diff --git a/CHANGE-NOTES.md b/CHANGE-NOTES.md
index ceba45ae6..a99ed53b8 100644
--- a/CHANGE-NOTES.md
+++ b/CHANGE-NOTES.md
@@ -1,6 +1,7 @@
 # Changelog
 
 ## v5.1.1
+- Fixed: compatibility issues with latest 2024.3 EAPs
 
 ## v5.1.0
 - Added: support for IntelliJ 2024.3.
diff --git a/frontend/actions/src/main/java/com/virtuslab/gitmachete/frontend/actions/base/BaseSlideInBelowAction.java b/frontend/actions/src/main/java/com/virtuslab/gitmachete/frontend/actions/base/BaseSlideInBelowAction.java
index f2b23a6f7..e303e3b37 100644
--- a/frontend/actions/src/main/java/com/virtuslab/gitmachete/frontend/actions/base/BaseSlideInBelowAction.java
+++ b/frontend/actions/src/main/java/com/virtuslab/gitmachete/frontend/actions/base/BaseSlideInBelowAction.java
@@ -7,12 +7,14 @@
 import static com.virtuslab.gitmachete.frontend.resourcebundles.GitMacheteBundle.getString;
 import static org.apache.commons.text.StringEscapeUtils.escapeHtml4;
 
+import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Collections;
 
 import com.intellij.openapi.actionSystem.AnActionEvent;
 import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vcs.VcsNotifier;
 import git4idea.GitRemoteBranch;
 import git4idea.branch.GitNewBranchOptions;
@@ -157,6 +159,7 @@ public void actionPerformed(AnActionEvent anActionEvent) {
   }
 
   @ContinuesInBackground
+  @SuppressWarnings("KotlinInternalInJava")
   private Tuple2<@Nullable String, UiThreadUnsafeRunnable> getBranchNameAndPreSlideInRunnable(
       GitRepository gitRepository,
       String startPoint,
@@ -188,7 +191,26 @@ public void actionPerformed(AnActionEvent anActionEvent) {
 
     if (remoteBranch == null) {
       return Tuple.of(branchName, () -> {
-        val gitBranchCheckoutOperation = new GitBranchCheckoutOperation(project, Collections.singletonList(gitRepository));
+        // TODO (#1938): replace with a non-reflective call once 2024.2 is no longer supported
+        Constructor constructor;
+        try {
+          // Since 243.19420.21-EAP-SNAPSHOT
+          constructor = GitBranchCheckoutOperation.class.getConstructor(Project.class, java.util.Collection.class);
+        } catch (NoSuchMethodException e) {
+          try {
+            // Before 243.19420.21-EAP-SNAPSHOT
+            constructor = GitBranchCheckoutOperation.class.getConstructor(Project.class, java.util.List.class);
+          } catch (NoSuchMethodException e1) {
+            throw new RuntimeException(e1);
+          }
+        }
+        GitBranchCheckoutOperation gitBranchCheckoutOperation;
+        try {
+          gitBranchCheckoutOperation = (GitBranchCheckoutOperation) constructor.newInstance(project,
+              Collections.singletonList(gitRepository));
+        } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
+          throw new RuntimeException(e);
+        }
         val git4IdeaOptions = options.toGit4IdeaOptions();
         try {
           // Since 233.10527.20-EAP-SNAPSHOT
@@ -202,8 +224,8 @@ public void actionPerformed(AnActionEvent anActionEvent) {
             throw new RuntimeException(e);
           }
         } catch (NoSuchMethodException e) {
-          // Before 233.10527.20-EAP-SNAPSHOT
           try {
+            // Before 233.10527.20-EAP-SNAPSHOT
             Method perform = GitBranchCheckoutOperation.class.getDeclaredMethod("perform", String.class,
                 GitNewBranchOptions.class);
             perform.invoke(gitBranchCheckoutOperation, startPoint, git4IdeaOptions);
diff --git a/intellij-versions.properties b/intellij-versions.properties
index 105e66649..aeb526b41 100644
--- a/intellij-versions.properties
+++ b/intellij-versions.properties
@@ -1,4 +1,4 @@
-eapOfLatestSupportedMajor=243.18137.10-EAP-SNAPSHOT
+eapOfLatestSupportedMajor=243.19420.21-EAP-SNAPSHOT
 earliestSupportedMajor=2022.3
 earliestSupportedMajorKotlinVersion=1.7
 latestMinorsOfOldSupportedMajors=2022.3.3,2023.1.7,2023.2.8,2023.3.8,2024.1.6
diff --git a/src/test/java/com/virtuslab/archunit/UIThreadUnsafeMethodInvocationsTestSuite.java b/src/test/java/com/virtuslab/archunit/UIThreadUnsafeMethodInvocationsTestSuite.java
index 0bc8460bb..b3eb5a47a 100644
--- a/src/test/java/com/virtuslab/archunit/UIThreadUnsafeMethodInvocationsTestSuite.java
+++ b/src/test/java/com/virtuslab/archunit/UIThreadUnsafeMethodInvocationsTestSuite.java
@@ -144,7 +144,7 @@ public void only_ui_thread_unsafe_code_units_should_call_other_ui_thread_unsafe_
       "git4idea.ui.ComboBoxWithAutoCompletion.setPlaceholder(java.lang.String)",
       "git4idea.ui.ComboBoxWithAutoCompletion.setPrototypeDisplayValue(java.lang.Object)",
       "git4idea.ui.ComboBoxWithAutoCompletion.setUI(javax.swing.plaf.ComboBoxUI)",
-      "git4idea.ui.branch.GitBranchCheckoutOperation.<init>(com.intellij.openapi.project.Project, java.util.List)",
+      "git4idea.ui.branch.GitBranchCheckoutOperation.<init>(com.intellij.openapi.project.Project, java.util.Collection)",
       "git4idea.validators.GitBranchValidatorKt.checkRefName(java.lang.String)",
       "git4idea.validators.GitBranchValidatorKt.checkRefNameEmptyOrHead(java.lang.String)",
       "git4idea.validators.GitBranchValidatorKt.conflictsWithLocalBranch(java.util.Collection, java.lang.String)",