diff --git a/build.gradle b/build.gradle
index c2b6a35..b334466 100644
--- a/build.gradle
+++ b/build.gradle
@@ -27,7 +27,7 @@ configurations {
 
 ext {
     versions = [
-        checkerFramework: "3.42.0-eisop5",
+        checkerFramework: "3.49.3-eisop1",
         errorproneJavacVersion: "9+181-r4173-1",
         errorproneCoreVersion: "2.40.0",
     ]
diff --git a/crypto-checker-qual-android/build.gradle b/crypto-checker-qual-android/build.gradle
index 4d7f5e3..495734c 100644
--- a/crypto-checker-qual-android/build.gradle
+++ b/crypto-checker-qual-android/build.gradle
@@ -7,7 +7,7 @@ repositories {
 }
 
 ext.versions = [
-    checkerFramework: "3.42.0-eisop5",
+    checkerFramework: "3.49.3-eisop1",
 ]
 
 dependencies {
diff --git a/crypto-checker-qual/build.gradle b/crypto-checker-qual/build.gradle
index dc35c22..ccdca62 100644
--- a/crypto-checker-qual/build.gradle
+++ b/crypto-checker-qual/build.gradle
@@ -7,7 +7,7 @@ repositories {
 }
 
 ext.versions = [
-    checkerFramework: "3.42.0-eisop5",
+    checkerFramework: "3.49.3-eisop1",
 ]
 
 dependencies {
diff --git a/src/main/java/org/checkerframework/checker/crypto/CryptoChecker.java b/src/main/java/org/checkerframework/checker/crypto/CryptoChecker.java
index 9996f84..51e55d9 100644
--- a/src/main/java/org/checkerframework/checker/crypto/CryptoChecker.java
+++ b/src/main/java/org/checkerframework/checker/crypto/CryptoChecker.java
@@ -2,6 +2,7 @@
 
 import org.checkerframework.common.basetype.BaseTypeChecker;
 import org.checkerframework.common.value.ValueChecker;
+import org.checkerframework.framework.source.SourceChecker;
 import org.checkerframework.framework.source.SupportedLintOptions;
 
 import java.util.Set;
@@ -10,8 +11,8 @@
 public class CryptoChecker extends BaseTypeChecker {
 
     @Override
-    protected Set<Class<? extends BaseTypeChecker>> getImmediateSubcheckerClasses() {
-        Set<Class<? extends BaseTypeChecker>> checkers = super.getImmediateSubcheckerClasses();
+    protected Set<Class<? extends SourceChecker>> getImmediateSubcheckerClasses() {
+        Set<Class<? extends SourceChecker>> checkers = super.getImmediateSubcheckerClasses();
         checkers.add(ValueChecker.class);
         return checkers;
     }