diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index e2c24740..62b8e35e 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -2,7 +2,7 @@ Thanks for submitting a pull request! Please ensure that you have based your cod
 
 - The current stable release branch for bugfixes of limited scope
 - The upcoming [minor](https://semver.org) release branch for backwards compatible changes to existing functionality or addition of new functionality
-- `master` for significant changes to existing behavior
+- `3.x` for significant changes to existing behavior
 
 If you're unsure which branch to use, open an [issue](https://github.com/FasterXML/jackson-module-kotlin/issues) and ask, we're happy to talk over proposed changes.
 
diff --git a/README.md b/README.md
index 373f9a77..dd0ac38a 100644
--- a/README.md
+++ b/README.md
@@ -190,7 +190,7 @@ when(root){
 # Configuration
 
 The Kotlin module may be given a few configuration parameters at construction time;
-see the [inline documentation](https://github.com/FasterXML/jackson-module-kotlin/blob/master/src/main/kotlin/tools/jackson/module/kotlin/KotlinModule.kt)
+see the [inline documentation](https://github.com/FasterXML/jackson-module-kotlin/blob/3.x/src/main/kotlin/tools/jackson/module/kotlin/KotlinModule.kt)
 for details on what options are available and what they do.
 
 ```kotlin
@@ -247,7 +247,7 @@ across all Jackson components & modules. See the [jackson-databind README](https
 
 We welcome any contributions—reports of issues, ideas for enhancements, and pull requests related to either of those.
 
-See the [main Jackson contribution guidelines](https://github.com/FasterXML/jackson/blob/master/CONTRIBUTING.md) for more details.
+See the [main Jackson contribution guidelines](https://github.com/FasterXML/jackson/blob/3.x/CONTRIBUTING.md) for more details.
 
 ### Branches
 
@@ -259,11 +259,11 @@ If you are going to write code, choose the appropriate base branch:
 
 ### Failing tests
 
-There are a number of tests for functionality that is broken, mostly in the [failing](https://github.com/FasterXML/jackson-module-kotlin/tree/master/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/failing)
+There are a number of tests for functionality that is broken, mostly in the [failing](https://github.com/FasterXML/jackson-module-kotlin/tree/3.x/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/failing)
 package but a few as part of other test suites.  Instead of ignoring these tests (with JUnit's `@Ignore` annotation)
 or excluding them from being run as part of automated testing, the tests are written to demonstrate the failure
 (either making a call that throws an exception or with an assertion that fails) but not fail the build, except if the
 underlying issue is fixed.  This allows us to know when the tested functionality has been incidentally fixed by
 unrelated code changes.
 
-See the [tests readme](https://github.com/FasterXML/jackson-module-kotlin/tree/master/src/test/kotlin/com/fasterxml/jackson/module/kotlin/README.md) for more information.
+See the [tests readme](https://github.com/FasterXML/jackson-module-kotlin/tree/3.x/src/test/kotlin/com/fasterxml/jackson/module/kotlin/README.md) for more information.