diff --git a/sigstore-java/build.gradle.kts b/sigstore-java/build.gradle.kts
index 1bdd6807..b99bfc4f 100644
--- a/sigstore-java/build.gradle.kts
+++ b/sigstore-java/build.gradle.kts
@@ -37,8 +37,8 @@ dependencies {
 
     implementation("commons-codec:commons-codec:1.15")
     implementation("com.google.code.gson:gson:2.10.1")
-    implementation("org.bouncycastle:bcutil-jdk18on:1.72")
-    implementation("org.bouncycastle:bcpkix-jdk18on:1.72")
+    implementation("org.bouncycastle:bcutil-jdk18on:1.73")
+    implementation("org.bouncycastle:bcpkix-jdk18on:1.73")
 
     implementation(platform("com.google.oauth-client:google-oauth-client-bom:1.34.1"))
     implementation("com.google.oauth-client:google-oauth-client")