diff --git a/java/ql/lib/ext/com.mongodb.model.yml b/java/ql/lib/ext/com.mongodb.model.yml
index 4f1acc67f0014..afb3f232faa04 100644
--- a/java/ql/lib/ext/com.mongodb.model.yml
+++ b/java/ql/lib/ext/com.mongodb.model.yml
@@ -3,13 +3,13 @@ extensions:
       pack: codeql/java-all
       extensible: sinkModel
     data:
-      - ["com.mongodb", "MongoCredential", False, "createCredential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createCredential", "", "", "Argument[2]", "credentials-password", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createGSSAPICredential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createMongoCRCredential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createMongoCRCredential", "", "", "Argument[2]", "credentials-password", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createMongoX509Credential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createPlainCredential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createPlainCredential", "", "", "Argument[2]", "credentials-password", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createScramSha1Credential", "", "", "Argument[0]", "credentials-username", "manual"]
-      - ["com.mongodb", "MongoCredential", False, "createScramSha1Credential", "", "", "Argument[2]", "credentials-password", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createCredential", "(String,String,char[])", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createCredential", "(String,String,char[])", "", "Argument[2]", "credentials-password", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createGSSAPICredential", "(String)", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createMongoCRCredential", "(String,String,char[])", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createMongoCRCredential", "(String,String,char[])", "", "Argument[2]", "credentials-password", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createMongoX509Credential", "(String)", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createPlainCredential", "(String,String,char[])", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createPlainCredential", "(String,String,char[])", "", "Argument[2]", "credentials-password", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createScramSha1Credential", "(String,String,char[])", "", "Argument[0]", "credentials-username", "manual"]
+      - ["com.mongodb", "MongoCredential", False, "createScramSha1Credential", "(String,String,char[])", "", "Argument[2]", "credentials-password", "manual"]
diff --git a/java/ql/lib/ext/java.security.cert.model.yml b/java/ql/lib/ext/java.security.cert.model.yml
index f7bcc5221d006..e83168078839c 100644
--- a/java/ql/lib/ext/java.security.cert.model.yml
+++ b/java/ql/lib/ext/java.security.cert.model.yml
@@ -3,4 +3,4 @@ extensions:
       pack: codeql/java-all
       extensible: sinkModel
     data:
-      - ["java.security.cert", "X509CertSelector", False, "setSubjectPublicKey", "", "", "Argument[0]", "credentials-key", "hq-generated"]
+      - ["java.security.cert", "X509CertSelector", False, "setSubjectPublicKey", "(byte[])", "", "Argument[0]", "credentials-key", "hq-generated"]