diff --git a/README.md b/README.md
index 269aa4999..0384c0582 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ scalatest_toolchain()
 ```
 
 This will load the `rules_scala` repository at the commit sha
-`rules_scala_version` into your Bazel project and register a [scala_toolchain](docs/scala_toolchain.md) at the default Scala version (2.12.19)
+`rules_scala_version` into your Bazel project and register a [scala_toolchain](docs/scala_toolchain.md) at the default Scala version (2.12.20)
 
 Then in your BUILD file just add the following so the rules will be available:
 ```starlark
@@ -143,13 +143,13 @@ Previous minor versions may work but are supported only on a best effort basis.
 To configure Scala version you must call `scala_config(scala_version = "2.xx.xx")` and configure 
 dependencies by declaring [scala_toolchain](docs/scala_toolchain.md). 
 For a quick start you can use `scala_repositories()` and `scala_register_toolchains()`, which have 
-dependency providers configured for `2.11.12`, `2.12.19` and `2.13.14` versions.
+dependency providers configured for `2.11.12`, `2.12.20` and `2.13.15` versions.
 
 
 ```starlark
 # WORKSPACE
 load("@io_bazel_rules_scala//:scala_config.bzl", "scala_config")
-scala_config(scala_version = "2.13.14")
+scala_config(scala_version = "2.13.15")
 
 load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
 rules_proto_dependencies()
diff --git a/dt_patches/dt_patch_test.sh b/dt_patches/dt_patch_test.sh
index 7bd9e89d9..bd1864787 100755
--- a/dt_patches/dt_patch_test.sh
+++ b/dt_patches/dt_patch_test.sh
@@ -102,6 +102,7 @@ run_test_local test_compiler_patch 2.12.16
 run_test_local test_compiler_patch 2.12.17
 run_test_local test_compiler_patch 2.12.18
 run_test_local test_compiler_patch 2.12.19
+run_test_local test_compiler_patch 2.12.20
 
 run_test_local test_compiler_patch 2.13.0
 run_test_local test_compiler_patch 2.13.1
@@ -116,6 +117,7 @@ run_test_local test_compiler_patch 2.13.10
 run_test_local test_compiler_patch 2.13.11
 run_test_local test_compiler_patch 2.13.12
 run_test_local test_compiler_patch 2.13.14
+run_test_local test_compiler_patch 2.13.15
 
 run_test_local test_compiler_srcjar_error 2.12.11
 run_test_local test_compiler_srcjar_error 2.12.12
@@ -129,7 +131,9 @@ run_test_local test_compiler_srcjar 2.12.16
 run_test_local test_compiler_srcjar_nonhermetic 2.12.17
 run_test_local test_compiler_srcjar_nonhermetic 2.12.18
 run_test_local test_compiler_srcjar_nonhermetic 2.12.19
+run_test_local test_compiler_srcjar_nonhermetic 2.12.20
 
 run_test_local test_compiler_srcjar_nonhermetic 2.13.11
 run_test_local test_compiler_srcjar_nonhermetic 2.13.12
-run_test_local test_compiler_srcjar_nonhermetic 2.13.14
\ No newline at end of file
+run_test_local test_compiler_srcjar_nonhermetic 2.13.14
+run_test_local test_compiler_srcjar_nonhermetic 2.13.15
\ No newline at end of file
diff --git a/dt_patches/test_dt_patches_user_srcjar/WORKSPACE b/dt_patches/test_dt_patches_user_srcjar/WORKSPACE
index ff0cb8f27..03517d2a0 100644
--- a/dt_patches/test_dt_patches_user_srcjar/WORKSPACE
+++ b/dt_patches/test_dt_patches_user_srcjar/WORKSPACE
@@ -105,6 +105,9 @@ srcjars_by_version = {
     "2.12.19": {
         "url": "https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.19/scala-compiler-2.12.19-sources.jar?foo",
     },
+    "2.12.20": {
+        "url": "https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.20/scala-compiler-2.12.20-sources.jar?foo",
+    },
     "2.13.11": {
         "url": "https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.11/scala-compiler-2.13.11-sources.jar?foo",
     },
@@ -114,6 +117,9 @@ srcjars_by_version = {
     "2.13.14": {
         "url": "https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.14/scala-compiler-2.13.14-sources.jar?foo",
     },
+    "2.13.15": {
+        "url": "https://repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.15/scala-compiler-2.13.15-sources.jar?foo",
+    },
 }
 
 rules_scala_setup(scala_compiler_srcjar = srcjars_by_version[SCALA_VERSION])
diff --git a/examples/crossbuild/1_single/BUILD b/examples/crossbuild/1_single/BUILD
index fba6ac698..b39f59706 100644
--- a/examples/crossbuild/1_single/BUILD
+++ b/examples/crossbuild/1_single/BUILD
@@ -14,7 +14,7 @@ scala_library(
 scala_test(
     name = "test213",
     srcs = ["test.scala"],
-    scala_version = "2.13.14",
+    scala_version = "2.13.15",
 )
 
 # This one will be compiled by 3.3 compiler (the default one):
diff --git a/examples/crossbuild/2_deps/BUILD b/examples/crossbuild/2_deps/BUILD
index b7ed66a2d..c39354498 100644
--- a/examples/crossbuild/2_deps/BUILD
+++ b/examples/crossbuild/2_deps/BUILD
@@ -19,7 +19,7 @@ scala_binary(
     name = "bin213",
     srcs = ["bin.scala"],  # compiled with 2.13 (as per `scala_version`)
     main_class = "C",
-    scala_version = "2.13.14",
+    scala_version = "2.13.15",
     deps = [
         ":lib",  # compiled 2.13 (as per `scala_version`)
         ":lib211",  # compiled with 2.11 (that target overrides version)
diff --git a/examples/crossbuild/3_select/BUILD b/examples/crossbuild/3_select/BUILD
index 314572089..c3a70479a 100644
--- a/examples/crossbuild/3_select/BUILD
+++ b/examples/crossbuild/3_select/BUILD
@@ -22,7 +22,7 @@ scala_binary(
     name = "bin2",
     srcs = ["bin.scala"],
     main_class = "B",
-    scala_version = "2.13.14",
+    scala_version = "2.13.15",
     deps = [":lib"],
 )
 
@@ -30,6 +30,6 @@ scala_binary(
     name = "bin3",
     srcs = ["bin.scala"],
     main_class = "B",
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
     deps = [":lib"],
 )
diff --git a/examples/crossbuild/WORKSPACE b/examples/crossbuild/WORKSPACE
index 2d0e286a8..8e7883e9b 100644
--- a/examples/crossbuild/WORKSPACE
+++ b/examples/crossbuild/WORKSPACE
@@ -30,11 +30,11 @@ local_repository(
 load("@io_bazel_rules_scala//:scala_config.bzl", "scala_config")
 
 scala_config(
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
     scala_versions = [
         "2.11.12",
-        "2.13.14",
-        "3.3.3",
+        "2.13.15",
+        "3.3.4",
     ],
 )
 
diff --git a/examples/scala3/WORKSPACE b/examples/scala3/WORKSPACE
index 2e02cad76..fee68888c 100644
--- a/examples/scala3/WORKSPACE
+++ b/examples/scala3/WORKSPACE
@@ -29,7 +29,7 @@ local_repository(
 
 load("@io_bazel_rules_scala//:scala_config.bzl", "scala_config")
 
-scala_config(scala_version = "3.5.0")
+scala_config(scala_version = "3.5.2")
 
 load(
     "@io_bazel_rules_scala//scala:scala.bzl",
diff --git a/examples/semanticdb/WORKSPACE b/examples/semanticdb/WORKSPACE
index 456f76248..a006e5e94 100644
--- a/examples/semanticdb/WORKSPACE
+++ b/examples/semanticdb/WORKSPACE
@@ -32,7 +32,7 @@ local_repository(
 
 load("@io_bazel_rules_scala//:scala_config.bzl", "scala_config")
 
-scala_config(scala_version = "2.13.14")
+scala_config(scala_version = "2.13.15")
 
 load(
     "@io_bazel_rules_scala//scala:scala.bzl",
diff --git a/scala_config.bzl b/scala_config.bzl
index 3bc114775..70cf132c3 100644
--- a/scala_config.bzl
+++ b/scala_config.bzl
@@ -2,7 +2,7 @@ load("//scala:scala_cross_version.bzl", "extract_major_version", "extract_minor_
 
 def _default_scala_version():
     """return the scala version for use in maven coordinates"""
-    return "2.12.19"
+    return "2.12.20"
 
 def _validate_supported_scala_version(scala_major_version, scala_minor_version):
     if scala_major_version == "2.11" and int(scala_minor_version) != 12:
diff --git a/test/shell/test_coverage_equals_in_target.sh b/test/shell/test_coverage_equals_in_target.sh
index 2f37fa8e8..3dd3919e5 100755
--- a/test/shell/test_coverage_equals_in_target.sh
+++ b/test/shell/test_coverage_equals_in_target.sh
@@ -4,8 +4,8 @@ dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 . "${dir}"/test_helper.sh
 runner=$(get_test_runner "${1:-local}")
 
-# Default to 2.12.19 for `diff` tests because other versions change the output.
-SCALA_VERSION="${SCALA_VERSION:-2.12.19}"
+# Default to 2.12.20 for `diff` tests because other versions change the output.
+SCALA_VERSION="${SCALA_VERSION:-2.12.20}"
 
 test_coverage_target_name_contains_equals_sign() {
     bazel coverage \
diff --git a/test/shell/test_coverage_scalatest.sh b/test/shell/test_coverage_scalatest.sh
index e29b6adc2..f154dbb0d 100755
--- a/test/shell/test_coverage_scalatest.sh
+++ b/test/shell/test_coverage_scalatest.sh
@@ -4,8 +4,8 @@ dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 . "${dir}"/test_helper.sh
 runner=$(get_test_runner "${1:-local}")
 
-# Default to 2.12.19 for `diff` tests because other versions change the output.
-SCALA_VERSION="${SCALA_VERSION:-2.12.19}"
+# Default to 2.12.20 for `diff` tests because other versions change the output.
+SCALA_VERSION="${SCALA_VERSION:-2.12.20}"
 
 test_coverage_on() {
     bazel coverage \
diff --git a/test/shell/test_coverage_scalatest_resources.sh b/test/shell/test_coverage_scalatest_resources.sh
index 08bb38b74..0df3494ae 100755
--- a/test/shell/test_coverage_scalatest_resources.sh
+++ b/test/shell/test_coverage_scalatest_resources.sh
@@ -4,8 +4,8 @@ dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 . "${dir}"/test_helper.sh
 runner=$(get_test_runner "${1:-local}")
 
-# Default to 2.12.19 for `diff` tests because other versions change the output.
-SCALA_VERSION="${SCALA_VERSION:-2.12.19}"
+# Default to 2.12.20 for `diff` tests because other versions change the output.
+SCALA_VERSION="${SCALA_VERSION:-2.12.20}"
 
 test_coverage_succeeds_resource_call() {
     bazel coverage \
diff --git a/test/shell/test_coverage_specs2_with_junit.sh b/test/shell/test_coverage_specs2_with_junit.sh
index 725eecccd..940e00a3f 100755
--- a/test/shell/test_coverage_specs2_with_junit.sh
+++ b/test/shell/test_coverage_specs2_with_junit.sh
@@ -4,8 +4,8 @@ dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 . "${dir}"/test_helper.sh
 runner=$(get_test_runner "${1:-local}")
 
-# Default to 2.12.19 for `diff` tests because other versions change the output.
-SCALA_VERSION="${SCALA_VERSION:-2.12.19}"
+# Default to 2.12.20 for `diff` tests because other versions change the output.
+SCALA_VERSION="${SCALA_VERSION:-2.12.20}"
 
 test_coverage_on() {
     bazel coverage \
diff --git a/test/shell/test_examples.sh b/test/shell/test_examples.sh
index d77568316..e485532cd 100755
--- a/test/shell/test_examples.sh
+++ b/test/shell/test_examples.sh
@@ -38,7 +38,7 @@ function scala3_2_example() {
 }
 
 function scala3_3_example() {
-  test_example examples/scala3 "bazel build --repo_env=SCALA_VERSION=3.3.3 //..."
+  test_example examples/scala3 "bazel build --repo_env=SCALA_VERSION=3.3.4 //..."
 }
 
 function scala3_4_example() {
@@ -46,7 +46,7 @@ function scala3_4_example() {
  }
 
 function scala3_5_example() {
-   test_example examples/scala3 "bazel build --repo_env=SCALA_VERSION=3.5.0 //..."
+   test_example examples/scala3 "bazel build --repo_env=SCALA_VERSION=3.5.2 //..."
  }
 
 function semanticdb_example() {
diff --git a/test/shell/test_invalid_scalacopts.sh b/test/shell/test_invalid_scalacopts.sh
index 7108de058..eadd2293f 100755
--- a/test/shell/test_invalid_scalacopts.sh
+++ b/test/shell/test_invalid_scalacopts.sh
@@ -25,7 +25,7 @@ test_logs_not_contains() {
    2>&1 | grep -v "$expected"
 }
 
-for scalaVersion in 2.12.19 2.13.14 3.3.3; do
+for scalaVersion in 2.12.20 2.13.15 3.3.4; do
   if [[ "$scalaVersion" == 3.* ]]; then
     $runner test_logs_contains $scalaVersion "not-existing is not a valid choice for -source"
   else
diff --git a/test/shell/test_scala_config.sh b/test/shell/test_scala_config.sh
index 4be645e58..ab17f661d 100755
--- a/test/shell/test_scala_config.sh
+++ b/test/shell/test_scala_config.sh
@@ -6,13 +6,13 @@ runner=$(get_test_runner "${1:-local}")
 
 test_classpath_contains_2_12() {
   bazel aquery 'mnemonic("Javac", //src/java/io/bazel/rulesscala/scalac:scalac)' \
-   --repo_env=SCALA_VERSION=2.12.19 \
+   --repo_env=SCALA_VERSION=2.12.20 \
    | grep scala-library-2.12
 }
 
 test_classpath_contains_2_13() {
   bazel aquery 'mnemonic("Javac", //src/java/io/bazel/rulesscala/scalac:scalac)' \
-   --repo_env=SCALA_VERSION=2.13.14 \
+   --repo_env=SCALA_VERSION=2.13.15 \
    | grep scala-library-2.13
 }
 
diff --git a/test/shell/test_semanticdb.sh b/test/shell/test_semanticdb.sh
index 89947160e..6adffc448 100755
--- a/test/shell/test_semanticdb.sh
+++ b/test/shell/test_semanticdb.sh
@@ -30,7 +30,7 @@ test_produces_semanticdb(){
   fi
 
   if [ $scala_majver -eq 3 ]; then
-    local version_opt="--repo_env=SCALA_VERSION=3.3.3"
+    local version_opt="--repo_env=SCALA_VERSION=3.3.4"
   fi
 
 
diff --git a/test_cross_build/WORKSPACE b/test_cross_build/WORKSPACE
index cb3f9d338..445e5de00 100644
--- a/test_cross_build/WORKSPACE
+++ b/test_cross_build/WORKSPACE
@@ -63,11 +63,11 @@ scala_config(
     scala_version = "3.1.3",
     scala_versions = [
         "2.11.12",
-        "2.12.19",
-        "2.13.14",
+        "2.12.20",
+        "2.13.15",
         "3.1.3",
         "3.2.2",
-        "3.3.3",
+        "3.3.4",
     ],
 )
 
diff --git a/test_cross_build/scalafmt/BUILD b/test_cross_build/scalafmt/BUILD
index 586619277..802c8481b 100644
--- a/test_cross_build/scalafmt/BUILD
+++ b/test_cross_build/scalafmt/BUILD
@@ -20,7 +20,7 @@ scalafmt_scala_library(
     srcs = ["unformatted/unformatted-library2.scala"],
     config = ":scala2-conf",
     format = True,
-    scala_version = "2.13.14",
+    scala_version = "2.13.15",
 )
 
 scalafmt_scala_library(
@@ -28,7 +28,7 @@ scalafmt_scala_library(
     srcs = ["formatted/formatted-library2.scala"],
     config = ":scala2-conf",
     format = True,
-    scala_version = "2.13.14",
+    scala_version = "2.13.15",
 )
 
 scalafmt_scala_library(
@@ -36,7 +36,7 @@ scalafmt_scala_library(
     srcs = ["unformatted/unformatted-library3.scala"],
     config = ":scala3-conf",
     format = True,
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
 )
 
 scalafmt_scala_library(
@@ -44,7 +44,7 @@ scalafmt_scala_library(
     srcs = ["formatted/formatted-library3.scala"],
     config = ":scala3-conf",
     format = True,
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
 )
 
 scalafmt_scala_binary(
@@ -53,7 +53,7 @@ scalafmt_scala_binary(
     config = ":scala2-conf",
     format = True,
     main_class = "UnformattedBinary",
-    scala_version = "2.12.19",
+    scala_version = "2.12.20",
 )
 
 scalafmt_scala_library(
@@ -62,7 +62,7 @@ scalafmt_scala_library(
     config = ":scala2-conf",
     format = True,
     main_class = "UnformattedBinary",
-    scala_version = "2.12.19",
+    scala_version = "2.12.20",
 )
 
 scalafmt_scala_binary(
@@ -88,7 +88,7 @@ scalafmt_scala_test(
     srcs = ["unformatted/unformatted-test2.scala"],
     config = ":scala2-conf",
     format = True,
-    scala_version = "2.12.19",
+    scala_version = "2.12.20",
 )
 
 scalafmt_scala_test(
@@ -96,7 +96,7 @@ scalafmt_scala_test(
     srcs = ["formatted/formatted-test2.scala"],
     config = ":scala2-conf",
     format = True,
-    scala_version = "2.12.19",
+    scala_version = "2.12.20",
 )
 
 #default scala version is 3.1.3
diff --git a/test_cross_build/version_specific/BUILD b/test_cross_build/version_specific/BUILD
index e9401a760..4eb341972 100644
--- a/test_cross_build/version_specific/BUILD
+++ b/test_cross_build/version_specific/BUILD
@@ -7,7 +7,7 @@ load("@io_bazel_rules_scala//scala:scala.bzl", "scala_library")
 scala_library(
     name = "since_3_3",
     srcs = ["since_3_3.scala"],
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
 )
 
 scala_library(
@@ -43,7 +43,7 @@ scala_library(
         "since_3_2.scala",
         "since_3_3.scala",
     ],
-    scala_version = "3.3.3",
+    scala_version = "3.3.4",
 )
 
 scala_library(
diff --git a/test_version.sh b/test_version.sh
index cd4a60ec4..8babe29db 100755
--- a/test_version.sh
+++ b/test_version.sh
@@ -3,8 +3,8 @@
 set -e
 
 scala_2_11_version="2.11.12"
-scala_2_12_version="2.12.19"
-scala_2_13_version="2.13.14"
+scala_2_12_version="2.12.20"
+scala_2_13_version="2.13.15"
 
 SCALA_VERSION_DEFAULT=$scala_2_11_version