diff --git a/.github/workflows/release-runtime-interface-client.yml b/.github/workflows/release-runtime-interface-client.yml
index eb48b752..49c3f8d5 100644
--- a/.github/workflows/release-runtime-interface-client.yml
+++ b/.github/workflows/release-runtime-interface-client.yml
@@ -55,10 +55,10 @@ jobs:
         include:
           - arch: x86_64
             runner: codebuild-aws-lambda-java-libs-test-trigger-x86-${{ github.run_id }}-${{ github.run_attempt }}
-            profiles: linux-x86_64
+            profiles: linux-x86_64 linux_musl-x86_64
           - arch: aarch64
             runner: codebuild-aws-lambda-java-libs-test-trigger-arm64-${{ github.run_id }}-${{ github.run_attempt }}
-            profiles: linux-aarch64
+            profiles: linux-aarch64 linux_musl-aarch64
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 45
     steps:
@@ -243,7 +243,7 @@ jobs:
       - name: Run tests
         env:
           IS_JAVA_8: true
-        run: mvn test --file "$MODULE/pom.xml"
+        run: mvn test -DargLineForReflectionTestOnly="" --file "$MODULE/pom.xml"
 
       # JARs to attach + .so files for the fat main JAR.
       - name: Download native artifacts
diff --git a/aws-lambda-java-runtime-interface-client/pom.xml b/aws-lambda-java-runtime-interface-client/pom.xml
index c76f3761..6db41aa3 100644
--- a/aws-lambda-java-runtime-interface-client/pom.xml
+++ b/aws-lambda-java-runtime-interface-client/pom.xml
@@ -442,9 +442,16 @@
                                             <type>jar</type>
                                             <classifier>linux-aarch_64</classifier>
                                         </artifact>
-                                        <!-- linux_musl (Alpine) classifiers temporarily disabled for
-                                             testing: the egress-locked release runner can't reach the
-                                             Alpine apk mirrors to build the musl .so. -->
+                                        <artifact>
+                                            <file>${project.build.directory}/${project.build.finalName}-linux_musl-x86_64.jar</file>
+                                            <type>jar</type>
+                                            <classifier>linux_musl-x86_64</classifier>
+                                        </artifact>
+                                        <artifact>
+                                            <file>${project.build.directory}/${project.build.finalName}-linux_musl-aarch_64.jar</file>
+                                            <type>jar</type>
+                                            <classifier>linux_musl-aarch_64</classifier>
+                                        </artifact>
                                     </artifacts>
                                 </configuration>
                             </execution>
diff --git a/aws-lambda-java-runtime-interface-client/src/main/jni/build-jni-lib.sh b/aws-lambda-java-runtime-interface-client/src/main/jni/build-jni-lib.sh
index 82e49d56..44a290b6 100755
--- a/aws-lambda-java-runtime-interface-client/src/main/jni/build-jni-lib.sh
+++ b/aws-lambda-java-runtime-interface-client/src/main/jni/build-jni-lib.sh
@@ -116,9 +116,7 @@ if [ -n "$BUILD_OS" ] && [ -n "$BUILD_ARCH" ]; then
 else
   # build for all architectures and libc implementations
   declare -a ARCHITECTURES=("x86_64" "aarch_64")
-  # musl (Alpine) temporarily disabled for testing: the egress-locked release
-  # runner can't reach the Alpine apk mirrors. Re-add "musl" once that's solved.
-  declare -a LIBC_IMPLS=("glibc")
+  declare -a LIBC_IMPLS=("glibc" "musl")
 
   for arch in "${ARCHITECTURES[@]}"; do