diff --git a/.changeset/common-dancers-give.md b/.changeset/common-dancers-give.md
new file mode 100644
index 0000000..6a107bb
--- /dev/null
+++ b/.changeset/common-dancers-give.md
@@ -0,0 +1,5 @@
+---
+"evervault-android": minor
+---
+
+Upgrade bouncycastle dependency
diff --git a/evervault-core/build.gradle.kts b/evervault-core/build.gradle.kts
index 9dc7ff5..9aa2a94 100644
--- a/evervault-core/build.gradle.kts
+++ b/evervault-core/build.gradle.kts
@@ -95,7 +95,7 @@ dependencies {
     // ktor
     implementation("io.ktor:ktor-client-core:2.3.1")
     implementation("io.ktor:ktor-client-okhttp:2.3.1")
-    implementation("org.bouncycastle:bcprov-jdk15on:1.70")
+    implementation("org.bouncycastle:bcprov-jdk15to18:1.78.1")
 
     // JSON
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.1")