreMatchers.containsString

assertThat(myvar, containsString("string to check"))

Here are my dependencies. I need to support junit 4 and junit 5

  testCompile('org.mockito:mockito-all:+')
  testCompile('org.mockito:mockito-inline:+')
  // use junpiter
  testImplementation(platform('org.junit:junit-bom:+'))
  testImplementation('org.junit.jupiter:junit-jupiter')
  testImplementation('org.junit.jupiter:junit-jupiter-params')
  // AND junit 4 because I use a test framework that has a hard dependency on junit 4
  testImplementation("junit:junit:4.13")
  testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.7.2")
  // Trying to pull in latest hamcrest
  testImplementation('org.hamcrest:hamcrest:2.2')

The problem is in my class when I to import static org.hamcrest.CoreMatchers.containsString It appears to be using hamcrest 1.3 which does not have "containsString". Is it using 1.3 because junit 4 depends on this version of hamcrest?

Is what I'm trying to do impossible because I'm pulling in both junit 4 and jupiter?

EDIT

In my editor it says it does not exist:

Using my IDE I can read its docs on my localhost: (http://localhost:63342/..../hamcrest-core-1.3-javadoc.jar/org/hamcrest/CoreMatchers.html)

When trying to run it I get this error

No signature of method: src.myproject.MyClassTest.containsString() is applicable for argument types: (String) values: [string to check]
groovy.lang.MissingMethodException: No signature of method: src.myproject.MyClassTest.containsString() ....

Per comments I can see now it looks like its using CoreMatchers from mockito for some reason:

EDIT Solution

Per comments the issue was that CoreMatchers was coming from mockito. I have removed mockito as a dependency and deleted its jars and that fixed it.

But I still don't understand how/why this was happening. I hope a proper answer to my question will include an explanation of why CoreMatchers was being fetched from the wrong place.