diff --git a/scala/private/phases/phase_compile.bzl b/scala/private/phases/phase_compile.bzl
index 7b78abefa..c1df0ada9 100644
--- a/scala/private/phases/phase_compile.bzl
+++ b/scala/private/phases/phase_compile.bzl
@@ -262,7 +262,10 @@ def _compile_or_empty(
         )
 
 def _build_ijar(ctx):
-    if ctx.toolchains["@io_bazel_rules_scala//scala:toolchain_type"].scala_version.startswith("2."):
+    scala_version = ctx.toolchains["@io_bazel_rules_scala//scala:toolchain_type"].scala_version
+    is_scala_2 = scala_version.startswith("2.")
+
+    if is_scala_2:
         return java_common.run_ijar(
             ctx.actions,
             jar = ctx.outputs.jar,
@@ -270,6 +273,14 @@ def _build_ijar(ctx):
             java_toolchain = specified_java_compile_toolchain(ctx),
         )
 
+    is_scala_3_3_or_lower = scala_version.startswith("3.") and int(scala_version.split(".")[1]) < 4
+
+    # Prior to Scala v3.4.0, TASTy files couldn't be read directly without a `.class` file present and its
+    # "TASTY" attributes preserved:
+    # https://github.com/scala/scala3/pull/17594
+    if is_scala_3_3_or_lower:
+        return ctx.outputs.jar
+
     output = ctx.actions.declare_file("{}-ijar.jar".format(ctx.label.name))
     arguments = ctx.actions.args()
     arguments.add(ctx.outputs.jar)
diff --git a/scripts/create_repository.py b/scripts/create_repository.py
index 2c6463886..8931096c1 100755
--- a/scripts/create_repository.py
+++ b/scripts/create_repository.py
@@ -93,7 +93,9 @@ def select_root_artifacts(scala_version, scala_major, is_scala_3) -> List[str]:
         protoc_bridge_version = '0.7.14'
 
     if is_scala_3:
-        specs2_version = '4.20.9'
+        # Versions greater than v4.20.0 depend on a version of the Scala standard library greater than v3.1.3. This is a
+        # problem because Scala v3.1.3, which we support, needs to use a matching version of the Scala standard library.
+        specs2_version = '4.20.0'
     elif scala_major == '2.11':
         specs2_version = '4.10.6'
     else:
@@ -129,7 +131,10 @@ def select_root_artifacts(scala_version, scala_major, is_scala_3) -> List[str]:
 
     if is_scala_3:
         root_artifacts.extend([
-            'dev.zio:izumi-reflect_3:2.3.10',
+            # Versions of izumi-reflect greater than v2.2.1 depend on a version of the Scala standard library greater
+            # than v3.1.3. This is a problem because Scala v3.1.3, which we support, needs to use a matching version of
+            # the Scala standard library.
+            'dev.zio:izumi-reflect_3:2.2.1',
             f'org.jline:jline-reader:{JLINE_VERSION}',
             f'org.jline:jline-terminal:{JLINE_VERSION}',
             f'org.jline:jline-terminal-jna:{JLINE_VERSION}',
diff --git a/third_party/repositories/scala_3_1.bzl b/third_party/repositories/scala_3_1.bzl
index 8c25710aa..a538969f9 100644
--- a/third_party/repositories/scala_3_1.bzl
+++ b/third_party/repositories/scala_3_1.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -258,8 +258,8 @@ artifacts = {
         "sha256": "dca9bcd395deffca77c1d3919b4cc998234025059a892b10c3674c9a37d6dc9f",
     },
     "io_bazel_rules_scala_scala_library": {
-        "artifact": "org.scala-lang:scala3-library_3:3.3.3",
-        "sha256": "16fe064f1373ed6f098d3d9f812a398ed5075db4bf2721c04e630502cb352816",
+        "artifact": "org.scala-lang:scala3-library_3:3.1.3",
+        "sha256": "1ac79970d94a1762ce6af4208820b4fa4c70093409decaad85c69d8b5f46e422",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
@@ -301,8 +301,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -525,8 +525,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
diff --git a/third_party/repositories/scala_3_2.bzl b/third_party/repositories/scala_3_2.bzl
index 6b09e8b36..6b3a3796f 100644
--- a/third_party/repositories/scala_3_2.bzl
+++ b/third_party/repositories/scala_3_2.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -258,8 +258,8 @@ artifacts = {
         "sha256": "f07bab6250d718613f0f8250cc61cc23217c4fd84c410c3af43b8098fff31f69",
     },
     "io_bazel_rules_scala_scala_library": {
-        "artifact": "org.scala-lang:scala3-library_3:3.3.3",
-        "sha256": "16fe064f1373ed6f098d3d9f812a398ed5075db4bf2721c04e630502cb352816",
+        "artifact": "org.scala-lang:scala3-library_3:3.2.2",
+        "sha256": "f96317c57a5beae2cb16607d2b99cba7b136a96416e736966e5955e6608d868b",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
@@ -301,8 +301,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -525,8 +525,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
diff --git a/third_party/repositories/scala_3_3.bzl b/third_party/repositories/scala_3_3.bzl
index bd8f61258..693016775 100644
--- a/third_party/repositories/scala_3_3.bzl
+++ b/third_party/repositories/scala_3_3.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -302,8 +302,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -526,8 +526,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
diff --git a/third_party/repositories/scala_3_4.bzl b/third_party/repositories/scala_3_4.bzl
index 659852c94..8ab050088 100644
--- a/third_party/repositories/scala_3_4.bzl
+++ b/third_party/repositories/scala_3_4.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -302,8 +302,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -526,8 +526,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
diff --git a/third_party/repositories/scala_3_5.bzl b/third_party/repositories/scala_3_5.bzl
index d693476ee..28a69ce24 100644
--- a/third_party/repositories/scala_3_5.bzl
+++ b/third_party/repositories/scala_3_5.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -302,8 +302,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -526,8 +526,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],
diff --git a/third_party/repositories/scala_3_6.bzl b/third_party/repositories/scala_3_6.bzl
index b2b2ab086..d6456808b 100644
--- a/third_party/repositories/scala_3_6.bzl
+++ b/third_party/repositories/scala_3_6.bzl
@@ -133,16 +133,16 @@ artifacts = {
         "sha256": "6d18fe25aa30b7e08b908cd21151d8f96e22965c640acd7751add9bbfe6137d4",
     },
     "dev_zio_izumi_reflect": {
-        "artifact": "dev.zio:izumi-reflect_3:2.3.10",
-        "sha256": "9f4e23968f00eaea2132337b94faa9e52cc7f159cce319c2f112c36d2c29d55d",
+        "artifact": "dev.zio:izumi-reflect_3:2.2.1",
+        "sha256": "1228bff91fa585b227427b3b8b93bffaf64b22727ea6a2c160476f00434d3a10",
         "deps": [
             "@dev_zio_izumi_reflect_thirdparty_boopickle_shaded",
             "@io_bazel_rules_scala_scala_library",
         ],
     },
     "dev_zio_izumi_reflect_thirdparty_boopickle_shaded": {
-        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.3.10",
-        "sha256": "3c36e0e0c6bc18f5c1a0ffbf820c3783b472690afc56105e9c7c8b81357b5661",
+        "artifact": "dev.zio:izumi-reflect-thirdparty-boopickle-shaded_3:2.2.1",
+        "sha256": "34c34cbf4c18f725ba3860bc9f09dfeaee13430cccc72711cbac711bb379b290",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -311,8 +311,8 @@ artifacts = {
         ],
     },
     "io_bazel_rules_scala_scala_xml": {
-        "artifact": "org.scala-lang.modules:scala-xml_3:2.3.0",
-        "sha256": "3220723238102107ab83182468e5dbe351b081a0601386710ef46c81a95d38d0",
+        "artifact": "org.scala-lang.modules:scala-xml_3:2.1.0",
+        "sha256": "48f22343575f4b1d6550eecc42d4b7f0a0d30223c72f015d8d893feab4cbeecd",
         "deps": [
             "@io_bazel_rules_scala_scala_library",
         ],
@@ -535,8 +535,8 @@ artifacts = {
         ],
     },
     "org_portable_scala_portable_scala_reflect": {
-        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.3",
-        "sha256": "920f62979293069cf721865f931e42f9f7b0b2720ee9f6a9ddff76a19ecf8d4e",
+        "artifact": "org.portable-scala:portable-scala-reflect_2.13:1.1.1",
+        "sha256": "11f2f59d0c228912811095025b36ce58a025a8397851d773295c8ad7862d8488",
         "deps": [
             "@io_bazel_rules_scala_scala_library_2",
         ],