diff --git a/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2AuthorizationCode.java b/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2AuthorizationCode.java
index 60b0f8a368..4c2de06b2e 100644
--- a/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2AuthorizationCode.java
+++ b/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2AuthorizationCode.java
@@ -142,9 +142,9 @@ public class OAuth2AuthorizationCode extends APIConnection implements UpdatableC
                     Object expiresInResponse = mappedResponse.get(Authentication.EXPIRES_IN);
                     Instant expiresAt = null;
                     if (expiresAtResponse != null) {
-                        expiresAt = Instant.ofEpochSecond(Long.valueOf((Integer) expiresAtResponse));
+                        expiresAt = Instant.ofEpochSecond(Long.parseLong(String.valueOf(expiresAtResponse)));
                     } else if (expiresInResponse != null) {
-                        expiresAt = issuedAt.plusSeconds(Long.valueOf((Integer) expiresInResponse));
+                        expiresAt = issuedAt.plusSeconds(Long.parseLong(String.valueOf(expiresInResponse)));
                     }
                     authenticationResponse.setExpiresAt(expiresAt);
                     authenticationResponse.setIssuedAt(issuedAt);
diff --git a/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2ClientCredentials.java b/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2ClientCredentials.java
index 7ab38c825e..542936096e 100644
--- a/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2ClientCredentials.java
+++ b/app/server/appsmith-plugins/restApiPlugin/src/main/java/com/external/connections/OAuth2ClientCredentials.java
@@ -111,9 +111,9 @@ public class OAuth2ClientCredentials extends APIConnection implements UpdatableC
                     Object expiresInResponse = mappedResponse.get(Authentication.EXPIRES_IN);
                     Instant expiresAt = null;
                     if (expiresAtResponse != null) {
-                        expiresAt = Instant.ofEpochSecond(Long.parseLong((String) expiresAtResponse));
+                        expiresAt = Instant.ofEpochSecond(Long.parseLong(String.valueOf(expiresAtResponse)));
                     } else if (expiresInResponse != null) {
-                        expiresAt = issuedAt.plusSeconds(Long.valueOf((Integer) expiresInResponse));
+                        expiresAt = issuedAt.plusSeconds(Long.parseLong(String.valueOf(expiresInResponse)));
                     }
                     authenticationResponse.setExpiresAt(expiresAt);
                     authenticationResponse.setIssuedAt(issuedAt);
diff --git a/app/server/appsmith-server/src/main/java/com/appsmith/server/solutions/ce/AuthenticationServiceCEImpl.java b/app/server/appsmith-server/src/main/java/com/appsmith/server/solutions/ce/AuthenticationServiceCEImpl.java
index ca06edb7f7..c69441dbe6 100644
--- a/app/server/appsmith-server/src/main/java/com/appsmith/server/solutions/ce/AuthenticationServiceCEImpl.java
+++ b/app/server/appsmith-server/src/main/java/com/appsmith/server/solutions/ce/AuthenticationServiceCEImpl.java
@@ -230,9 +230,9 @@ public class AuthenticationServiceCEImpl implements AuthenticationServiceCE {
                                 Object expiresInResponse = response.get(Authentication.EXPIRES_IN);
                                 Instant expiresAt = null;
                                 if (expiresAtResponse != null) {
-                                    expiresAt = Instant.ofEpochSecond(Long.valueOf((Integer) expiresAtResponse));
+                                    expiresAt = Instant.ofEpochSecond(Long.parseLong(String.valueOf(expiresAtResponse)));
                                 } else if (expiresInResponse != null) {
-                                    expiresAt = issuedAt.plusSeconds(Long.parseLong((String) expiresInResponse));
+                                    expiresAt = issuedAt.plusSeconds(Long.parseLong(String.valueOf(expiresInResponse)));
                                 }
                                 authenticationResponse.setExpiresAt(expiresAt);
                                 // Replacing with returned scope instead